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Artículos de revistas sobre el tema "Electrons – Diffraction"

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Publicado: 4 de junio de 2021

Última modificación: 9 de junio de 2025

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1

Qin, L. C., A. J. Garratt-Reed, and L. W. Hobbs. "Theory and practice of energy-filtered electron diffraction using the HB5 STEM." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 1 (August 1992): 350–51. http://dx.doi.org/10.1017/s0424820100122150.

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Electron diffraction patterns obtained in TEM have long been an important part of microstructural characterizations. Certain materials, such as crystalline silicas, are amorphized in the fast electron beam of the TEM, and their aperiodic (metamict) structure is of interest. For amorphous materials, both elastically and inelastically scattered electrons contribute to the diffuse diffraction pattern. Analysis of aperiodic structure, however, requires intensity data from only elastically scattered electrons, and it is therefore it is necessary to obtain energy-filtered electron diffraction patter

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2

Lyman, Charles. "Diffraction." Microscopy Today 20, no. 2 (February 28, 2012): 7. http://dx.doi.org/10.1017/s1551929512000107.

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This year marks the 100th anniversary of the discovery of X-ray diffraction and the 85th anniversary of electron diffraction (see Microscopy Pioneers). For most of the time since their introduction, microscopists have known these two techniques as the primary phase identification methods used in conjunction with various microscopies. However, these two diffraction methods also have played enormous roles in understanding the structure of matter, as well as the nature of both X rays and electrons.

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3

Schröder, Rasmus R., and Christoph Burmester. "Improvements in electron diffraction of frozen hydrated crystals by energy filtering and large-area single-electron detection." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 666–67. http://dx.doi.org/10.1017/s0424820100149167.

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Diffraction patterns of 3D protein crystals embedded in vitrious ice are critical to record. Inelastically scattered electrons almost completely superimpose the diffraction pattern of crystals if the thickness of the crystal is higher than the mean free path of electrons in the specimen. Figure 1 shows such an example of an unfiltered electron diffraction pattern from a frozen hydrated 3D catalase crystal. However, for thin 2D crystals electron diffraction has been the state of the art method to determine the Fourier amplitudes for reconstructions to atomic level, and in one case the possibili

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4

Bauer, R., W. Probst, and W.I. Miller. "Elemental imaging of thin specimens with an energy filtering electron microscope (EFEM)." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 524–25. http://dx.doi.org/10.1017/s0424820100104686.

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In conventional TEM (CTEM), image contrast is determined by scattering absorption contrast, diffraction contrast and phase contrast. Phase contrast is produced by the interference of unscattered electrons and elastically scattered electrons. Scattering absorption contrast and diffraction contrast are produced by angle selection of the scattered electrons using an objective aperture diaphragm for brightfield, darkfield and diffraction images.In an EFEM, with an integrated imaging electron energy-loss spectrometer, angle selection is used as in CTEM, but, additionally, it is possible to perform

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5

Barckhaus, R. H., I. Fromm, H. J. Höhling, and L. Reimer. "Advantage of Electron Spectroscopic Diffraction on Calcified Tissue Sections." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (August 12, 1990): 362–63. http://dx.doi.org/10.1017/s0424820100135411.

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Different stages in the mineralization of calcified tissues can be investigated by electron diffraction. A disadvantage is the strong background below the Debye—Scherrer rings caused by the large massthickness of calcified products and the high ratio (≃ 3) of the inelastic—to—elastic scattering cross—sections of the embedding material. Therefore, a large fraction of the background consists of inelastically scattered electrons with energy losses. The electron spectroscopic diffraction (ESD) mode of an energy—filtering microscope (ZEISS EM902) allows to record diffraction patterns using only the

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6

VALERI, SERGIO, and ALESSANDRO di BONA. "MODULATED ELECTRON EMISSION BY SCATTERING-INTERFERENCE OF PRIMARY ELECTRONS." Surface Review and Letters 04, no. 01 (February 1997): 141–60. http://dx.doi.org/10.1142/s0218625x9700016x.

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We review the effects of scattering-interference of the primary, exciting beam on the electron emission from ordered atomic arrays. The yield of elastically and inelastically backscattered electrons, Auger electrons and secondary electrons shows a marked dependence on the incidence angle of primary electrons. Both the similarity and the relative importance of processes experienced by incident and excident electrons are discussed. We also present recent studies of electron focusing and defocusing along atomic chains. The interplay between these two processes determines the in-depth profile of t

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7

Yang, Jie, Markus Guehr, Theodore Vecchione, Matthew S. Robinson, Renkai Li, Nick Hartmann, Xiaozhe Shen, et al. "Femtosecond gas phase electron diffraction with MeV electrons." Faraday Discussions 194 (2016): 563–81. http://dx.doi.org/10.1039/c6fd00071a.

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We present results on ultrafast gas electron diffraction (UGED) experiments with femtosecond resolution using the MeV electron gun at SLAC National Accelerator Laboratory. UGED is a promising method to investigate molecular dynamics in the gas phase because electron pulses can probe the structure with a high spatial resolution. Until recently, however, it was not possible for UGED to reach the relevant timescale for the motion of the nuclei during a molecular reaction. Using MeV electron pulses has allowed us to overcome the main challenges in reaching femtosecond resolution, namely delivering

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8

Lynch, D. F., and A. E. Smith. "Electron diffraction phenomena for very low energy electrons." Acta Crystallographica Section A Foundations of Crystallography 43, a1 (August 12, 1987): C246. http://dx.doi.org/10.1107/s0108767387078887.

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9

Wang, Z. L. "Coupled thermal diffuse-atomic inner shell scattering in electron diffraction." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 994–95. http://dx.doi.org/10.1017/s042482010017270x.

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In electron diffraction patterns, diffuse scattering at high angles is primarily generated by phonon, or thermal diffuse, scattering (TDS). Techniques were introduced to acquire the electron energy-loss spectra (EELS) of high-angle thermal-diffuse-scattered electrons (TDS-EELS) in a transmission electron microscope (TEM). With regards to the scattering mechanism, the TDS-EELS core ionization edge intensity was believed to be generated primarily by TDS - single electron, double-inelastic electron scattering processes. It was concluded from experimental data that the signal from coupled phonon -

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10

Vincent, R. "Quantitative energy-filtered electron diffraction." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 992–93. http://dx.doi.org/10.1017/s0424820100172693.

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Microanalysis and diffraction on a sub-nanometre scale have become practical in modern TEMs due to the high brightness of field emission sources combined with the short mean free paths associated with both elastic and inelastic scattering of incident electrons by the specimen. However, development of electron diffraction as a quantitative discipline has been limited by the absence of any generalised theory for dynamical inelastic scattering. These problems have been simplified by recent innovations, principally the introduction of spectrometers such as the Gatan imaging filter (GIF) and the Ze

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11

Yao, Nan, and J. M. Cowley. "Acceleration voltage effect on electron surface channeling." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 530–31. http://dx.doi.org/10.1017/s0424820100154627.

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In transmission electron microscopy (TEM), the usable thickness of specimens increases with the incident electron energy. Some Bloch wave calculations of electron channelling along the zone axis in the transmission case show that the energy level for the channelled electrons increases (negatively) with the incident electron energy due to the correction for relativistic effect. Similarly, for reflection electron diffraction geometry, the faster the incident electrons, the deeper they penetrate into the surface. The diffraction patterns are expected to approach steadily to that for a three-dimen

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12

Moodie, A. F., and J. C. H. Spence. "John Maxwell Cowley 1923 - 2004." Historical Records of Australian Science 17, no. 2 (2006): 227. http://dx.doi.org/10.1071/hr06012.

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John Cowley contributed significantly to all of the fields that relate to electron diffraction and electron microscopy, and helped to found not a few of them. His name is associated in particular with n-beam dynamical theory, high-resolution electron microscopy, scanning transmission electron microscopy, instrumental design, and the application of the techniques of electron scattering to structure analysis. His experimental work was not, however, confined to the scattering of electrons: to take but one instance, his seminal work on the theory of short-range order was stimulated initially by hi

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13

Peng, L. M., and J. M. Cowley. "Reflection monolayer scattering and RHEED diffraction conditions." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 962–63. http://dx.doi.org/10.1017/s0424820100106879.

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In an infinite crystal, when the fast electrons are transmitted through the crystal, the effects of the periodic potential distribution on the incident electron wave can be best described by expanding the electron wavefunction in terms of propagating Bloch waves having the same periodicity as that of the crystal. The requirement for a three dimensional translation symmetry excludes the existence of evanescent Bloch waves with imaginary component of wave vector. With the presence of external surfaces, as in the case of reflection high energy electron diffraction (RHEED), the translation symmetr

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14

Issanova, M. K., S. K. Kodanova, T. S. Ramazanov, N. Kh Bastykova, Zh A. Moldabekov, and C. V. Meister. "Classical scattering and stopping power in dense plasmas: the effect of diffraction and dynamic screening." Laser and Particle Beams 34, no. 3 (June 27, 2016): 457–66. http://dx.doi.org/10.1017/s026303461600032x.

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AbstractIn the present work, classical electron–ion scattering, Coulomb logarithm, and stopping power are studied taking into account the quantum mechanical diffraction effect and the dynamic screening effect separately and together. The inclusion of the quantum diffraction effect is realized at the same level as the well-known first-order gradient correction in the extended Thomas–Fermi theory. In order to take the effect of dynamic screening into account, the model suggested by Grabowski et al. in 2013 is used. Scattering as well as stopping power of the external electron (ion) beam by plasm

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15

Komnik, Yu F., V. V. Andrievskii, and S. V. Rozhok. "Fine structure of the transverse electron focusing lines in bismuth. I. Quantum effects." Low Temperature Physics 22, no. 12 (December 1, 1996): 1066–75. https://doi.org/10.1063/10.0034160.

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It is shown that the fine structure of the transverse electron focusing (EF) line in a Bi crystal is determined by diffraction of the electron flow injected into the crystal through a point contact. The ballistic transport of electrons in the EF method preserves nonuniform angular distribution of electrons undergoing diffraction on the cyclotron trajectory. This distribution is manifested in the form of additional peaks against the background of the first EF line. The position of the peaks and their shift in the magnetic field upon a change in the electron energy correspond to the results of c

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16

Eades, Alwyn. "Insights on Diffraction." Microscopy Today 10, no. 2 (March 2002): 34–35. http://dx.doi.org/10.1017/s1551929500057874.

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This article presents ideas on some topics related to electron diffraction in the TEM. These are in regard to topics that I have come to think of as standard parts of what it means to do microscopy. However, they represent insights that not all users share (or even agree with, maybe).Kikuchi lines are of great use in orienting a sample. Unfortunately, in modern microscopes, Kikuchi lines are not seen in selected-area diffraction (SAD). This is because immersion lenses send parallel electrons, from different parts of the sample (like the Kikuchi lines from a flat specimen), to different places

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17

Ren, S. X., E. A. Kenik, K. B. Alexander, and A. Goyal. "Exploring Spatial Resolution in Electron Back-Scattered Diffraction Experiments via Monte Carlo Simulation." Microscopy and Microanalysis 4, no. 1 (February 1998): 15–22. http://dx.doi.org/10.1017/s1431927698980011.

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A Monte Carlo model was used to simulate specimen-electron beam interactions relevant to electron back-scattered diffraction (EBSD). Electron trajectories were calculated for a variety of likely experimental conditions to examine the interaction volume of the incident electrons as well as that of the subset of incident electrons that emerge from the specimen, i.e., back-scattered electrons (BSEs). The spatial resolution of EBSD was investigated as functions of both materials properties, such as atomic number, atomic weight, and density, and experimental parameters, such as specimen thickness,

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18

Latychevskaia, Tatiana. "Holography and Coherent Diffraction Imaging with Low-(30–250 eV) and High-(80–300 keV) Energy Electrons: History, Principles, and Recent Trends." Materials 13, no. 14 (July 10, 2020): 3089. http://dx.doi.org/10.3390/ma13143089.

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In this paper, we present the theoretical background to electron scattering in an atomic potential and the differences between low- and high-energy electrons interacting with matter. We discuss several interferometric techniques that can be realized with low- and high-energy electrons and which can be applied to the imaging of non-crystalline samples and individual macromolecules, including in-line holography, point projection microscopy, off-axis holography, and coherent diffraction imaging. The advantages of using low- and high-energy electrons for particular experiments are examined, and ex

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19

Mayer, J. "Electron spectroscopic imaging and diffraction: applications II materials science." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (August 1992): 1198–99. http://dx.doi.org/10.1017/s0424820100130626.

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With imaging energy filters becoming commercially available in transmission electron microscopy many of the limitations of conventional TEM instruments can be overcome. Energy filtered images of diffraction patterns can now be recorded without scanning using efficient parallel (2-dimensional detection. We have evaluated a prototype of the Zeiss EM 912 Omega, the first commercially available electron microscope with integrated imaging Omega energy filter. Combining the capabilities of the imaging spectrometer with the principal operation modes of a TEM gives access to many new qualitative and q

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20

Reimer, L. "Electron Spectroscopic Imaging and Diffraction in TEM." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (August 12, 1990): 66–67. http://dx.doi.org/10.1017/s0424820100133928.

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Energy-filtering electron microscopy at 80 keV (ZEISS EM902) offers the combination of electron spectroscopic imaging (ESI) and diffraction (ESD) and electron energy-loss spectroscopy (EELS). For details the reader is referred to a description of the different modes, applications of ESI to biological and crystalline specimens and of ESD. The very important mode of elemental mapping with the difference of ESI below and beyond an edge will not be discussed in this review.The ESI mode increases scattering contrast of stained and unstained biological sections and avoids chromatic aberration by zer

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21

Siebert, Alistair, Pedro Nunes, and Gwyndaf Evans. "HeXI: The High-energy Electron Xtallography Instrument at Diamond Light Source." Structural Dynamics 12, no. 2_Supplement (March 1, 2025): A23. https://doi.org/10.1063/4.0000332.

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The HeXI project, funded by the Wellcome Trust “Electrifying Life Sciences” grant and Diamond Light Source, aims to build a dedicated electron diffractometer to investigate the potential of Mega-electron volt (MeV) electrons for the determination of molecular structures from nanometre sized crystals. The HeXI instrument will leverage the increased penetration of MeV electrons and the high precision goniometry, cryo-sample transfer systems and sample preparation methods developed at Diamond to target crystal thicknesses between 300 nm and ∼1 μm to determine the molecular structures of proteins

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22

Slouf, Miroslav, Radim Skoupy, Ewa Pavlova, and Vladislav Krzyzanek. "Powder Nano-Beam Diffraction in Scanning Electron Microscope: Fast and Simple Method for Analysis of Nanoparticle Crystal Structure." Nanomaterials 11, no. 4 (April 9, 2021): 962. http://dx.doi.org/10.3390/nano11040962.

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We introduce a novel scanning electron microscopy (SEM) method which yields powder electron diffraction patterns. The only requirement is that the SEM microscope must be equipped with a pixelated detector of transmitted electrons. The pixelated detectors for SEM have been commercialized recently. They can be used routinely to collect a high number of electron diffraction patterns from individual nanocrystals and/or locations (this is called four-dimensional scanning transmission electron microscopy (4D-STEM), as we obtain two-dimensional (2D) information for each pixel of the 2D scanning array

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23

Völkl, E., L. F. Allard, B. Frost, and T. A. Nolan. "Quanitative aspects of electron diffraction using electron holography." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 616–17. http://dx.doi.org/10.1017/s0424820100139457.

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Off-axis electron holography has the well known ability to preserve the complex image wave within the final, recorded image. This final image described by I(x,y) = I(r) contains contributions from the image intensity of the elastically scattered electrons IeI (r) = |A(r) exp (iΦ(r)) |, the contributions from the inelastically scattered electrons IineI (r), and the complex image wave Ψ = A(r) exp(iΦ(r)) as:(1) I(r) = IeI (r) + Iinel (r) + μ A(r) cos(2π Δk r + Φ(r))where the constant μ describes the contrast of the interference fringes which are related to the spatial coherence of the electron b

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24

March, N. H., and M. P. Tosi. "Diffraction and transport in dense plasmas: Especially liquid metals." Laser and Particle Beams 16, no. 1 (March 1998): 71–81. http://dx.doi.org/10.1017/s0263034600011782.

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Recent computer experiments on liquid Mg and Bi (and also on dense hydrogen) have focussed anew on issues involving static and dynamical structure in plasmas. In Mg and Bi, under normal liquid metal conditions, separation of core and valence electrons is valuable both for thermodynamics and in interpreting diffraction experiments. Mg is considered in some detail as a specific example where there is weak electron–ion interaction. Finally, dynamical structure is considered. After a brief summary relating back to the electron–electron pair correlation contribution in X-ray scattering, attention i

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25

Katsap, Victor. "A novel thermionic crystal electron emission effect similar to Kikuchi lines." Journal of Vacuum Science & Technology B 41, no. 1 (January 2023): 010602. http://dx.doi.org/10.1116/6.0002375.

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Kikuchi lines, known since 1928 [S. Kikuchi, Jpn. J. Phys. 5, 83 (1928)], are generated by irradiating a crystal with high-energy e-beam in SEM or TEM and observing backscattered electrons diffraction on crystalline planes. The Kikuchi line effect gave rise to several useful tools in electron microscopy of crystalline and nanocrystalline materials [K. Saruwatari, et al., J. Mineral. Petrol. Sci. 103, 16 (2007)]. We have discovered a similar diffraction effect but of the crystal’ own thermally emitted electrons.

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26

Lehman, J. L., J. Mayer, and W. Probst. "Application of the Omega spectrometer TEM." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (August 1992): 1042–43. http://dx.doi.org/10.1017/s042482010012984x.

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The recent development of an analytical TEM with an integrated imaging Omega spectrometer has opened the door to a new world of specimen information. The Omega Spectrometer eliminates some of the information limits which have been imposed by the chromatic aberration effects in thick 3-D specimen imaging, as well as thermal diffuse and inelastic scattering in electron diffraction studies. This benefits both the TEM 3-D imaging and electron diffraction fields.Inelastically scattered electrons are electrons which have lost some of their energy while passing through the specimen. In all convention

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27

Fant, G. Y. "Multislice calculation of Kikuchi patterns." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 52–53. http://dx.doi.org/10.1017/s0424820100152239.

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The diffraction of the inelastically and pseudo-elastically scattered electrons in a crystal gives rise to the diffuse background in a diffraction pattern, including Kikuchi patterns as they are known, which are very sensitive to the direction of electron incidence relative to the crystal orientation. In the exact zone orientation, i.e., when the electrons are travelling along a major zone axis, a Kikuchi-band pattern is formed which reflects the crystal symmetry about that axis; otherwise, the pattern is known as Kikuchi-line pattern (thereafter collectively referred to as K-patterns).For loc

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28

Tivol, W. F., J. N. Turner, and D. L. Dorset. "Ab initio structure analysis of copper perbromophthalocyanine." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (August 1992): 1446–47. http://dx.doi.org/10.1017/s0424820100131863.

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The use of high-energy (1200 kV) electrons has been shown to be advantageous in the ab initio structure analysis from electron diffraction of organic compounds. Dynamical scattering from compounds containing heavy atoms may make such an analysis difficult or impossible with data obtained at conventional voltages. In the case that even high-energy electrons do not produce diffraction intensities sufficiently close to the kinematic values, criteria other than the simple minimization of the R-factor must be used to seek the correct structure solution.Copper perbromophthalocyanine (Cu-BrPTCY) was

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29

Mei, Kaili, Kejia Zhang, Jungu Xu, and Zhengyang Zhou. "The Application of 3D-ED to Distinguish the Superstructure of Sr1.2Ca0.8Nb2O7 Ignored in SC-XRD." Crystals 13, no. 6 (June 8, 2023): 924. http://dx.doi.org/10.3390/cryst13060924.

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Compared to X-rays, electrons have stronger interactions with matter. In electron diffraction, the low-order structure factors are sensitive to subtle changes in the arrangement of valence electrons around atoms when the scattering vector is smaller than the critical scattering vector. Therefore, electron diffraction is more advantageous for studying the distribution of atoms in the structure with atomic numbers smaller than that of sulfur. In this work, the crystal structure of Sr1.2Ca0.8Nb2O7 (SCNO-0.8) was analyzed using single-crystal X-ray diffraction (SC-XRD) and three-dimensional electr

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30

Michael, J. R., M. E. Schlienger, and R. P. Goehner. "Electron Backscatter Diffraction In The Sem: Is Electron Diffraction In The Tem Obsolete?" Microscopy and Microanalysis 3, S2 (August 1997): 879–80. http://dx.doi.org/10.1017/s1431927600011284.

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The technique of electron backscatter diffraction (EBSD) in the scanning electron microscope is currently finding a large number of important applications in materials science. The patterns formed through EBSD were first studied over 40 years ago. It has only been in the last 10 years that the technique has really begun to have an impact on the study of materials. The introduction of automatic pattern indexing software has enabled the technique to be used for mapping the orientation of a polycrystalline sample. The more exciting and universally interesting application of the technique has been

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31

Reimer, L., and I. Fromm. "Electron spectroscopic diffraction at (111) silicon foils." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 382–83. http://dx.doi.org/10.1017/s0424820100153889.

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An electron diffraction pattern (EDP) consists of an overlap of patterns of all energy losses in the electron energy-loss spectrum (EELS). Electron spectroscopic diffraction (ESD) in an energy filtering electron microscope (EFEM) allows to separate the contributions of different energy losses to the unfiltered diagram observed in conventional TEM. We report about diffraction experiments with a Zeiss EM902 on (111) silicon foils which show how the EDP of single-crystal foils changes with increasing energy loss and foil thickness. An EDP normally contains the Bragg spots, diffuse streaks by elec

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32

Beeby, J. L. "Plasmon emission by electrons in reflection high energy electron diffraction." Surface Science 565, no. 2-3 (September 2004): 129–43. http://dx.doi.org/10.1016/j.susc.2004.06.175.

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33

Winkelmann, Aimo, Koceila Aizel, and Maarten Vos. "Electron energy loss and diffraction of backscattered electrons from silicon." New Journal of Physics 12, no. 5 (May 5, 2010): 053001. http://dx.doi.org/10.1088/1367-2630/12/5/053001.

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34

Li, Huawang. "Double-slit interference and single-slit diffraction experiments on electrons." Physics Essays 35, no. 3 (September 3, 2022): 313–19. http://dx.doi.org/10.4006/0836-1398-35.3.313.

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De Broglie proposed the matter wave in 1924. The de Broglie wave is neither a mechanical wave nor an electromagnetic wave and has a very short wavelength. The Davisson-Germer electron diffraction experiment performed in 1925 involved bombarding the surface of a nickel crystal with a narrow beam of electrons. When the accelerating voltage V was maintained at 54 V, the wavelength of the incident electron was λ=h/ <mml:math display="inline"> <mml:msqrt> <mml:mn>2</mml:mn> <mml:mi mathvariant="normal">m</mml:mi> <mml:mi mathvariant="normal">e</mml:mi&gt

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35

Wang, Z. L. "Diffraction theory of phonon-scattered electrons." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 788–89. http://dx.doi.org/10.1017/s0424820100088257.

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Electron-phonon interactions are inelastic scattering processes in high-energy electron diffraction, and are responsible for thermal diffuse scattering (TDS). The atomic thermal vibrations introduce a small time-dependent perturbation to the crystal potential(1)where is the displacement of the atom (at position within the hth unit cell (position R(h)) from its equilibrium position,(2)

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36

Ascolani, H., R. O. Barrachina, M. M. Guraya, and G. Zampieri. "Diffraction of electrons at intermediate energies." Physical Review B 46, no. 8 (August 15, 1992): 4899–908. http://dx.doi.org/10.1103/physrevb.46.4899.

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37

ZHANG, S. Y., Y. K. HO, Z. CHEN, Y. J. XIE, Z. YAN, and J. J. XU. "DYNAMIC TRAJECTORIES OF RELATIVISTIC ELECTRONS INJECTED INTO TIGHTLY-FOCUSED INTENSE LASER FIELDS." Journal of Nonlinear Optical Physics & Materials 13, no. 01 (March 2004): 103–12. http://dx.doi.org/10.1142/s0218863504001785.

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Dynamic trajectories of relativistic electrons injected into tightly focused ultra-intense laser field have been investigated. In addition to the previously-reported CAS (Capture and Acceleration Scenario) and IS (Inelastic Scattering) trajectories, a new kind of nonlinear electron trajectory is found when the beam waist radius w0 is small enough (kw0≤30, k is the wave number) and incident angle is small. We shall call it PARM (Penetrate into Axial Region and Move). The basic feature of PARM trajectory shows the strong diffraction effect of a tightly-focused laser field. Part of the incident e

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38

Lee, M. R. "Transmission electron microscopy (TEM) of Earth and planetary materials: A review." Mineralogical Magazine 74, no. 1 (February 2010): 1–27. http://dx.doi.org/10.1180/minmag.2010.074.1.1.

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AbstractUsing high intensity beams of fast electrons, the transmission electron microscope (TEM) and scanning transmission electron microscope (STEM) enable comprehensive characterization of rocks and minerals at micrometre to sub-nanometre scales. This review outlines the ways in which samples of Earth and planetary materials can be rendered sufficiently thin for TEM and STEM work, and highlights the significant advances in site-specific preparation enabled by the focused ion beam (FIB) technique. Descriptions of the various modes of TEM and STEM imaging, electron diffraction and X-ray and el

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Sakakura, Terutoshi, Takahiro Nakano, Hiroyuki Kimura, Yukio Noda, Yoshihisa Ishikawa, Yasuyuki Takenaka, Kiyoaki Tanaka, Shunji Kishimoto, Yoshinori Tokura, and Shigeki Miyasaka. "Importance of multiple diffraction avoidance for charge density observation." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C280. http://dx.doi.org/10.1107/s2053273314097198.

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It might not be well recognized, most reflections are contaminated by multiple diffractions (MD). Therefore high redundancy data could not coincide with high accuracy data when MDs are not avoided. We collected both data set of MD-avoided and no MD-avoided ones and investigated its effectiveness in electron density measurement. For data collection, four-circle diffractometer at KEK-PF BL14A (Tsukuba, Japan) was used. In MD-avoided measurement, each reflection is collected at angle setting of least of MD contamination which calculated by psi-scan simulation software MDC [1]. In no MD-avoided me

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Qin, L. C., and L. D. Marks. "Electron diffraction contrast of fluxons." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 1102–3. http://dx.doi.org/10.1017/s0424820100089822.

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Partial penetration of an applied external magnetic field occurs in type-II superconductors. The properties of magnetic fluxons are important in determining the critical current density of type-II superconductors as it is the mobility of the fluxon lattice that limits the high value of critical current density of superconductors. There have been various experimental techniques in use to study the fluxons, e.g. the decoration technique, neutron diffraction, electron holography and scanning tunneling microscopy.Noting that in the thin crystal case the magnetic fluxes have a tangential component

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Vincent, R. "Analysis of multiple diffraction contrast." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 48–51. http://dx.doi.org/10.1017/s0424820100125270.

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Transmission microscopy of modern alloys, ceramics and semiconductor/metal contact/insulator assemblies often discloses unfamiliar crystalline compounds, either uncharted on the relevant phase diagrams (if available) or metastable. Although the standard technigues of convergent beam electron diffraction (CBED) are sufficient to establish the space group, further progress towards defining the contents of the unit cell requires at least some qualitative estimate of the structure factors F, which are obscured by the varieties of multiple diffraction paths followed by electrons. However, modern an

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He, Y., L. M. Yu, P. A. Thiry, and R. Caudano. "Negative Ion Resonance Evidenced by Vibrationally Resolved Electron Diffraction On the H/Si(111) Surface." Surface Review and Letters 05, no. 01 (February 1998): 63–67. http://dx.doi.org/10.1142/s0218625x98000141.

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The surface vibrations of H-terminated Si(111) are investigated by high resolution electron energy loss spectroscopy (HREELS). Clear evidence is obtained for reassigning the electron resonant scattering from a surface resonance to a negative ion resonance mechanism. Since the electrons emitted from the trapping states show characteristic angular diffraction patterns realated with the geometric and vibrational symmetries of the surface, we suggest the possibility of using this system to investigate vibrationally resolved electron diffraction processes.

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Wang, Z. L. "Towards quantitative simulations of inelastic electron diffraction patterns and images." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (August 1992): 1170–71. http://dx.doi.org/10.1017/s0424820100130481.

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A new dynamical theory has been developed based on Yoshioka's coupled equations for describing inelastic electron scattering in thin crystals. Compared to existing theories, the primary advantage of this theory is that the incoherent summation of the diffracted intensities contributed by electrons after exciting vast numbers of different excited states has been evaluated before any numerical calculation. An additional advantage is that the phase correlations of atomic vibrations are considered, so that full lattice dynamics can be combined in the phonon scattering calculation. The new theory h

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Zou, Xiaodong, and Sven Hovmöller. "Structure Determination at Atomic Resolution by Electron Crystallography." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (August 12, 1990): 44–45. http://dx.doi.org/10.1017/s0424820100178975.

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Structure determination by electron microscopy is emerging as a serious competitor to the classical methods of X-ray diffraction. The main advantage of EM is that the phase information is restored in the image, whereas with X-ray diffraction it is lost.The structure determination of an inorganic crystal by electron microscopy would be trivial if the micrograph was just a magnified image of the electron density in the crystal. Unfortunately it is not. A limited number of non-linear effects distort the image. These effects can be divided into two parts; those arising already in the crystal and t

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BONDARCHUCK, O., S. GOYSA, I. KOVAL, P. MEL'NIK, and M. NAKHODKIN. "SHORT-RANGE ORDER OF DISORDERED SOLID SURFACES FROM ELASTICALLY SCATTERED ELECTRON SPECTRA." Surface Review and Letters 04, no. 05 (October 1997): 965–67. http://dx.doi.org/10.1142/s0218625x97001139.

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The diffraction phenomenon of low- and middle-energy electrons for disordered solid surfaces was experimentally studied and a new electron spectroscopy technique for surface short-range order parameter determination proposed.

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Li, Pen-Xin, Ai-Yun Yang, Lang Xin, Biao Xue, and Chun-Hao Yin. "Photocatalytic Activity and Mechanism of Cu²⁺ Doped ZnO Nanomaterials." Science of Advanced Materials 14, no. 10 (October 1, 2022): 1599–604. http://dx.doi.org/10.1166/sam.2022.4363.

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The photocatalytic activity and mechanism of photocatalysts made of ZnO nanoparticles before and after doping with different Cu2+ concentrations were studied by electron paramagnetic resonance and X-ray diffraction. The nanoparticles were prepared using sol–gel method. UV-vis spectrometers characterized the photocatalytic degradation effect of the composite samples on methyl orange solution. The results of X-ray diffraction showed that the hexagonal wurtzite structure of ZnO changed little by Cu2+ doping. With the increase in doping concentration, the CuO and Cu2O diffraction peaks were detect

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Takubo, Kou, Samiran Banu, Sichen Jin, Misaki Kaneko, Wataru Yajima, Makoto Kuwahara, Yasuhiko Hayashi, et al. "Generation of sub-100 fs electron pulses for time-resolved electron diffraction using a direct synchronization method." Review of Scientific Instruments 93, no. 5 (May 1, 2022): 053005. http://dx.doi.org/10.1063/5.0086008.

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To investigate photoinduced phenomena in various materials and molecules, ultrashort pulsed x-ray and electron sources with high brightness and high repetition rates are required. The x-ray and electron’s typical and de Broglie wavelengths are shorter than lattice constants of materials and molecules. Therefore, photoinduced structural dynamics on the femtosecond to picosecond timescales can be directly observed in a diffraction manner by using these pulses. This research created a tabletop ultrashort pulsed electron diffraction setup that used a femtosecond laser and electron pulse compressio

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Yang, Jinfeng, Kazuki Gen, Nobuyasu Naruse, Shouichi Sakakihara, and Yoichi Yoshida. "A Compact Ultrafast Electron Diffractometer with Relativistic Femtosecond Electron Pulses." Quantum Beam Science 4, no. 1 (January 20, 2020): 4. http://dx.doi.org/10.3390/qubs4010004.

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We have developed a compact relativistic femtosecond electron diffractometer with a radio-frequency photocathode electron gun and an electron lens system. The electron gun generated 2.5-MeV-energy electron pulses with a duration of 55 ± 5 fs containing 6.3 × 104 electrons per pulse. Using these pulses, we successfully detected high-contrast electron diffraction images of single crystalline, polycrystalline, and amorphous materials. An excellent spatial resolution of diffraction images was obtained as 0.027 ± 0.001 Å−1. In the time-resolved electron diffraction measurement, a laser-excited ultr

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Clabbers, M. T. B., E. van Genderen, W. Wan, E. L. Wiegers, T. Gruene, and J. P. Abrahams. "Protein structure determination by electron diffraction using a single three-dimensional nanocrystal." Acta Crystallographica Section D Structural Biology 73, no. 9 (August 15, 2017): 738–48. http://dx.doi.org/10.1107/s2059798317010348.

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Three-dimensional nanometre-sized crystals of macromolecules currently resist structure elucidation by single-crystal X-ray crystallography. Here, a single nanocrystal with a diffracting volume of only 0.14 µm3,i.e.no more than 6 × 105unit cells, provided sufficient information to determine the structure of a rare dimeric polymorph of hen egg-white lysozyme by electron crystallography. This is at least an order of magnitude smaller than was previously possible. The molecular-replacement solution, based on a monomeric polyalanine model, provided sufficient phasing power to show side-chain densi

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Zou, Xiaodong, and Sven Hovmöller. "Electron crystallography: imaging and single-crystal diffraction from powders." Acta Crystallographica Section A Foundations of Crystallography 64, no. 1 (December 21, 2007): 149–60. http://dx.doi.org/10.1107/s0108767307060084.

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The study of crystals at atomic level by electrons – electron crystallography – is an important complement to X-ray crystallography. There are two main advantages of structure determinations by electron crystallography compared to X-ray diffraction: (i) crystals millions of times smaller than those needed for X-ray diffraction can be studied and (ii) the phases of the crystallographic structure factors, which are lost in X-ray diffraction, are present in transmission-electron-microscopy (TEM) images. In this paper, some recent developments of electron crystallography and its applications, main

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