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Dissertations / Theses on the topic 'Absorption edge'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Al-Khuzaee, Jafar Hameed. "X-ray absorption edge structure in hot dense plasmas." Thesis, University of Essex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424128.

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2

Mizoguchi, Teruyasu, Atsuto Seko, Masato Yoshiya, et al. "X-ray absorption near-edge structures of disordered Mg_1−xZn_xO solid solutions." American Physical Society, 2007. http://hdl.handle.net/2237/11341.

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3

Mohammed, Osman Khan. "Pre-edge analysis of X-rays absorption spectra in TiO2 modified films." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7374/.

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The thesis is mainly focused on the pre-edge analysis of XAS spectra of Ti HCF sample hexacyanocobaltate and hexacyanoferrate samples doped on a Indium Tin Oxide (ITO) thin film. The work is aimed at the determination of Ti oxidation state, as well as indication of various coordination number in the studied samples. The experiment have been conducted using XAFS (X-ray absorption fine structure)beamline at Elettra synchrotron, Trieste (Italy) under supervision of Professor Marco Giorgetti, Department of Industrial Chemistry, University of Bologna. The Master thesis accreditation to full

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4

Nesvizhskii, Alexey I. "Theory and interpretation of L-shell x-ray absorption spectra /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/9738.

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5

Getty, Kendra Joyce. "Ruthenium K-edge X-ray absorption spectroscopy studies of ruthenium complexes relevant to olefin metathesis." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/657.

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Despite previous extensive study of the widely-employed ruthenium-catalysed olefin metathesis reaction, the finer mechanistic details have not been elucidated. An area that is noticeably lacking is spectroscopic exploration of the relevant complexes. In this work, organometallic ruthenium complexes of importance to olefin metathesis have been investigated using Ru K-edge X-ray absorption spectroscopy. The lowest energy feature in the Ru K-edge spectrum has been unambiguously assigned as due to Ru 4d←1s transitions. These electric-dipole-forbidden transitions are extremely sensitive to geometry

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6

Faust, Ian Charles. "Quantification of lower hybrid wave absorption in the edge of the Alcator C-Mod Tokamak." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107282.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2016.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references.<br>A 1 MW Lower Hybrid Current drive (LHCD) radiofrequency system is used to replace inductive drive on the Alcator C-Mod tokamak. It was designed to test Advanced Tokamak (AT) scenarios for future steady-state diverted, high field tokamaks. H

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7

Boysen, Ryan Bradley. "Development of palladium L-edge X-Ray absorption spectroscopy and its application on chloro palladium complexes." Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2005/boysen/BoysenR0506.pdf.

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X-ray Absorption Spectroscopy (XAS) is a synchrotron-based experimental technique that can provide information about geometric and electronic structures of transition metal complexes with unoccupied d orbitals. Combination of metal L-edge and ligand K-edge XAS has the potential to define the experimental ground state electronic structure. We developed a quantitative treatment for Pd L-edge spectroscopy based on the already established Cl K-edge XAS for a series of chloro palladium complexes, which are precatalysts in numerous organic transformations. We found that Pd-Cl bonds are highly covale

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8

Kaspar, Jennifer Deloris. "Evaluating the extent of delocalization in mixed-valence iron dimers using X-ray absorption near-edge structure spectroscopy /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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9

Willey, Trevor Michael. "Characterization of functionalized self-assembled monolayers and surface-attached interlocking molecules using near-edge X-ray absorption fine structure spectroscopy /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.

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10

Burresi, Emiliano. "Ab-initio determination of x-ray absorption near edge structure (xanes) spectra in an ultrasoft and norm conserving pseudopotentials scheme." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5937/.

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X-ray absorption spectroscopy (XAS) is a powerful means of investigation of structural and electronic properties in condensed -matter physics. Analysis of the near edge part of the XAS spectrum, the so – called X-ray Absorption Near Edge Structure (XANES), can typically provide the following information on the photoexcited atom: - Oxidation state and coordination environment. - Speciation of transition metal compounds. - Conduction band DOS projected on the excited atomic species (PDOS). Analysis of XANES spectra is greatly aided by simulations; in the most common scheme the multiple

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11

Ravel, Bruce D. "Ferroelectric phase transitions in oxide perovskites studied by XAFS /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9784.

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12

Giles, Logan James. "Multi-edge X-ray absorption spectroscopy and electronic structure calculations of biomimetic model complexes of the H-cluster of [FeFe]-hydrogenase." Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/giles/GilesL0512.pdf.

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FeFe-hydrogenases are members of a family of metalloenzymes that catalyze the conversion of protons and electrons to dihydrogen at a remarkable rate. The catalytic center of this enzyme, the H-cluster, contains a classical [4Fe-4S] cluster that is covalently and magnetically coupled through a cysteine residue to a 2Fe-subcluster. The 2Fe-subcluster contains normally biotoxic carbonyl and cyanide ligands and a dithiolate ligand that is unique in biology. Many biomimetic model complexes have been synthesized that attempted to mimic the H-cluster reactivity, but none have been successful at as lo

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13

Swaraj, Sufal. "Surface chemical characterization of plasma-chemically deposited polymer films by X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure." [S.l.] : [s.n.], 2005. http://www.diss.fu-berlin.de/2005/273/index.html.

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14

Spittel, Daniel, Jan Poppe, Christian Meerbach, Christoph Ziegler, Stephen G. Hickey, and Alexander Eychmüller. "Absolute Energy Level Positions in CdSe Nanostructures from Potential-Modulated Absorption Spectroscopy (EMAS)." American Chemical Society, 2017. https://tud.qucosa.de/id/qucosa%3A33353.

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Semiconductor nanostructures such as CdSe quantum dots and colloidal nanoplatelets exhibit remarkable optical properties, making them interesting for applications in optoelectronics and photocatalysis. For both areas of application a detailed understanding of the electronic structure is essential to achieve highly efficient devices. The electronic structure can be probed using the fact that optical properties of semiconductor nanoparticles are found to be extremely sensitive to the presence of excess charges that can for instance be generated by means of an electrochemical charge transfer via

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15

Brumboiu, Iulia Emilia. "The Electronic Structure of Organic Molecular Materials : Theoretical and Spectroscopic Investigations." Licentiate thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-218225.

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In the present thesis the electronic properties of two organic molecules were studied by means of density functional theory (DFT) in connection to their possible applications in organic photovoltaics and molecular spintronics respectively. The first analysed system is the C60 derivative PCBM extensively used in polymer solar cells for the charge separation process. Since fullerenes have been shown to undergo modifications as a result of light exposure, investigating their electronic structure is the first step in elucidating the photodegradation process. The electronic excitations from core le

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16

Niu, Lijie. "Arsenic Distribution and Speciation in Antigorite-Rich Rocks from Vermont, USA." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20204.

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Summary Serpentinites from the northern Vermont were examined for the distribution and abundance of As. XRD and electron microprobe showed the samples are composed of antigorite, chromite, magnetite, and carbonate minerals (magnesite, dolomite, calcite). The concentration in As when the samples were dissolved in H3PO4 was 10% of the concentration in As when the samples were dissolved in concentrated HF/HNO3, suggesting that As is mainly incorporated in the structure of antigorite. X-ray absorption near-edge structure spectra showed that the As is As(III) in the samples. Extended X-ray absorpt

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17

Jousseaume, Cécile. "Li2MSiO4 : Cr (M = Mg, Zn) : localisation du chrome dans la structure, caractérisation de ses états d'oxydation et propriétés optiques." Paris 6, 2002. http://www.theses.fr/2002PA066194.

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18

Samuel, Newton Thangadurai. "Structural characterization of adsorbed helical and beta-sheet peptides /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/9872.

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19

Foulis, David Laurence. "The effects of the use of full potentials in the calculation of X-ray absorption near-edge structure by the multiple-scattered-wave X-alpha method." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/110009/.

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In this work we describe the effects of the relaxation of the muffin-tin (MT) potential approximation (and the consequent use of full potentials (FPs)) in the ab initio calculation of X-ray-absorption near-edge structure (XANES) by the multiple-scattered-wave (MSW) Xα method. In doing so we demonstrate the validity and computational feasibility of the extended FP-MSW theory due to Natoli et al. (1986). We describe certain refinements to this theory and the development of a practicable computational approach for its realization. With the results of the newly-developed computer programs for cert

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20

Khaliq, Anzar. "Interface Chemistry and Energy Level Alignment of Silicon / Organic Semiconductor Heterostructures studied with Synchrotron Radiation X-ray Photoelectron Spectroscopy and Near Edge X-ray Absorption Fine Structure." Paris 6, 2012. http://www.theses.fr/2012PA066224.

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To date the most widely used inorganic semiconductor is silicon (Si). There is no denial to its contribution in the current standing of micro-electronics but with time its limitations have been exposed, especially the absence of coupling with opto-electronics due to its indirect band gap. Devices which consist of a hybrid of both organic (e. G. Dyes) and Si are thought to be an interesting extension of the next generation Si-based devices. In this context, the modification of Si with organic molecules represents a promising approach for the incorporation of new functionalities into semiconduct

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21

Satter, Md Mahbub. "Design and theoretical study of Wurtzite III-N deep ultraviolet edge emitting laser diodes." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53042.

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Designs for deep ultraviolet (DUV) edge emitting laser diodes (LDs) based on the wurtzite III-nitride (III-N) material system are presented. A combination of proprietary and commercial advanced semiconductor LD simulation software is used to study the operation of III-N based DUV LDs theoretically. Critical factors limiting device performance are identified based on an extensive literature survey. A comprehensive design parameter space is investigated thoroughly with the help of advanced scripting capabilities. Several design strategies are proposed to eliminate the critical problems completel

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22

Kahánek, Tomáš. "Optické vlastnosti monokrystalického křemíku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219524.

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This diploma thesis deals with optical properties of silicon. The main task of the work was to create silicon samples with ohmic contacts. Suitable radiation source was designed to measure absorption edge of monocrystalline silicon. Designed measuring station was realised. Measurements were performed on samples of p-type monocrystalline silicon provided by ON Semiconductor Rožnov. p. Radhoštěm. The absorbtion edge was measured.

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23

Weigel, Coralie. "Structure des verres dans le système NaFeSi2O6 - NaA1Si2O6 : comportement structural du fer." Paris 6, 2007. https://tel.archives-ouvertes.fr/tel-00811196.

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La diffraction des neutrons avec substitution isotopique du fer combinée avec des simulations structurales (Empirical Potential Structure Refinement, EPSR) a permis de sonder les sites de Fe2+ et de Fe3+ dans un verre NaFeSi2O6 oxydé. Cette étude met en évidence la présence de deux sites pour Fe3+. 70% du Fe3+ est en site tétraédrique (dFe3+-O=1. 866±0. 001 Å), le reste de Fe3+ et tout Fe2+ (~12% de Fetot) est en coordinence 5. Fe3+ en coordinence 4 jouerait un rôle de formateur de réseau, alors que le fer en coordinence 5 a tendance à ségréger et jouerait le rôle de modificateur. La présence

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24

Kočer, Martin. "Optické vlastnosti organických polovodičů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220239.

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This diploma thesis deals with optical properties of organic semiconductors and measuring method of absorption edge. Project is focused on absorption of light in organic semiconductors. This work also describes device for measuring of absorption edge.

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25

Gumeniuk, Roman, Lev Akselrud, Kristina O. Kvashnina, et al. "Ca3Pt4+xGe13−y and Yb3Pt4Ge13: new derivatives of the Pr3Rh4Sn13 structure type." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138956.

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The new phases Ca3Pt4+xGe13−y (x = 0.1; y = 0.4; space group I213; a = 18.0578(1) Å; RI = 0.063; RP = 0.083) and Yb3Pt4Ge13 (space group P42cm; a = 12.7479(1) Å; c = 9.0009(1) Å; RI = 0.061, RP = 0.117) are obtained by high-pressure, high-temperature synthesis and crystallize in new distortion variants of the Pr3Rh4Sn13 type. Yb3Pt4Ge13 features Yb in a temperature-independent non-magnetic 4f14 (Yb2+) configuration validated by X-ray absorption spectra and resonant inelastic X-ray scattering data. Ca3Pt4+xGe13−y is diamagnetic (χ0 = −5.05 × 10−6 emu mol−1). The Sommerfeld coefficient γ = 4.4 m

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26

Weigel, Coralie. "Structure des verres dans le système NaFeSi2O6 - NaAlSi2O6 Comportement structural du fer." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2007. http://tel.archives-ouvertes.fr/tel-00811196.

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La diffraction des neutrons avec substitution isotopique du fer combinée avec des simulations structurales (Empirical Potential Structure Refinement, EPSR) a permis de sonder les sites de Fe2+ et de Fe3+ dans un verre NaFeSi2O6 oxydé. Cette étude met en évidence la présence de deux sites pour Fe3+. 70% du Fe3+ est en site tétraédrique (dFe3+-O=1.866±0.001 Å), le reste de Fe3+ et tout Fe2+ (~12% de Fetot) est en coordinence 5. Fe3+ en coordinence 4 jouerait un rôle de formateur de réseau, alors que le fer en coordinence 5 a tendance à ségréger et jouerait le rôle de modificateur. La présence de

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27

Gumeniuk, Roman, Lev Akselrud, Kristina O. Kvashnina, et al. "Ca3Pt4+xGe13−y and Yb3Pt4Ge13: new derivatives of the Pr3Rh4Sn13 structure type." Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27796.

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The new phases Ca3Pt4+xGe13−y (x = 0.1; y = 0.4; space group I213; a = 18.0578(1) Å; RI = 0.063; RP = 0.083) and Yb3Pt4Ge13 (space group P42cm; a = 12.7479(1) Å; c = 9.0009(1) Å; RI = 0.061, RP = 0.117) are obtained by high-pressure, high-temperature synthesis and crystallize in new distortion variants of the Pr3Rh4Sn13 type. Yb3Pt4Ge13 features Yb in a temperature-independent non-magnetic 4f14 (Yb2+) configuration validated by X-ray absorption spectra and resonant inelastic X-ray scattering data. Ca3Pt4+xGe13−y is diamagnetic (χ0 = −5.05 × 10−6 emu mol−1). The Sommerfeld coefficient γ = 4.4 m

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28

Schiffrin, Agustin. "Self-assembly of amino acids on noble metal surfaces : morphological, chemical and electronic control of matter at the nanoscale." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/798.

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Designing novel nanostructures which exploit the self-assembly capabilities of biomolecules yields a promising approach to control matter at the nanoscale. Here, the homochiral molecular self-assemblies of the methionine and tyrosine amino acids on the monocrystalline Ag(111) and Cu(111) surfaces are characterized by means of scanning tunneling microscopy (STM) and spectroscopy (STS), helium atom scattering (HAS), x-ray photoelectron spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) in ultrahigh vacuum (UHV). On Ag(111), methionine self-assembles into supramolecular cha

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29

Ervin, Clara Ray. "Poultry Litter Ash as an Alternative Fertilizer Source for Corn." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/103199.

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Poultry litter ash (PLA) is a co-product from manure-to-energy systems that originated in response to increased poultry litter (PL) volumes generated in concentrated poultry production regions. Investigating PLA as a crop fertilizer is an alternative solution to balancing poultry and crop regional nutrient cycling in the Commonwealth of Virginia. As the expanding world population places pressure on the poultry industry to meet consumption demands, increased PL production presents an obstacle to identify alternative uses for increased volumes. Currently, Virginia produces 44 million broilers wi

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30

Morgan, Philip Alan. "Boundary element modelling and full scale measurement of the acoustic performance of outdoor noise barriers." Thesis, Brunel University, 1999. http://bura.brunel.ac.uk/handle/2438/4921.

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The performance of various designs of outdoor noise barrier has been investigated using numerical modelling and full scale experiments. The numerical modelling has been performed using a two-dimensional boundary element method. The model has been extended to allow the efficient simulation of barrier arrangements on ground having two distinct impedance values and cross-sections incorporating cuttings. It has been reported previously that the performance of a plane screen can be enhanced by adding a device to the top of the barrier to induce destructive interference. Full scale modelling and bou

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31

Jenderka, Marcus, Steffen Richter, Michael Lorenz, and Marius Grundmann. "Fundamental absorption edges in heteroepitaxial YBiO3 thin films." American Institute of Physics, 2016. https://ul.qucosa.de/id/qucosa%3A31230.

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The dielectric function of heteroepitaxial YBiO3 grown on a-Al2O3 single crystals via pulsed laser deposition is determined in the spectral range from 0.03 eV to 4.5 eV by a simultaneous modeling of the spectroscopic ellipsometry and optical transmission data of YBiO3 films of different thicknesses. The (111)-oriented YBiO3 films are nominally unstrained and crystallize in a defective fluorite-type structure with a Fm3⎯⎯m space group. From the calculated absorption spectrum, a direct electronic bandgap energy of 3.6(1) eV and the signature of an indirect electronic transition around 0.5 eV are

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32

Watcharinyanon, Somsakul. "Characterization of Self-Assembled Monolayers of Oligo(phenyleneethynylene) Derivatives on Gold." Licentiate thesis, Karlstad : Faculty of Technology and Science, Physics, Karlstad University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-800.

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33

Ghose, Sujit Kumar. "Study of the scattering of photons near absorption edges." Thesis, University of North Bengal, 1991. http://hdl.handle.net/123456789/677.

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34

Carlegrim, Elin. "Preparation and characterization of an organic-based magnet." Licentiate thesis, Norrköping : Department of Science and Technology, Linköping University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10426.

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35

Watcharinyanon, Somsakul. "Structure of Self-Assembled Monolayers on Gold Studied by NEXAFS and Photoelectron Spectroscopy." Doctoral thesis, Karlstad : Faculty of Technology and Science, Physics, Karlstads universitet, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-2723.

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36

Khatiwada, Raju. "Speciation of phosphorus in reduced tillage systems: placement and source effect." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/9973.

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Master of Science<br>Department of Agronomy<br>Ganga M. Hettiarachchi<br>Phosphorus (P) management in reduced tillage systems has been a great concern for farmers. Conclusive results for benefits of deep banding of P fertilizers for plant yield in reduced tillage system are still lacking. Knowledge of the dominant solid P species present in soil following application of P fertilizers and linking that to potential P availability would help us to design better P management practices. The objectives of this research were to understand the influence of placement (broadcast- vs. deep band-P or deep

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37

Aitchison, Hannah. "Self-assembly of monolayers of aromatic carboxylic acid molecules on silver and copper modified gold surfaces at the liquid-solid interface." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6950.

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Exploiting coordination bonding of aromatic carboxylic acids at metal surfaces, this thesis explores new directions in the design and application of self-assembled monolayers (SAMs). The SAMs are investigated using a multi-technique approach comprising of a complementary combination of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. In addition, the X-ray standing wave technique (XSW) was used to characterise the substrates. The process of layer formation and the final structures of the SAMs are fo

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38

Nunes, Claudia Carvalho. "Propriedades estruturais do material vitreo silica-titania produzido pelo metodo do aerosol em chama." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264844.

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Orientador: Carlos Kenichi Suzuki<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-11T16:06:32Z (GMT). No. of bitstreams: 1 Nunes_ClaudiaCarvalho_M.pdf: 7074659 bytes, checksum: 4dec2d1e75a640341af023ba7541f5cb (MD5) Previous issue date: 2008<br>Resumo: O sistema binário sílica titânia, SiO2-TiO2,apresenta grande interesse tecnológico devido as suas propriedades: ultra-baixo coeficiente de expansão térmico e alto índice de refração. As propriedades são dependentes da quantidade de dopante presente no materi

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39

Griffith, Kent Joseph. "Atomic and electronic structure of complex metal oxides during electrochemical reaction with lithium." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271191.

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Lithium-ion batteries have transformed energy storage and technological applications. They stand poised to convert transportation from combustion to electric engines. The discharge/charge rate is a key parameter that determines battery power output and recharge time; typically, operation is on the timescale of hours but reducing this would improve existing applications and open up new possibilities. Conventionally, the rate at which a battery can operate has been improved by synthetic strategies to decrease the solid-state diffusion length of lithium ions by decreasing particle sizes down to t

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40

Grossemy, Faustine. "Des grains cométaires en laboratoire : premiers résultats de la mission Stardust." Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00321787.

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Ma thèse porte sur l'analyse par SXRM (Synchrotron X-Ray Microscopy) et spectroscopie µ-FTIR (micro Fourier Transformed InfraRed) des échantillons de la comète Wild 2 collectés par la mission Stardust. Les analyses SXRM ont permis de déterminer la composition élémentaire des grains de Wild 2, tout en étudiant leur ralentissement dans l'aérogel. Une étude XANES (X-Ray Absorption Near Edge Structure) au seuil du fer d'analogues des échantillons Stardust a permis de valider la méthode de collecte des grains en se basant sur l'état d'oxydation du fer. Malgré l'élévation de température subie par la

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41

Smykalla, Lars. "Investigation of the supramolecular self-assembly, electronic properties, and on-surface reactions of porphyrin and phthalocyanine molecules." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-216602.

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Das grundlegende Verständnis der Adsorption, der Eigenschaften, und der Wechselwirkungen von komplexen organischen Molekülen auf Festkörperoberflächen ist für die Entwicklung neuer Anwendungen in der Nanotechnologie von entscheidender Bedeutung. Die in dieser Arbeit untersuchten funktionellen Bausteine gehören zu den Porphyrinen und Phthalocyaninen. Deren Adsorption, elektronische Struktur, und Reaktionen der Moleküle auf Edelmetalloberflächen wurden mit mehreren Methoden charakterisiert, insbesondere der Rastertunnelmikroskopie, Rastertunnelspektroskopie, Röntgen-Nahkanten-Absorptions-Spektro

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42

Delhommaye, Steven. "Single-particle modelling of X-ray Absorption and X-ray Raman Scattering spectra : from the impact of vibrations on multipole transition channels to the implementation of L2,3 edges." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS076.

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Ce travail de thèse porte sur les spectroscopies d’électrons de niveau de cœur ainsi que leur modélisation par la suite de code open source Quantum ESPRESSO. Il porte en particulier sur la Spectroscopie d’Absorption des rayons X (XAS), déjà bien établie, et la Spectroscopie Raman des rayons X (XRS), une alternative au XAS gagnant en popularité, par exemple dans le cas de mesures sous conditions extrêmes. Le premier objectif de cette thèse était l’étude de l’impact des vibrations thermiques des noyaux sur les contributions multipolaires en XAS et en XRS. En effet, le modèle QHA utilisé pour pre

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Haidu, Francisc. "Tailoring the Electronic and Optical Properties of Molecular Thin Films by Reducing and Oxidising Agents." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159012.

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Heutzutage wächst die Nachfrage nach neuartigen Geräten, die teilweise (hybrid) oder völlig aus organischen halbleitenden Materialien hergestellt sind. Der Grund dafür sind die geringen Herstellungskosten sowie die hohe Flexibilität im Moleküldesign und damit einstellbare optische, elektronische und Spintronik-Eigenschaften. Bisher sind mit großem Erfolg organische Leuchtdioden (OLED), organische Solarzellen und gedruckte organische Elektronik-Bauelemente hergestellt worden. Auf Grund ihrer langen Spin-Lebensdauer sind Moleküle auch für Spintronik-Anwendungen sehr geeignet. In dieser Arbeit wu

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王紹宇. "Study of Correction of X-ray Absorption Near Edge Structure : MgO." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29989095133226603937.

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碩士<br>國立臺灣師範大學<br>物理學系<br>95<br>By using the method of the total fluorescence yield, one can obtain the X-ray absorption near-edge spectrum. But the target self-absorption effect will distort the intensity of X-ray absorption near-edge spectrum, especially at the resonance absorption peaks. It is important to correct the target self-absorption effect in the X-ray absorption near-edge spectrum for some experiments in which the information of the absorption intensity is important. The other effect that may make the X-ray absorption near-edge spectrum distorted is the core hole effect. We shall e

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CHEN, ZIH-RONG, and 陳自榮. "Design and fabrication of solar concentrator for edge-absorption concentrated photovoltaic system." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/94470896005362670133.

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碩士<br>國立中央大學<br>機械工程學系<br>103<br>In this research, the design of planar solar concentrator (PSC) will be applied to portable charger. Using polymathic methacrylate (PMMA) as the material, and use the characteristics of refractive index to design the planar solar concentrator. Designing the V-shape, and reflection surfaces at different angles in different reflection position. With these reflection surfaces reflecting the light to the side of planar solar concentrator. Using computer software to calculate the reflector surfaces, and use the LightTools to analysis. After the design of concentrato

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Chang, Cheng-Pin, and 張政斌. "Influence of Edge Restraints on the Sound Absorption Coefficient of Porous Materials." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/01042277513365957822.

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碩士<br>淡江大學<br>機械與機電工程學系<br>92<br>The influence of edge restraints on the sound absorption coefficient of porous materials is studied in this thesis. Instead of the use of air for actuating the porous materials, a uniformly distributed impulsive pressure is directly applied on the surface of the porous materials in the study. Through the Laplace domain finite element method, the surface acoustic impedance of porous materials is directly obtained and the sound absorption coefficient is calculated accordingly. The sound absorption characteristics of porous plates with different thick

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Hsiang, Chien-Chou, and 向建州. "X-Ray near-edge Absorption Spectroscopy of YBCO with different Ca and Oxygen doped." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/95554002486055368042.

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碩士<br>國立交通大學<br>物理研究所<br>88<br>Using polarization-dependent O 1s and Cu 2p near-edge x-ray absorption structure on Y1-xCaxBa2Cu3Oy thin films, we have identified the unoccupied electronic states of the samples and studied the dependence on Ca concentration. X-ray absorption structure (XANES) was recorded by fluorescence yield mode, which is a bulk-sensitive technique. XANES can give information about the carrier concentration n on specific sites. Results: Both of Ca and Oxygen doping increase hole numbers. With Ca doping, the induced holes almost increase on

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Spittel, D., J. Poppe, C. Meerbach, C. Ziegler, Stephen G. Hickey, and A. Eychmüller. "Absolute Energy Level Positions in CdSe Nanostructures from Potential-Modulated Absorption Spectroscopy (EMAS)." 2017. http://hdl.handle.net/10454/14149.

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Yes<br>Semiconductor nanostructures like CdSe quantum dots and colloidal nanoplatelets exhibit remarkable optical properties, making them interesting for applications in optoelectronics and photocatalysis. For both areas of application a detailed understanding of the electronic structure is essential to achieve highly efficient devices. The electronic structure can be probed using the fact that optical properties of semiconductor nanoparticles are found to be extremely sensitive to the presence of excess charges that can for instance be generated by means of an electrochemical charge tra

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謝和諶, Ho-Chen Hshie, and 謝和諶. "Apply Cl and Fe K-edge X-ray Absorption Spectroscopy on Characterization of Iron(III) Chloride Complexes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/jar6u7.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>101<br>X-ray absorption spectroscopy (XAS) is a powerful technique to study the electronic and geometric structures of metal complexes. In general, the XANES (x-ray absorption near edge structure) can be applied to resolve the electronic structure and EXAFS (extend x-ray absorption fine structure) can provide the local structure of the absorbing atom. In addition, a combination with XAS and TD-DFT (time dependent density functional theory) will provide more detailed information of metal and ligand bonding. In this thesis, the EXAFS of Fe K-edge spectra will be use

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Mok, Boon-How, and 莫文皓. "Investigation of the crystal growth, magnetic properties and X-ray absorption Near Edge Structure of Tetragonal FeSex." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/62551759669099049878.

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博士<br>國立清華大學<br>材料科學工程學系<br>99<br>Soon after the discovery of LaO1-xFxFeAs with superconductivity transition Tc ~ 26 K, the Tc of iron-based superconductor was quickly raising up to 56 K. More iron-based superconductors, e.g., (Ba,K)Fe2As2, LiFeAs and Fe1+yTe1-xSex were discovered subsequently. Among of that, Iron-chacogenides series, i.e. FeSex, has triggered great interest because of its simplest crystal structure and superconductivity below 8 K without any carrier doping. It do not involve arsenic but share several common features with iron-pnictides. The simplest structure of FeSe-supercon

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