Log in

Relevant bibliographies by topics / Atom atom collision / Journal articles

To see the other types of publications on this topic, follow the link: Atom atom collision.

Journal articles on the topic 'Atom atom collision'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Atom atom collision.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Prasad, Vinod, Rinku Sharma, and Man Mohan. "Laser Assisted Electron - Alkali Atom Collisions." Australian Journal of Physics 49, no. 6 (1996): 1109. http://dx.doi.org/10.1071/ph961109.

Full text

Abstract:

Lasar assisted inelastic scattering of electrons by alkali atoms is studied theoretically. The non-perturbative quasi-energy method, which is generalised for many atomic states, is used to describe the laser–atom interaction, and the electron–atom interaction is treated within the first Born approximation. We have calculated the total cross section for the excitation of sodium atoms due to simultaneous electron–photon collisions. We show the effect of laser and collision parameters, e.g. laser intensity, polarisation and incident electron energy, on the excitation process.

APA, Harvard, Vancouver, ISO, and other styles

2

Prepelita, Oleg. "Spontaneous decay in cold dense atomic systems: caloric effect and spectrum of emitted light." Canadian Journal of Physics 94, no. 7 (July 2016): 1–12. http://dx.doi.org/10.1139/cjp-2016-0098.

Full text

Abstract:

We discuss collision-induced spontaneous decay in a system of cold atoms and caloric effect manifesting in the heating of the atomic system during spontaneous decay. It is shown that the caloric effect is caused by inelastic atom–atom collisions accompanied by the spontaneous emission of photons. Because of the imbalance between the rate of emission of the photons with the frequency higher and lower than the atomic transition frequency, the atomic system, under some conditions, is heated up. The value of the critical temperature is found, which separates the regions where the collision-induced spontaneous decay is exothermic and endothermic.

APA, Harvard, Vancouver, ISO, and other styles

3

McAlinden, Mary T., F. G. R. S. MacDonald, and H. R. J. Walters. "Positronium–atom scattering." Canadian Journal of Physics 74, no. 7-8 (July 1, 1996): 434–44. http://dx.doi.org/10.1139/p96-062.

Full text

Abstract:

Calculations of total cross sections for Ps(1 s) scattering by atomic hydrogen, helium, and argon are reported for the energy range 0–150 eV. The results for atomic hydrogen have been evaluated exactly within the first Born approximation. For collisions with helium and argon in which the target remains in its initial state (so called target elastic collisions) it is assumed that the positronium scatters off a frozen target atom and a coupled positronium pseudostate approximation is then used to calculate the cross sections. For collisions in which the target atom is excited or ionized (target inelastic collisions) the first Born approximation is adopted. Here there is a significant problem in summing over all final states of the target and for this a scheme due to Hartley and Walters has been employed. It is found that for the light targets, hydrogen and helium, target inelastic collisions become dominant above 45 and 105 eV, respectively, while for the heavier argon atom, target elastic scattering is always more important. Except at the lowest energies, and for both target elastic and target inelastic collisions, positronium ionization is the main outcome of the collision for all three atoms. There is an encouraging degree of agreement at the higher energies with the total cross-section measurements of Zafar et al. and Laricchia et al. for helium and argon. The present approximations do not include electron exchange between the positronium and the atom which may be the main source of disagreement between theory and experiment elsewhere.

APA, Harvard, Vancouver, ISO, and other styles

4

Joachain, C. J. "Laser-Assisted Electron-Atom Collisions." Laser Chemistry 11, no. 3-4 (January 1, 1991): 273–77. http://dx.doi.org/10.1155/lc.11.273.

Full text

Abstract:

The theoretical methods which have been developed to analyze laser-assisted electron-atom collisions are reviewed. Firstly, the scattering of an electron by a potential in the presence of a laser field is considered. The analysis is then generalized to laser-assisted collisions of electrons with “real” atoms having an internal structure. Two methods are discussed: a semi-perturbative approach suitable for fast incident electrons and a fully non-perturbative theory—the R-matrix-Floquet method—which is applicable to the case of slow incident electrons. In particular it is shown how the dressing of the atomic states by the laser field can affect the collision cross sections.

APA, Harvard, Vancouver, ISO, and other styles

5

VANDONI, G., C. FÉLIX, R. MONOT, J. BUTTET, C. MASSOBRIO, and W. HARBICH. "DEPOSITION OF MASS-SELECTED Ag7 ON Pd(100): FRAGMENTATION AND IMPLANTATION." Surface Review and Letters 03, no. 01 (February 1996): 949–54. http://dx.doi.org/10.1142/s0218625x96001704.

Full text

Abstract:

Mass-selected silver-cluster ions [Formula: see text] with an incident energy of 2.86 eV/atom and of 13.6 eV/atom are directed on a well-prepared Pd(100) surface, which is probed with thermal-energy atom (helium) scattering (TEAS), before, during, and after the deposition, yielding information on the collision process. We find that part of the cluster atoms are implanted into the surface layer, the fraction depending on the impact energy. Considerable fragmentation is present at both impact energies. Molecular dynamics calculations based on embedded atom method (EAM) potentials are used to model the collision process. These calculations confirm qualitatively the experimental results.

APA, Harvard, Vancouver, ISO, and other styles

6

Kirsanov, V. V., S. B. Kislitsin, and E. M. Kislitsina. "Atom—atom collision cascades in non-uniformly stressed metals." Philosophical Magazine A 64, no. 1 (July 1991): 201–11. http://dx.doi.org/10.1080/01418619108206135.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Goldstein, R., C. Figl, J. Grosser, O. Hoffmann, M. Jungen, J. Stalder, and F. Rebentrost. "Collision photography: Polarization imaging of atom-molecule collisions." Journal of Chemical Physics 121, no. 18 (November 8, 2004): 8769–74. http://dx.doi.org/10.1063/1.1799592.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Prasad, Vinod, Rinku Sharma, and Man Mohan. "Excitation Dynamics of an Atom due to Heavy Ion Impact in a Laser Field." Australian Journal of Physics 51, no. 3 (1998): 527. http://dx.doi.org/10.1071/p97077.

Full text

Abstract:

Laser assisted inelastic scattering of heavy ions by alkali atoms is studied theoretically. The non-perturbative quasi-energy method, generalised for many states, is used to describe the laser-atom interaction, and the close coupling method using the impact parameter method is used for scattering calculations. We have calculated the transition probabilities and total cross section for the excitation of alkali atoms, due to simultaneous proton-photon collisions. We show the effect of laser and collision parameters, e.g. laser intensity, impact parameter, laser frequency, on the excitation process.

APA, Harvard, Vancouver, ISO, and other styles

9

Mo, Dan, Jun Cai, Ya Lin Li, and Yan Dong Wang. "Cascade Collision near the Grain Boundary of Fe-Cr Alloy by MD Simulation." Materials Science Forum 913 (February 2018): 642–49. http://dx.doi.org/10.4028/www.scientific.net/msf.913.642.

Full text

Abstract:

Using molecular dynamics method to study the cascade collision for the case of PKA(Primary Knock-on Atom) atoms at different distance from the grain boundary(GB) of iron chromium alloy. It is found that the PKA atoms at the GB will produce a large size cluster (size from 11 to 409 ) consisting of interstitial and vacancies, and many small clusters (number from 5 to 50). The size and number of the cluster depend heavily on PKA energy, while depend weakly on temperature. The PKA atom at distance of 1nm from the GB, sometimes produces large size defect clusters both inside and outside the GB region. When the PKA atom is at 1nm, 2nm and even 3nm, 4nm from the GB, the GB will effectively absorb the interstitial atoms. It is found that the atomic ratio of Cr-interstitial to total interstitial produced at the GB region is much less than one at outside of GB region.

APA, Harvard, Vancouver, ISO, and other styles

10

Pushkarev, A., A. Prima, V. Myshkin, N. Chistyakova, and V. Ezhov. "Comparison of Influence of the Fast Atom Beam and Ion Beam on the Metal Target." Laser and Particle Beams 2021 (January 12, 2021): 1–9. http://dx.doi.org/10.1155/2021/6630259.

Full text

Abstract:

A comparative analysis of a fast atom beam and ion beam effect on a metal target in the binary collision model is performed. Irradiation by fast atoms has been shown to more closely correspond to neutron radiation in a nuclear reactor, in terms of the primary knocked-on atom spectrum and the efficiency and mechanism of the radiation defect formation. It was found that upon irradiation by fast carbon atoms with an energy of 0.2-0.3 MeV, the average number of radiation defects in the displacement cascade of one atom is four to five times higher than the calculated values using the SRIM program for ions with the same energy. It is shown that during penetration in the target, the probability of ionization of atoms with energies less than 0.4 MeV is negligible.

APA, Harvard, Vancouver, ISO, and other styles

11

Ponce, Lino, Richard Taïeb, Valérie Véniard, and Alfred Maquet. "Attosecond-scale dynamics in ion–atom collision versus laser–atom interaction." Journal of Physics B: Atomic, Molecular and Optical Physics 39, no. 23 (November 21, 2006): 4985–98. http://dx.doi.org/10.1088/0953-4075/39/23/015.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

DE OLIVEIRA, M. C., and B. R. DA CUNHA. "COLLISION-DEPENDENT ATOM TUNNELING RATE — BOSE–EINSTEIN CONDENSATES IN DOUBLE AND MULTIPLE WELL TRAPS." International Journal of Modern Physics B 23, no. 32 (December 30, 2009): 5867–80. http://dx.doi.org/10.1142/s0217979209054818.

Full text

Abstract:

The overlap of localized wave functions in a two-mode approximation leads to interaction (cross-collision) between ultra-cold atoms trapped in distinct sites of a double-well potential. We show that this interaction can significantly change the atom tunneling rate for special trap configurations resulting in an effective linear Rabi regime of population oscillation between the trap wells. In this sense, we demonstrate that cross-collisional effects can significantly extend the validity of the two-mode model approach allowing it to be alternatively employed to explain the recently observed increase of tunneling rates due to nonlinear interactions. Moreover, we investigate the extension for ultra-cold atoms trapped in an optical lattice. Control over the cross-collisional terms, obtained through manipulation of the optical trapping potential, can be used as an engineering tool to study many-body physics.

APA, Harvard, Vancouver, ISO, and other styles

13

Vichev, R. G., and D. S. Karpuzov. "Time-dependent angular and energy distributions of sputtered copper atoms." Canadian Journal of Physics 78, no. 9 (September 1, 2000): 865–74. http://dx.doi.org/10.1139/p00-051.

Full text

Abstract:

Time reference was introduced in the TRIM computer simulation code without changing the "event-driven" logic of the program. The code was applied to model the atomic collision cascades and sputtering of amorphous copper targets caused by bombardment of keV ions of different masses (Be, Ne, Ar, Cu, Xe, Au). Time-dependent characteristics of ion-induced processes such as mean number and energy of moving target atoms, number of collisions and vacancies (or) recoils created, sputtering yield, mean energy and angle of ejection of sputtered atoms were obtained, and their dependence on the ion/atom mass ratio is discussed. PACS No.: 79.20-m

APA, Harvard, Vancouver, ISO, and other styles

14

Bjorkholm, J. E. "Collision-limited lifetimes of atom traps." Physical Review A 38, no. 3 (August 1, 1988): 1599–600. http://dx.doi.org/10.1103/physreva.38.1599.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Pandey, A., M. Niranjan, N. Joshi, S. A. Rangwala, and O. Dulieu. "Modeling ultracold lithium ion-atom collision." Journal of Physics: Conference Series 1412 (January 2020): 122010. http://dx.doi.org/10.1088/1742-6596/1412/12/122010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Bougouffa, S., and A. Kamli. "Analysis of electron-atom collision processes involving strong coupling." Canadian Journal of Physics 82, no. 3 (March 1, 2004): 185–95. http://dx.doi.org/10.1139/p03-115.

Full text

Abstract:

Inelastic electron sodium atom collisions are investigated in the two-channel approximation. The scattering potentials are calculated using hydrogen-like wave functions for the valence electron of sodium. The coupled differential equations governing the collision process are solved using the Numerov numerical technique. The results thus obtained are in good agreement with those obtained by other sophisticated models. PACS Nos.: 34.50.Fa, 34.80.Dp

APA, Harvard, Vancouver, ISO, and other styles

17

Golubkov, G. V., A. Z. Devdariani, and M. G. Golubkov. "Collision of Rydberg atom A** with ground-state atom B: Optical potential." Journal of Experimental and Theoretical Physics Letters 75, no. 7 (April 2002): 314–16. http://dx.doi.org/10.1134/1.1485258.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

CHIN, CHENG, ANDREW J. KERMAN, VLADAN VULETIĆ, and STEVEN CHU. "CONTROLLED ATOM-MOLECULE INTERACTIONS IN ULTRACOLD GASES." Modern Physics Letters A 18, no. 02n06 (February 28, 2003): 398–401. http://dx.doi.org/10.1142/s0217732303010557.

Full text

Abstract:

We observe and study the dynamic formation of cold Cs 2 molecules near collision Feshbach resonances in a cold cesium sample. The resonance Iinewidth is as low as E/h = 5 kHz , or equivalently, 10-11 eV. We suggest that few-atom, interaction effects can be studied in a 3D optical lattice where several atoms can be confined and isolated in an optical cell, which allows exquisite control of the atomic density and the interaction cross section.

APA, Harvard, Vancouver, ISO, and other styles

19

Yadav, K., S. P. Gupta, and J. J. Nakarmi. "Study of the Dressed State of Hydrogen Atom in Electron Atom Elastic Collision in Laser Field." Journal of Nepal Physical Society 6, no. 2 (December 31, 2020): 149–57. http://dx.doi.org/10.3126/jnphyssoc.v6i2.34870.

Full text

Abstract:

We discuss the various important aspects of the theory of electron-atom elastic collision in laser field. We analyze the collision accompanied by the transfer of photons. We study the free electron states i.e. Volkov states and target atomic states i.e. Dressed states. We calculate the first-Born scattering matrix for electron-atom elastic collision. The present work accounts the calculation for hydrogen as target atom in soft photon limits i.e., in weak field. The dressing effect becomes significant in the region of low momentum transfer, reaches maximum of value of 25000 a.u. at momentum transfer of 0.44. This work explains that the differential cross-section does not occur very low and at very high momentum transfer. However, it occurs at moderate momentum transfer.

APA, Harvard, Vancouver, ISO, and other styles

20

Yasuda, Masaaki, Shinya Wakuda, Yoshiki Asayama, Hiroaki Kawata, and Yoshihiko Hirai. "Interaction volume of electron beam in carbon nanomaterials: A molecular dynamics study." MRS Proceedings 1700 (2014): 29–35. http://dx.doi.org/10.1557/opl.2014.675.

Full text

Abstract:

ABSTRACTA molecular dynamics (MD) simulation was performed to study the interaction volume of electron beam in carbon nanomaterials. The interaction between incident electron and carbon atom in the target materials during electron irradiation is introduced by the relativistic binary collision theory. The motion of each atom in the material under electron irradiation is calculated with the MD simulation. The primary energy dependence of the interaction volume in the carbon nanotube and the multi-layered graphene are studied. The secondary damages caused by the knock-on atoms are also discussed.

APA, Harvard, Vancouver, ISO, and other styles

21

RICZ, S., I. KÁDÁR, and J. VÉGH. "POST COLLISION INTERACTION OBSERVED AT HIGH-ENERGY ION-ATOM COLLISIONS." Le Journal de Physique Colloques 50, no. C1 (January 1989): C1–199—C1–204. http://dx.doi.org/10.1051/jphyscol:1989124.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Ren, Fei, Mengli Yao, Min Li, and Hui Wang. "Tailoring the Structural and Electronic Properties of Graphene through Ion Implantation." Materials 14, no. 17 (September 5, 2021): 5080. http://dx.doi.org/10.3390/ma14175080.

Full text

Abstract:

Ion implantation is a superior post-synthesis doping technique to tailor the structural properties of materials. Via density functional theory (DFT) calculation and ab-initio molecular dynamics simulations (AIMD) based on stochastic boundary conditions, we systematically investigate the implantation of low energy elements Ga/Ge/As into graphene as well as the electronic, optoelectronic and transport properties. It is found that a single incident Ga, Ge or As atom can substitute a carbon atom of graphene lattice due to the head-on collision as their initial kinetic energies lie in the ranges of 25–26 eV/atom, 22–33 eV/atom and 19–42 eV/atom, respectively. Owing to the different chemical interactions between incident atom and graphene lattice, Ge and As atoms have a wide kinetic energy window for implantation, while Ga is not. Moreover, implantation of Ga/Ge/As into graphene opens up a concentration-dependent bandgap from ~0.1 to ~0.6 eV, enhancing the green and blue light adsorption through optical analysis. Furthermore, the carrier mobility of ion-implanted graphene is lower than pristine graphene; however, it is still almost one order of magnitude higher than silicon semiconductors. These results provide useful guidance for the fabrication of electronic and optoelectronic devices of single-atom-thick two-dimensional materials through the ion implantation technique.

APA, Harvard, Vancouver, ISO, and other styles

23

Matherson, K. J., R. D. Glover, D. E. Laban, and R. T. Sang. "Absolute metastable atom-atom collision cross section measurements using a magneto-optical trap." Review of Scientific Instruments 78, no. 7 (July 2007): 073102. http://dx.doi.org/10.1063/1.2754444.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Suzuki, R., H. Sato, and M. Kimura. "Antiproton-hydrogen atom collision at intermediate energy." Computing in Science & Engineering 4, no. 6 (November 2002): 24–33. http://dx.doi.org/10.1109/mcise.2002.1046593.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Elkilany, S. "Charge Exchange of Proton-potassium Atom Collision." Asian Journal of Chemical Sciences 3, no. 2 (January 10, 2017): 1–12. http://dx.doi.org/10.9734/ajocs/2017/36394.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Romero, H. E. "Atom Collision-Induced Resistivity of Carbon Nanotubes." Science 307, no. 5706 (January 7, 2005): 89–93. http://dx.doi.org/10.1126/science.1102004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Kolganova, E. A., A. K. Motovilov, and W. Sandhas. "Scattering Length for Helium Atom-Diatom Collision." Few-Body Systems 38, no. 2-4 (April 24, 2006): 205–8. http://dx.doi.org/10.1007/s00601-005-0137-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

MacGillivray, WR, and MC Standage. "Applications of Lasers to Collision Studies." Australian Journal of Physics 43, no. 5 (1990): 401. http://dx.doi.org/10.1071/ph900401.

Full text

Abstract:

A review is presented of theoretical and experimental aspects of the application of lasers to the field of electron-atom collision physics. Experimental techniques are briefly reviewed and various theoretical treatments of the laser-atom interaction are dealt with in some detail.

APA, Harvard, Vancouver, ISO, and other styles

29

Xia, Zonghuang, Demin Wang, and Shigang Wu. "INVESTIGATION OF VACANCY DISTRIBUTION IN C+−B, C+−N, C+−Be andC+−O ION-ATOM COLLISIONS." International Journal of PIXE 06, no. 01n02 (January 1996): 65–69. http://dx.doi.org/10.1142/s0129083596000089.

Full text

Abstract:

The mechanism of vacancy distribution in C +− B , C +− N , C +− Be , and C +− O ion-atom collision process is studied in this paper based on molecular orbital theory. It translates intensity ratio of X-ray and Auger decay in ion-atom collision process.

APA, Harvard, Vancouver, ISO, and other styles

30

Jachymski, Krzysztof, and Florian Meinert. "Vibrational Quenching of Weakly Bound Cold Molecular Ions Immersed in Their Parent Gas." Applied Sciences 10, no. 7 (March 30, 2020): 2371. http://dx.doi.org/10.3390/app10072371.

Full text

Abstract:

Hybrid ion–atom systems provide an excellent platform for studies of state-resolved quantum chemistry at low temperatures, where quantum effects may be prevalent. Here we study theoretically the process of vibrational relaxation of an initially weakly bound molecular ion due to collisions with the background gas atoms. We show that this inelastic process is governed by the universal long-range part of the interaction potential, which allows for using simplified model potentials applicable to multiple atomic species. The product distribution after the collision can be estimated by making use of the distorted wave Born approximation. We find that the inelastic collisions lead predominantly to small changes in the binding energy of the molecular ion.

APA, Harvard, Vancouver, ISO, and other styles

31

Niranjan, M., Anand Prakash, and S. A. Rangwala. "Analysis of Multipolar Linear Paul Traps for Ion–Atom Ultracold Collision Experiments." Atoms 9, no. 3 (June 29, 2021): 38. http://dx.doi.org/10.3390/atoms9030038.

Full text

Abstract:

We evaluate the performance of multipole, linear Paul traps for the purpose of studying cold ion–atom collisions. A combination of numerical simulations and analysis based on the virial theorem is used to draw conclusions on the differences that result, by considering the trapping details of several multipole trap types. Starting with an analysis of how a low energy collision takes place between a fully compensated, ultracold trapped ion and an stationary atom, we show that a higher order multipole trap is, in principle, advantageous in terms of collisional heating. The virial analysis of multipole traps then follows, along with the computation of trapped ion trajectories in the quadrupole, hexapole, octopole and do-decapole radio frequency traps. A detailed analysis of the motion of trapped ions as a function of the amplitude, phase and stability of the ion’s motion is used to evaluate the experimental prospects for such traps. The present analysis has the virtue of providing definitive answers for the merits of the various configurations, using first principles.

APA, Harvard, Vancouver, ISO, and other styles

32

Mendes, Mónica, Gustavo García, Marie-Christine Bacchus-Montabonel, and Paulo Limão-Vieira. "Electron Transfer Induced Decomposition in Potassium–Nitroimidazoles Collisions: An Experimental and Theoretical Work." International Journal of Molecular Sciences 20, no. 24 (December 6, 2019): 6170. http://dx.doi.org/10.3390/ijms20246170.

Full text

Abstract:

Electron transfer induced decomposition mechanism of nitroimidazole and a selection of analogue molecules in collisions with neutral potassium (K) atoms from 10 to 1000 eV have been thoroughly investigated. In this laboratory collision regime, the formation of negative ions was time-of-flight mass analyzed and the fragmentation patterns and branching ratios have been obtained. The most abundant anions have been assigned to the parent molecule and the nitrogen oxide anion (NO2–) and the electron transfer mechanisms are comprehensively discussed. This work focuses on the analysis of all fragment anions produced and it is complementary of our recent work on selective hydrogen loss from the transient negative ions produced in these collisions. Ab initio theoretical calculations were performed for 4-nitroimidazole (4NI), 2-nitroimidazole (2NI), 1-methyl-4- (Me4NI) and 1-methyl-5-nitroimidazole (Me5NI), and imidazole (IMI) in the presence of a potassium atom and provided a strong basis for the assignment of the lowest unoccupied molecular orbitals accessed in the collision process.

APA, Harvard, Vancouver, ISO, and other styles

33

Siegel, Marshall M., and Norman B. Colthup. "Molecular Orbital Study of Remote Charge Site Decompositions in the Collision-Induced Decomposition Mass Spectra of Fatty Acid Carboxylate Anions." Applied Spectroscopy 42, no. 7 (September 1988): 1214–21. http://dx.doi.org/10.1366/0003702884429887.

Full text

Abstract:

Molecular orbital calculations were used to study the energetics of four different mechanisms used to explain the collision-induced decomposition mass spectra of saturated fatty acid carboxylate anions produced by fast atom bombardment and chemical ionization. The most abundant homologous series of anions, terminally unsaturated carboxylate anions, arose from the concerted cleavage of gauche segments of the hydrocarbon backbone via a sixatom transition state. A series of anions of lower abundance arose by homolytic cleavage of anti segments of the hydrocarbon backbone into two radical fragments. The loss of methane from the parent anion is produced by the concerted cleavage of the terminal methyl group via a four-atom transition state. The computed activation energies for the reaction mechanisms were in the following order: sixatom transition state < four-atom transition state ≪ homolytic cleavage of hydrocarbon backbone. Dehydration of the parent anion is rationalized to occur by loss of a carboxylate oxygen and two hydrogen atoms on the alpha carbon from the carboxylate carbon.

APA, Harvard, Vancouver, ISO, and other styles

34

Melezhik, Vladimir S. "Efficient computational scheme for ion dynamics in RF-field of Paul trap." Discrete and Continuous Models and Applied Computational Science 27, no. 4 (December 15, 2019): 378–85. http://dx.doi.org/10.22363/2658-4670-2019-27-4-378-385.

Full text

Abstract:

We have developed an efficient computational scheme for integration of the classical Hamilton equations describing the ion dynamics confined in the radio-frequency field of the Paul trap. It has permitted a quantitative treatment of cold atom-ion resonant collisions in hybrid atom-ion traps with taking into account unremovable ion micromotion caused by the radio-frequency fields (V.S. Melezhik et. al., Phys. Rev. A100, 063406 (2019)). The important element of the hybrid atom-ion systems is the electromagnetic Paul trap confining the charged ion. The oscillating motion of the confined ion is defined by two frequencies of the Paul trap. It is the frequency of the order of 100 kHz due to the constant electric field and the radio-frequency of about 1-2 MHz defined by the alternating electromagnetic field of the ion trap. The necessity to accurately treat the ion motion in the combined field with two time scales defined by these two very different frequencies has demanded to develop the stable computational scheme for integration of the classical Hamilton equations for the ion motion. Moreover, the scheme must be stable on rather long time-interval of the ion collision with the cold atom ∼ 10 × 2/ defined by the atomic trap frequency ∼ 10 kHz and in the moment of the atom-ion collision when the Hamilton equations are strongly coupled. The developed numerical method takes into account all these features of the problem and makes it possible to integrate the system of coupled quantum-semiclassical equations with the necessary accuracy and quantitatively describes the processes of atomic-ion collisions in hybrid traps, including resonance effects.

APA, Harvard, Vancouver, ISO, and other styles

35

ISHII, KEIZO. "X-RAY PRODUCTION, INNER SHELL IONIZATION AND READING’S THEOREM IN ION · ATOM COLLISIONS." International Journal of PIXE 02, no. 03 (January 1992): 197–209. http://dx.doi.org/10.1142/s0129083592000191.

Full text

Abstract:

When a solid or gaseous target is bombarded with heavy charged particles, inner shell electrons of target atoms are ionized and characteristic x rays are produced. We can easily observe these x rays with a Si(Li) detector and derive inner-shell ionization cross section from the x-ray production cross sections. In this paper, we make a review of x-ray production, inner shell ionization and Reading’s theorem in light ion·atom collisions. This theorem is one of the most important ones in the ion·atom collision physics and permits precise discussion on comparison between experimental inner-shell ionization cross sections obtained with a Si(Li) detector and the calculations based on usual theories where the incident particle is assumed to interact with only one electron in an atom and the presence of other electrons is ignored.

APA, Harvard, Vancouver, ISO, and other styles

36

Yi-Bao, Liu, Pang Wen-Ning, Ding Hai-Bing, and Shang Ren-Cheng. "Indirect Relativistic Effect in Electron–Alkali-Atom Collision." Chinese Physics Letters 22, no. 5 (April 14, 2005): 1041–44. http://dx.doi.org/10.1088/0256-307x/22/5/004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Demkov, Yu N., and V. N. Ostrovsky. "Enhanced backscattering in antiproton-atom collision: Coulomb glory." Journal of Physics B: Atomic, Molecular and Optical Physics 34, no. 18 (September 12, 2001): L595—L599. http://dx.doi.org/10.1088/0953-4075/34/18/102.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Napari, Ismo, Hanna Vehkamäki, and Kari Laasonen. "Molecular dynamic simulations of atom–cluster collision processes." Journal of Chemical Physics 120, no. 1 (January 2004): 165–69. http://dx.doi.org/10.1063/1.1628675.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Ray, Hasi. "Ionization of positronium (Ps) in collision with atom." physica status solidi (c) 6, no. 11 (November 2009): 2281–84. http://dx.doi.org/10.1002/pssc.200982113.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Ramm, U., O. Jagutzki, G. Kraft, and H. Schmidt-Böcking. "λ-Electron emission from heavy ion atom collision." Radiation Effects and Defects in Solids 126, no. 1-4 (March 1993): 73–76. http://dx.doi.org/10.1080/10420159308219682.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Hu, Xiche, and Craig C. Martens. "Atom–cluster interaction potentials and thermal collision rates." Journal of Chemical Physics 99, no. 4 (August 15, 1993): 2654–60. http://dx.doi.org/10.1063/1.465228.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Sheinerman, S. A. "Post-collision interaction in inelastic ion-atom scattering." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 86, no. 1-2 (March 1994): 105–18. http://dx.doi.org/10.1016/0168-583x(94)96157-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Wang, Xin, Jun He, Jiandong Bai, and Junmin Wang. "Rydberg Level Shift due to the Electric Field Generated by Rydberg Atom Collision Induced Ionization in Cesium Atomic Ensemble." Applied Sciences 10, no. 16 (August 14, 2020): 5646. http://dx.doi.org/10.3390/app10165646.

Full text

Abstract:

We experimentally studied the Rydberg level shift caused by the electric field, which is generated by Rydberg atom collision induced ionization in a cesium atomic ensemble. The density of charged particles caused by collisions between Rydberg atoms is changed by controlling the ground-state atomic density and optical excitation process. We measured the Rydberg level shift using Rydberg electromagnetically-induced-transparency (EIT) spectroscopy, and interpreted the physical origin using a semi-classical model. The experimental results are in good agreement with the numerical simulation. These energy shifts are important for the self-calibrated sensing of microwave field by the employing of Rydberg EIT. Moreover, in contrast to the resonant excitation case, narrow-linewidth spectroscopy with high signal-to-noise ratio would be useful for high-precision measurements.

APA, Harvard, Vancouver, ISO, and other styles

44

Alcalá Varilla, L. A., D. L. Pérez Pitalua, and F. Torres Hoyos. "Modeling a helium atom from a collision of an electron with an ionized helium atom." Journal of Physics: Conference Series 1386 (November 2019): 012119. http://dx.doi.org/10.1088/1742-6596/1386/1/012119.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Golubkov, G. V., A. Z. Devdariani, and M. G. Golubkov. "Collision of Rydberg atom A** with atom B in the ground electronic state. Optical potential." Journal of Experimental and Theoretical Physics 95, no. 6 (December 2002): 987–97. http://dx.doi.org/10.1134/1.1537291.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Braga, J. P., L. J. Dunne, and J. N. Murrell. "A comparison of classical and quantal transition probabilities for a non-adiabatic atom-atom collision." Chemical Physics Letters 120, no. 2 (October 1985): 147–50. http://dx.doi.org/10.1016/0009-2614(85)87030-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Verdasco, E., M. Menéndez, M. Garay, A. González Ureña, O. Benoist D'azy, F. J. Poblete, and G. Taïeb. "Reaction Dynamics of Electronically Excited Calcium Atom." Laser Chemistry 12, no. 1-2 (January 1, 1992): 123–36. http://dx.doi.org/10.1155/lc.12.123.

Full text

Abstract:

Absolute values of the total chemiluminescence cross-section for the beam-gas Ca(3P, 1D) + Cl4C → CaCl(A, B) + Cl3C and Ca(3P, 1D) + SF6 → CaF(A, B) + SF5 reactions have been measured at low collision energy, ET = 0.15 and 0.14eV, respectively. Both metastable atomic calcium states Ca(3P, 1D) were produced under low voltage dc-discharge conditions. By changing the discharge conditions, different metastable concentrations were produced to measure the state-to-state cross-section for both 3P and 1D reactions. The following values for the total chemiluminescence cross-sections were obtained:σD1 = 1.77 Å and σP3 = 0.25 Å for the Ca(3P, 1D) + Cl4C → CaCl(A, B) + Cl3C reaction.σD1 = 0.59 Å2 and σP3 = 0.56 Å2 for the Ca(3P, 1D) + SF6 → CaF(A) + SF5 reaction.σD1 = 0.04 Å2 and σP3 = 0.12 Å for the Ca(3P, 1D) + SF6 → CaF(B) + SF5 reaction.In addition, beam-beam experiments were carried out at the same average low collision energy that of the beam-gas, and therefore, normalization between both experiments was possible. This procedure allowed us to obtain the excitation function of the Ca(1D) + SF6 reaction in absolute values over the 0.15–0.60eV collision energy range.On the other hand, by simulation, the ratio of CaCl(B-X/A-X) emissions intensities was found to be of 0.15. The variation of this ratio with the relative concentration of 1D/3P in a Broida oven leads to the conclusion that this state favours the formation of the B state in the chemiluminescent Ca(3P, 1D) + CH3CHCl2 → CaCl(A, B) + CH3CHCl reaction.

APA, Harvard, Vancouver, ISO, and other styles

48

Víkor, Gy, L. Víkor, and L. Gulyás. "Post-collision effects in the beam direction in fast ion-atom collisions." Journal of Physics B: Atomic, Molecular and Optical Physics 32, no. 14 (July 20, 1999): 3317–30. http://dx.doi.org/10.1088/0953-4075/32/14/303.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Bartschat, K., and D. H. Madison. "Connection between superelastic and inelastic electron-atom collisions involving polarized collision partners." Physical Review A 48, no. 1 (July 1, 1993): 836–37. http://dx.doi.org/10.1103/physreva.48.836.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Emoto, Masahiko, Izumi Murakami, Daiji Kato, Masanobu Yoshida, Masatoshi Kato, and Setsuo Imazu. "Improvement of the NIFS Atom and Molecular Database." Atoms 7, no. 3 (September 11, 2019): 91. http://dx.doi.org/10.3390/atoms7030091.

Full text

Abstract:

The NIFS (National Institute for Fusion Science) Atom and Molecular Database, which has been available online since 1997, is a numerical atomic and molecular database of collision processes that is important for fusion research. This database provides the following: (1) the cross-sections and rate coefficients for ionization, excitation, and recombination caused by electron impact; (2) the charge transfer caused by heavy particle collision and collision processes of molecules; and (3) the sputtering yields of solids and backscattering coefficients from solids. It also offers a bibliographic database. We recently reconstructed the database system. The main purpose of the reconstruction was to migrate the database into an open-source architecture to make the system more flexible and extensible. The previous system used proprietary software and was difficult to customize. The new system consists of open-source software, including PostgreSQL database and Ruby on Rails. New features were also added to the system. The most important improvement is the interface with the Virtual Atomic and Molecular Data Center (VAMDC) portal. Using this interface, researchers can search for data in the NIFS database as well as in various other online databases simultaneously.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!