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Journal articles on the topic 'Collision atome atome'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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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.

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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.

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2

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

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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

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3

EL-BAKRY, SALAH YASEEN, and AMR RADI. "DISCOVERED FUNCTION FOR POSITRON COLLISIONS WITH ALKALI-METAL ATOMS USING GENETIC PROGRAMMING." International Journal of Modern Physics C 18, no. 03 (2007): 351–58. http://dx.doi.org/10.1142/s0129183107009480.

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Genetic programming (GP) has been used to discover the function that describes the collisions of positrons with sodium, potassium, rubidium and cesium atoms at low and intermediate energies. The GP has been running based on experimental data of the total collisional cross sections to produce the total cross sections for each target atom. The incident energy and the static dipole polarizability of the alkali target atom have been used as input variables to find the discovered function. The experimental, calculated and predicted total collisional cross sections are compared. The discovered funct

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4

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.

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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 proce

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5

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

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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 m

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6

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

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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

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7

Sawant, Rahul, Anna Maffei, and Giovanni Barontini. "Thermalization of a Trapped Single Atom with an Atomic Thermal Bath." Applied Sciences 11, no. 5 (2021): 2258. http://dx.doi.org/10.3390/app11052258.

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We studied a single atom trapped in an optical tweezer interacting with a thermal bath of ultracold atoms of a different species. Because of the collisions between the trapped atom and the bath atoms, the trapped atom undergoes changes in its vibrational states occupation to reach thermal equilibrium with the bath. By using Monte Carlo simulations, we characterized the single atom’s thermalization process, and we studied how this can be used for cooling. Our simulations demonstrate that, within known experimental limitations, it is feasible to cool a trapped single atom with a thermal bath.

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8

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 (2009): 5867–80. http://dx.doi.org/10.1142/s0217979209054818.

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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 incr

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9

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

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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

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10

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

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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

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11

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.

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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 f

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12

Kalogerakis, K. S., T. G. Slanger, E. A. Kendall, et al. "Remote Oxygen Sensing by Ionospheric Excitation (ROSIE)." Annales Geophysicae 27, no. 5 (2009): 2183–89. http://dx.doi.org/10.5194/angeo-27-2183-2009.

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Abstract. The principal optical observable emission resulting from ionospheric modification (IM) experiments is the atomic oxygen red line at 630 nm, originating from the O(1D–3P) transition. Because the O(1D) atom has a long radiative lifetime, it is sensitive to collisional relaxation and an observed decay faster than the radiative rate can be attributed to collisions with atmospheric species. In contrast to the common practice of ignoring O-atoms in interpreting such observations in the past, recent experimental studies on the relaxation of O(1D) by O(3P) have revealed the dominant role of

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13

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.

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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 regi

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14

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 (1996): 949–54. http://dx.doi.org/10.1142/s0218625x96001704.

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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 mod

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15

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 (2019): 6170. http://dx.doi.org/10.3390/ijms20246170.

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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

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16

Trautmann, D., and G. Baur. "Theory of alignment of atoms following ion-atom collisions." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 40-41 (April 1989): 345–49. http://dx.doi.org/10.1016/0168-583x(89)90994-4.

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17

Yang, Huan, De-Chao Zhang, Lan Liu, et al. "Observation of magnetically tunable Feshbach resonances in ultracold 23Na40K + 40K collisions." Science 363, no. 6424 (2019): 261–64. http://dx.doi.org/10.1126/science.aau5322.

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Resonances in ultracold collisions involving heavy molecules are difficult to simulate theoretically and have proven challenging to detect. Here we report the observation of magnetically tunable Feshbach resonances in ultracold collisions between potassium-40 (40K) atoms and sodium-23–potassium-40 (23Na40K) molecules in the rovibrational ground state. We prepare the atoms and molecules in various hyperfine levels of their ground states and observe the loss of molecules as a function of the magnetic field. The atom-molecule Feshbach resonances are identified by observing an enhancement of the l

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18

Sharma, Bhupat, and Man Mohan. "Excitation of Atomic Hydrogen by Proton Impact in the Presence of a Resonant Laser Field Using the First Order Magnus Approximation." Australian Journal of Physics 45, no. 1 (1992): 47. http://dx.doi.org/10.1071/ph920047.

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We consider proton collisions from hydrogen atoms in the presence of a laser beam (taken in the electric dipole approximation) that resonantly (or nearly resonantly) excites the hydrogen atoms from the Is to the 2p state. The laser beam is linearly polarised with polarisation either parallel (longitudinal) or perpendicular (transverse) to the direction of incidence of the proton. A non-perturbative quasi-energy approach is used to describe the laser-atom interaction, while the first-order Magnus approximation is used to describe the collision dynamics in the presence of the nearly resonant las

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19

Guerlin, Th, H. Niedrig, and M. Sternberg. "Investigation of Ion Beam Sputter Mechanisms by Electron Beam Techniques." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (1990): 386–87. http://dx.doi.org/10.1017/s0424820100135538.

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The mechanisms of unisotropic atomic emission from single crystals under ion bombardment (Ar+, E < 25keV) have been investigated by depositing the sputtered atoms in a semi-spherical collector. A subsequent determination of the thickness distributions of the deposited films by electron backscattering gives the total angular atomic emission distribution, showing maxima in certain crystallographic directions of the sputtered target crystal: Wehner spots.Several mechanisms for the appearance of spot patterns are discussed in the literature:1.For normal incidence of the ions collision cascades

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20

Wang, L. J., M. King, and T. J. Morgan. "Fast Rydberg hydrogen atom collisions with neutral atoms and molecules." Journal of Physics B: Atomic and Molecular Physics 19, no. 18 (1986): L623—L628. http://dx.doi.org/10.1088/0022-3700/19/18/006.

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21

Fung, Yin, Alicia Carpentier, Pimonpan Sompet, and Mikkel Andersen. "Two-Atom Collisions and the Loading of Atoms in Microtraps." Entropy 16, no. 1 (2014): 582–606. http://dx.doi.org/10.3390/e16010582.

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22

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 (2020): 5646. http://dx.doi.org/10.3390/app10165646.

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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

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23

Rasul, Bilal, and Aroog G. "Interaction of Small Hydrocarbons with Fusion Relevant Beryllium Thin Films." July 2021 40, no. 3 (2021): 539–44. http://dx.doi.org/10.22581/muet1982.2103.08.

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Ion-surface collision studies are carried out with small deuterated hydrocarbon cations i.e. CDx + with x = 2-4 colliding with fusion relevant Beryllium (Be) thin films with ions incident energy as low as 0 eV and as high as Ein = 100 eV. Be films are coated on stainless steel surface by the technique of Thermionic Vacuum Arc (TVA); a novel thin film deposition method with primary as well distinguished characteristic of control of ion flux and respective dose towards the substrate. Prior to scattering, methane-d4 99 atom % D is ionized by electron impact and ions are mass and energy analyzed.

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24

MALIK, A. A., та I. S. SATSUNKEVICH. "PRODUCTION OF (τ+τ-) IN ELECTRON–POSITRON COLLISIONS". International Journal of Modern Physics A 24, № 20n21 (2009): 4039–44. http://dx.doi.org/10.1142/s0217751x09046813.

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(τ+τ-) is an atom of simple hydrogenlike structure similar to positronium (e-e+) and (μ+μ-). In this paper energy levels and decay widths of different decay channels of (τ+τ-) are given. Cross-section of production of this atomic system in e-e+ annihilation taking into account radiative corrections is calculated. According to our estimates 31 (τ+τ-) atoms are produced at VEPP-4M and 943 (τ+τ-) atoms may be produced at BEPCII under the present experimental conditions.

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25

Colonna, G., L. D. Pietanza, and G. D’Ammando. "Self-consistent collisional-radiative model for hydrogen atoms: Atom–atom interaction and radiation transport." Chemical Physics 398 (April 2012): 37–45. http://dx.doi.org/10.1016/j.chemphys.2011.06.019.

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26

Zhang, Zhi-Qiang, Zhang-Ming He, Peng Miao, and Y. H. Zhou. "Collision dynamics of two bright solitons in growth Bose–Einstein condensates with tunable interactions." International Journal of Modern Physics B 33, no. 23 (2019): 1950261. http://dx.doi.org/10.1142/s0217979219502618.

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By using the split-step fast Fourier transform (SSFFT) method, we numerically study the collision properties between two bright solitons in the growth Bose–Einstein condensates (BECs) with different interaction strengths under a harmonic potential. It is shown that the soliton’s collision property of the condensates can be controlled by adjusting the gain term, the initial position and the interaction strength between atoms. The number of collisions of the two bright solitons decreases first, then increases, with increasing the values of the gain term. As the initial distance between solitons

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27

SHLYAPNIKOV, G. V. "SUPERFLUID REGIMES IN DEGENERATE ATOMIC FERMI GASES." International Journal of Modern Physics B 20, no. 19 (2006): 2739–54. http://dx.doi.org/10.1142/s0217979206035242.

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We give a brief overview of recent studies of quantum degenerate regimes in ultracold Fermi gases. The attention is focused on the regime of Bose-Einstein condensation of weakly bound molecules of fermionic atoms, formed at a large positive scattering length for the interspecies atom-atom interaction. We analyze remarkable collisional stability of these molecules and draw prospects for future studies.

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28

Yu Dehong, Liu Jiarui, Lei Ziming, et al. "Target-atom excitations in the collisions ofHe2+ions with Na atoms." Physical Review A 39, no. 6 (1989): 2931–32. http://dx.doi.org/10.1103/physreva.39.2931.

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29

Gettys, Nancy S., Lionel M. Raff, and Donald L. Thompson. "Atom exchange reactions in collisions of noble gas atoms and dimers." Journal of Physical Chemistry 92, no. 18 (1988): 5270–72. http://dx.doi.org/10.1021/j100329a040.

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30

Schuller, F., and G. Nienhuis. "Joint effect of N-atom coherences, saturation broadening, and collisions on absorption profiles of two-level atoms." Canadian Journal of Physics 63, no. 5 (1985): 551–56. http://dx.doi.org/10.1139/p85-086.

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We consider the Dicke model for cooperative decay of N two-level atoms confined to a very small volume assuming moreover that this system is submitted to a strong monochromatic driving field. We study the influence of foreign-atom collisions on the corresponding absorption profile by taking into account the simultaneous action of collisions, multiatom coherence, and saturation effects. In the case of a two-atom system we calculate the profile exactly by especially avoiding the secular approximation introduced in previous work. In the N-atom case we discuss both the low-intensity and the large-

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31

Kabachnik, N. M., V. N. Kondratyev, Z. Roller-Lutz, and H. O. Lutz. "Multiple ionization of atoms and molecules in collisions with fast ions: Ion-atom collisions." Physical Review A 56, no. 4 (1997): 2848–54. http://dx.doi.org/10.1103/physreva.56.2848.

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32

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.

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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.

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33

Desfrancois, C., J. P. Astruc, R. Barbe, A. Lagreze, and J. P. Schermann. "Electron Transfer Collisions of Excited Sodium Atoms and Oxygen Molecules." Laser Chemistry 6, no. 1 (1986): 1–14. http://dx.doi.org/10.1155/lc.6.1.

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The vibronic network model is here considered for excited sodium atoms and oxygen molecules collisions. Electronic to vibration transfer and reaction cross sections are computed with a single adjustable parameter : the ionic covalent matrix element. The comparison between the atom-molecule and the quasi-free electron models is presented.

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

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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 i

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Chen, Zhen, Jun Chen, Rongjun Chen, et al. "Reactivity oscillation in the heavy–light–heavy Cl + CH4 reaction." Proceedings of the National Academy of Sciences 117, no. 17 (2020): 9202–7. http://dx.doi.org/10.1073/pnas.1917618117.

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It has long been predicted that oscillatory behavior exists in reactivity as a function of collision energy for heavy–light–heavy (HLH) chemical reactions in which a light atom is transferred between two heavy atoms or groups of atoms, but direct observation of such a behavior in bimolecular reactions remains a challenge. Here we report a joint theoretical and crossed-molecular-beam study on the Cl + CH4 → HCl + CH3 reaction. A distinctive peak at a collision energy of 0.15 eV for the CH3(v = 0) product was experimentally detected in the backward scattering direction. Detailed quantum-dynamics

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36

Pranevičius, L. L., Claude Templier, and Donatas Mickevičius. "Self-Formation Processes in Studies of Surface Topography under Ion Irradiation." Solid State Phenomena 97-98 (April 2004): 165–72. http://dx.doi.org/10.4028/www.scientific.net/ssp.97-98.165.

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Surface atoms are activated as result of replacement collisional sequences in solids by incident ions. In dependence on theirs threshold (displacement) energy and angular distribution they may be sputtered (removed) or laterally relocated on the surface. The relocation length distribution depends on the energy and angular distributions of activated atoms and interaction atom-solid potential. The process of lateral relocation of surface atoms is considered as a sequence of stochastic removal and adsorption processes. The rate equations describing processes of sputtering, relocation and thermal

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37

Кислов, К. С., А. А. Нариц та В. С. Лебедев. "Анализ эффективностей процессов захвата электронов ионами в ридберговские состояния и неупругих переходов n n-=SUP=--=/SUP=- в плазме смесей инертных газов". Журнал технической физики 128, № 4 (2020): 462. http://dx.doi.org/10.21883/os.2020.04.49195.319-19.

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We have carried out the comparative analysis of the efficiencies of resonant and non-resonant mechanisms of electron capture by ions into Rydberg states of atoms, Xe(n), and the inelastic n → n′ transitions between the highly-excited states in the plasmas of rare gas mixtures, Rg/Xe, containing atomic, Xe$^{+}$, and molecular, RgXe$^{+}$ and Xe$_{2}^{+}$, ions (Rg = Ne, Ar and Kr, [Xe]≪[Rg]). The rate constants of resonant electron capture by Xe$^{+}$ ions in ternary collisions with rare gas atoms, Rg($^{1}S_{0}$), and dissociative recombination of heteronuclear, RgXe$^{+}$, and homonuclear, X

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38

Henry, Megan E., and Roger M. Herman. "Collisional broadening of Rydberg-atom transitions by ground-state alkali atoms." Journal of Physics B: Atomic, Molecular and Optical Physics 35, no. 2 (2002): 357–72. http://dx.doi.org/10.1088/0953-4075/35/2/312.

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39

Abel, Martin, Lothar Frommhold, Xiaoping Li, and K. L. C. Hunt. "Comparison of the Calculated Collision-Induced Absorption Spectra by Dense Hydrogen-Helium, Deuterium-Helium, and Tritium-Helium Gas Mixtures." Journal of Atomic, Molecular, and Optical Physics 2011 (October 11, 2011): 1–3. http://dx.doi.org/10.1155/2011/470530.

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We have recently determined the induced dipole surface (IDS) and potential energy surface (PES) of collisional H2-He complexes. We have used these surfaces to compute the binary collision-induced absorption spectra of H2 molecules interacting with He atoms and of D2 molecules interacting with He atoms. Here we extend these calculations to the case of T2 molecules interacting with He atoms. Whereas the electronic structure of X2-He is virtually the same for all hydrogen isotopes X = H, D, or T, the collisional dynamics and molecular scattering wave functions are different for the different coll

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40

Goldstein, R., C. Figl, J. Grosser, et al. "Collision photography: Polarization imaging of atom-molecule collisions." Journal of Chemical Physics 121, no. 18 (2004): 8769–74. http://dx.doi.org/10.1063/1.1799592.

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41

Hird, B., M. Bruyère, S. Fafard, and M. W. Orakzai. "Cross sections for phosphorous negative-ion detachment in collisions with rare gas atoms." Canadian Journal of Physics 66, no. 9 (1988): 810–12. http://dx.doi.org/10.1139/p88-132.

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Stwalley, William C. "Collisions and reactions of ultracold molecules." Canadian Journal of Chemistry 82, no. 6 (2004): 709–12. http://dx.doi.org/10.1139/v04-035.

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It is argued that collision dynamics of atoms and molecules at ultracold temperatures (below 1 mK) are not readily predictable from knowledge of collision dynamics above 100 K. In the case of elastic collisions, it is well known that the collision cross section is constant as T → 0 K but mass and symmetry effects are dramatic. The cases of inelastic and reactive collisions are less studied, but a T1/2 dependence of the cross section as T → 0 K is expected. It seems that extrapolations of high-temperature inelastic and reactive behavior normally greatly underestimate ultracold-temperature rate

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Luo, Mingmin, Yujia Zhai, Guannan Guo, and Xuemei Zhang. "Experimental study on electron detachment cross sections of Cl– in collisions with inert gas atoms." Canadian Journal of Physics 98, no. 3 (2020): 287–90. http://dx.doi.org/10.1139/cjp-2018-0928.

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The single-electron and double-electron detachment cross sections of Cl– in collision with inert gas atoms (He–Xe) have been measured by the growth rate method. The incident negative ions’ energies are from 5 to 30 keV. It is found that the single-electron detachment cross sections become greater and greater when the target atoms change from helium to xenon. However, double-electron detachment cross sections show a more complicated relationship with the target atom changing. The results of this work have been compared with the previous data, and a model based on energy division is used to inte

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44

WANG, JIANYI. "RECENT PROGRESS ON MASS TRANSFER IN SEMICLASSICAL SYSTEMS." Modern Physics Letters B 09, no. 21 (1995): 1333–45. http://dx.doi.org/10.1142/s0217984995001327.

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We present a brief review of recent progress in the transfer of an electron from a circular Rydberg atom to an impinging ion. This field has attracted considerable interest since the "exotic" semiclassical properties of these atoms afford an opportunity to study mass transfer in a regime where dynamic pathways can be well controlled. We report developments in the past two years in electron transfer between oriented circular Rydberg atoms and protons at collision speeds comparable to the electron orbital speed. Newly discovered results have solved a number of outstanding puzzles in the classica

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EL-BAKRY, SALAH YASEEN, and AMR RADI. "GENETIC PROGRAMMING APPROACH FOR ELECTRON-ALKALI-METAL ATOM COLLISIONS." International Journal of Modern Physics B 20, no. 32 (2006): 5463–71. http://dx.doi.org/10.1142/s0217979206035825.

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New technique is presented for modeling the total cross sections of electron scattering by Na, K, Rb and Cs atoms in the low and intermediate energy regions. The calculations have been performed in the framework of genetic programming (GP) technique. The GP has been running based on the experimental data of the total collisional cross sections to produce the total cross sections for each target atom. The incident energy and atomic number as well as the static dipole polarizability have been used as input variables to find the functions that describe the total collisional cross sections of the

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46

Rizzini, E. Lodi. "First protonium production in a nested Penning trap and related topics." Canadian Journal of Physics 85, no. 5 (2007): 461–67. http://dx.doi.org/10.1139/p07-016.

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After the synthesis of antihydrogen, the ATHENA collaboration has succeeded in the synthesis of protonium (a [Formula: see text] atom). The synthesis occurs at the "chemical" energy scale and we observe free protonium atoms with kinetic energies in the range 1–700 meV. We show that in the ATHENA apparatus protonium atoms with lifetime of the order of 1 µs have been produced after collisions with [Formula: see text] inside the e+ cloud in the nested Penning trap. This result could open a new scenario about measurements in fundamental physics.PACS Nos.: 36.10-k, 34.80.Lx, and 52.20.Hq

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Hoogerland, MD, D. Milic, W. Lu, H.-A. Bachor, KGH Baldwin, and SJ Buckman. "Production of Ultrabright Slow Atomic Beams Using Laser Cooling." Australian Journal of Physics 49, no. 2 (1996): 567. http://dx.doi.org/10.1071/ph960567.

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We propose to use a three-step transverse and longitudinal cooling scheme, to compress and collimate a strongly diverging flow of metastable rare gas atoms. Simulations show that an atom beam flux of 1010 8−1 in a small diameter (−1 ) atomic beam could be achieved. This technique can be extremely valuable in many areas of atomic physics, e.g. in (electron) spectroscopy and atomic collision physics where high beam densities are desirable.

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SHAPIRO, M. H., and T. A. TOMBRELLO. "SIMULATION OF ENERGETIC CLUSTER IMPACTS ON METALLIC TARGETS." Modern Physics Letters B 05, no. 05 (1991): 341–49. http://dx.doi.org/10.1142/s021798499100040x.

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We review recent progress in the use of molecular dynamics (MD) simulations to study the energetic collisions of cluster ions with metallic surfaces. MD simulations have been used to predict the energy, number-density, and confinement-time properties of the highly nonlinear collision cascades initiated by cluster impacts; as well as to predict the yields, energy-distributions, and angle-distributions of ejected cluster-atoms and target-atoms.

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Zhu, Zhen Zheng, Richard W. P. White, David J. Smith, and Roger Grice. "Transition state dynamics of F + Br2 reactive scattering." Canadian Journal of Chemistry 72, no. 3 (1994): 523–28. http://dx.doi.org/10.1139/v94-076.

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Reactive scattering of F atoms with Br2 molecules has been studied at an initial translational energy E ∼ 16 kJ mol−1 using a supersonic beam of F atoms seeded in Ne buffer gas. Laboratory angular and velocity distributions of BrF product have been measured. They show sharp peaking in the forward direction with almost isotropic wide angle scattering of relative intensity ∼ 0.2. Approximately half the total available energy is disposed into product translation for scattering in the forward and backward directions with slightly lower translational energy for the sideways scattering. The combinat

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Belkić, Dževad. "Post-collisional interaction in ion-atom collisions." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 86, no. 1-2 (1994): 127–34. http://dx.doi.org/10.1016/0168-583x(94)96159-x.

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