Relevant bibliographies by topics / Collision atome atome

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Academic literature on the topic 'Collision atome atome'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Collision atome atome"

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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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.

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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 spontaneous decay is exothermic and endothermic.
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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 (March 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 function shows a good match to the experimental data. We find that the GP technique is able to improve upon more traditional methods. To our knowledge, this is the first application of the GP technique to the data of positron collisions with alkali atoms at low and intermediate energies.
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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 process.
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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.

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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 mass ratio is discussed. PACS No.: 79.20-m
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6

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.

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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 of the atomic states by the laser field can affect the collision cross sections.
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Sawant, Rahul, Anna Maffei, and Giovanni Barontini. "Thermalization of a Trapped Single Atom with an Atomic Thermal Bath." Applied Sciences 11, no. 5 (March 4, 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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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.

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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 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.
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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.

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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 the distorted wave Born approximation. We find that the inelastic collisions lead predominantly to small changes in the binding energy of the molecular ion.
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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.

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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 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.
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Dissertations / Theses on the topic "Collision atome atome"

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Masseron-Pommier, Jacqueline. "Étude d'un faisceau d'hélium métastable : production et destruction par collision sur cible gazeuse." Paris 11, 1986. http://www.theses.fr/1986PA112251.

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Première détermination expérimentale, par temps de vol, de la proportion d'atomes métastables he(2**(1)s) et he(2**(3)s) produits par échange de charge entre he**(+) et des vapeurs d'alcalins(na,k,rb,cs). Description de cet échange de charge, intervenant a grandes distances internucléaires, par des fonctions d'onde moléculaires de la méthode de la liaison de valence projetée; détermination des sections efficaces par la méthode du couplage fort a plusieurs états. Mesure de l'excitation de l'électron externe et de l'échange de charge cœur - cœur en fonction de l'angle de déflection: faible contribution aux sections efficaces totales. Analyse du comportement angulaire des sections efficaces différentielles réduites pour les canaux d'échange he*(2**(1,3)s) et he*(2**(3)p) et déduction de l'importance relative des couplages primaires sigma -sigma et sigma -pi. Etude de la collision superplastique he(2**(1)s) + he(1s**(2)) -> he(1s**(2)) + he(1s**(2)) et de diffusions inélastiques de he*(2**(3)s) sur he,ar,d (2),o (2) : accord de l'abondance de he(2**(3)p) avec les calculs bases sur le couplage rotationnel c**(3)sigma (g)**(+) -b'**(3)pi g); population des états des rydberg he(nl) par la transition ionique-covalente dans la molécule he (2).
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Quichaud, Viviane. "Etude des processus elementaires : de synthese de la molecule no, en post-decharge en ecoulement, de collisions titane-gaz rares, titane-molecules, par perturbation laser resolue en temps." Paris 6, 1987. http://www.theses.fr/1987PA066135.

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I. Etude de la preparation des etats excites de no dans un dispositif de post-decharge en ecoulement a partir de n::(2) excite (prepare par transfert d'excitation a partir d'atomes ar metastables dans une decharge basse pression) et de o (obtenu par dissociation de o::(2) dans une decharge de he). Observation d'une emission intense des bandes gamma de no, qui implique un etat a courte duree de vie (b) de n::(2) et le premier etat metastable de o. Ii. Analyse des processus d'extinction et de transfert d'excitation a partir d'etats a courte duree de vie de ti (crees dans un dispositif a cathode creuse) lors de collisions avec des gaz rares (ar, ne, he) et des molecules (n::(2),h::(2)). Ces experiences permettent l'etude de cinetiques de reactions elementaires au sein d'un plasma basse pression ensemence de vapeurs metalliques, a l'aide du dispositif de post-decharge en ecoulement
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Féron, Patrice. "Étude par des techniques de jets croisés et d'analyse laser de collisions aux énergies thermiques entre atomes métastables (Ne*, He*) et atomes (Ne, He, Ar) ou molécules (N₂, O₂, NO) à l'état fondamental." Paris 11, 1988. http://www.theses.fr/1988PA112281.

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Étude par deux techniques: 1) analyse de temps de vol soit mécanique, soit par dépopulation sélective au moyen d'un laser à colorant accordable ; 2) analyse continue d'état et de vitesse, au moyen d'un laser, pour séparer les vitesses finales, avec deux faisceaux supersoniques. Application à l'étude de la diffusion élastique ne(3)p(0,2)-he par ces deux techniques, des transferts d'énergie d'excitation he(2(1)s)-ne par la 2eme technique, de l'échange de métastabilité pour le système ne-ne sans analyse laser. Bon accord des résultats expérimentaux avec le calcul jwkb des sections efficaces et leur analyse en harmoniques sphériques. Expériences de collisions avec effet penning pour ne avec ar, n(2), no et o(2) : atténuation de l'effet arc-en-ciel pour les molécules, interaction forte et très anisotrope de o(2) et no avec l'état ionique (a(+) + b(-).
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Karam, Jean-Christophe. "Collision d'un atome métastable de gaz rare sur une surface nano ou micro-structurée et optique atomique." Phd thesis, Université Paris-Nord - Paris XIII, 2005. http://tel.archives-ouvertes.fr/tel-00383051.

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Dans cette thèse, on a montré l'occurrence de transitions exothermiques et endothermiques entre les niveaux métastables 3P_2 et 3P_0 dans la collision d'atomes de gaz rare avec une surface solide. Le développement d'une source d'atomes métastables utilisant le processus d'échange de métastabilité au sein d'un jet supersonique a permis ensuite d'observer la diffraction par un réseau de nanofentes, puis, dans une expérience de collision sur un réseau micrométrique en Cuivre en présence d'un champ magnétique externe, d'observer des transitions Zeeman au sein du niveau 3P_2. Le calcul, à partir des données spectroscopiques, de l'interaction de van der Waals entre un atome d'argon métastable dans l'état 3P_2 et une surface conductrice plane a révélé outre une partie scalaire, une partie quadrupolaire modifiant l'énergie des sous niveaux au voisinage de la surface. Un modèle d'évolution soudaine prédit alors une probabilité de transition dont l'ordre de grandeur est en accord avec l'expérience.
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Astruc, Jean-Pierre. "Transfert d'électron entre atomes excités et molécules dans une expérience en jets croisés avec fluorescence résolue dans le temps." Paris 13, 1987. http://www.theses.fr/1987PA132020.

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Etude experimentale avec résolution temporelle à l'échelle de la nanoseconde des valeurs absolues des séctions efficaces pour les transferts partiels d'énergie électronique entre Na(4d) et He, Ar, N(2), O(2), N(2)o et SF(6). Développement quantitatif de deux modèles à intermediaire ionique : réseau de multicroisement et diffusion résonnants atome excité-molecule. Emploi de l'approximation d'impact avec correction d'effet de coeur pour la transfert de moment orbital na(4d -> 4f)
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Djerad, Mohamed Tahar. "Étude de l'ionisation collisionnelle mettant en jeu des états excités dans un mélange potassium-rubidium, à énergie thermique." Paris 11, 1987. http://www.theses.fr/1987PA112331.

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Cette étude porte essentiellement sur les collisions ionisantes mettant en jeu des états excités dans un mélange de vapeurs saturantes K-Rb, à énergie thermique. La méthode expérimentale consiste en l'excitation laser continue et résonnante en deux étapes des états de Rydberg intermédiaires (n 10) et l'analyse par spectrométrie de masse du courant d'ions. La relaxation radiative et colli­ sionnelle des atomes engendre un milieu complexe. Les processus collisionnels les plus efficaces sont l'ionisation Penning et l'ionisation Hornbeck-Molnar. Dans le système hétéronucléaire Rb(nl) + K(4P) on pourrait s'attendre aux voies de sortie : Rb(nl) + K(4P) -- + e+ K + e + Rb + e. Les mesures montrent que la première voie a une section efficace moyenne de 10-13 cm2. Celles des autres sont au moins trois ordres de grandeurs plus petites et sont donc comparativement négligeables. L'ensemble des résultats obtenus à partir des niveaux 50 à lOS permet de montrer que le flux de la voie d'entrée s'ionise à grande séparation entre Rb(nl) et K(4P). Le processus d'ionisation est dominé par les forces de polarisation, les forces d'échange étant comparativement négligeables. Dans le présent mélange, l'ionisation Hornbeck- Molnar conduit à la formation d'ions homonucléaires K2+, Rb2+ et hétéronucléaires KRb+. Nous avons mesuré les taux de réaction dans les systèmes K ( nl) + Rb--KRb+ + e Rb(nl) + K--KRb+ + e-. Les taux de réaction augmentent avec l'énersie d'excitation de l'état nl, ils ne présentent pas de différences fondamentales avec ceux connus dans les alcalins en phase vapeur pure
This study concerns mainly ionising collisions involving excited states in a saturated mixture of K-Rb vapours, at thermal energy. The experimental method consists into continuous resonant two steps laser excitation of the atoms (n < 10) and mass spectrometry of ion currents. Radiative and collisional relaxation of the atoms create a complex medium. The most efficient collisional processes are Penning ionisation and Hornbeck-Molnar ionisation. In the heteronuclear system Rb(nl) + K(4P), the following exit channels may be operative Rb+ + e + K Rb(nl) + K(4P) --+K++ e + Rb {KRb+ + e. The measurements show that the first channel has an average cross section lo-13 cm2. Those of the other channels are at least three orders of magnitude smaller and thus comparatively negligible. The data obtained from SD to lOS allow to conclude that the flux in the entrance channel ionises at large separa­ tion between Rb(nl) and K(4P). The process of ionisation is dominated by polarisation forces, exchange forces beeing negligible. In the present mixture, Hornbeck-Molnar ionisation leads to homonuclear molecular ions K2+, Rb2+ as well as the heteronuclear one KRb+. We have measured the rate coefficients for the systems K(nl) + Rb Rb(nl) + K --'-+ KRb+ + e--+ KRb+ + e. The rate coefficients increase with the excitation energy of the level nl ; they do not exibit fondamental differences with those measured in pure alkali vapours
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Bernier, Anne. "Le mercure comme atome à deux électrons : détermination et mise en oeuvre d'un pseudopotentiel relativiste : surfaces de potentiel du systeme HgH₂, interprétation de la réactivité du mercure avec le dihydrogène." Paris 11, 1987. http://www.theses.fr/1987PA112181.

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Développement d'un pseudo potentiel relativiste pour traiter l'atome hg comme un système à 2 électrons par les méthodes standards de la chimie quantique. Obtention d'une bonne description des états inferieurs de hgh. Calcul de la surface de potentiel de hgh::(2). Application de ces résultats a l'interprétation de résultats expérimentaux récents de demi-collision hg(3)p::(1)) + h::(2)
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8

Zarour, Bilel. "Étude théorique de l'échange de charge et de l'excitation dans une collision à basse énergie entre un ion (atome) et un agrégat métallique simple." Metz, 2001. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2001/Zarour.Bilel.SMZ0103.pdf.

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Les processus d'échange de charge et d'excitation sont bien connus dans les collisions atomiques. Le but de cette thèse est d'étudier ces processus dans les collisions avec les agrégats, qui sont jusque là mal connus. Les vitesses de collisions sont assez faibles pour pouvoir appliquer la méthode moléculaire. La résolution de l'équation de Schrödmger pour un grand nombre d'électron est impossible. Pour surmonter cette difficulté, nous avons utilise le modèle à électrons indépendants. Dans l'expérience, on ne peut connaître que la configuration finale de quelques électrons. Le formalisme adéquate pour décrire cette situation est le formalisme des probabilités inclusive que nous avons utilisé pour calculer les sections efficaces d'échange de charge et d'excitation. Dans le cas des collisions atome - agrégats de sodium, nous avons comparé avec les expériences du laboratoire d' Aimé Cotton à Orsay et nous avons trouvé un bon accord. Ceci a confirmé la validité de notre modèle théorique
The excitation and charge transfer process are well know in atomic collisions. The aim of this thesis is the study of these process in collisions with metallic clusters. We have worked at low velocities. So to describe the collision, we have used the mollecular method. The resolution of the Schrödmger equation for a great number of electrons is possible, to solve this problem, we have applied the independent electron model (IEM). In this experience, we can detect only some of the electrons to describe this situation, we use the inclusive probabilities formalism, and so we calculate the charge transfer and excitation cross sections. In the collisions atom – clusters of sodium, we have compared with the experimental results of the Aimé Cotton laboratory in Orsay and we have found a good agreement. This has confirmed the validity of our theoretical method
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Dalibard, Jean. "Le rôle des fluctuations dans la dynamique d'un atome couple au champ électromagnétique." Paris 6, 1986. http://www.theses.fr/1986PA066393.

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Etude de la dynamique atomique interne; possibilité de séparer la contribution des fluctuations du vide et de la réaction du rayonnement pour differents processus radiatifs (émission spontanée, déplacement de Lamb, etc. ). Etude de la dynamique atomique externe en partant de l'analogie entre ce problème et celui du mouvement brownien; établissement d'une équation de Fokker-Planck-Kramers pour l'évolution de la fonction de Wigner atomique, avec termes de force stationnaire, force de frottement etc. Etude détaillée du mouvement atomique dans une onde laser stationnaire intense: refroidissement, piégeage.
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Sjakste, Jelena. "Etude par propagation de paquets d'ondes de la dynamique du transfert électronique entre un atome et une surface métallique." Paris 11, 2004. https://tel.archives-ouvertes.fr/tel-00008743.

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Ce travail de thèse est une étude théorique et numérique du processus de transfert de charge résonant (TCR), entre un atome (ion) et un métal pendant une collision. Le TCR correspond au passage d’un électron de l’atome vers le métal, sans changement d’énergie. On étudie le TCR dans des systèmes à plusieurs états localisés. Il peut s'agir des états localisés sur le projectile, ou sur le projectile et une impureté de la surface. Une attention particulière est portée aux transitions induites entre différents états du système par le mouvement du projectile. La Méthode de Propagation de Paquets d’Ondes, qui consiste en une solution directe sur une grille de l’équation de Schrödinger dépendant du temps, est utilisée dans ce travail. On étudie d'abord les perturbations locales du TCR entre un projectile (un ion H-) et une surface métallique (Al ou Cu(111)), induits par la présence d’un adsorbat alcalin (Li ou Cs). Un intérêt particulier était porté au caractère 3-corps du TCR (l’électron interagit avec le projectile, l’adsorbat et le substrat). Les résultats pour Cu(111), qui possède une bande interdite projetée dans la direction normale à la surface, sont très différents des résultats pour Al, qui est un métal à électrons libres. Ensuite, on étudie le TCR entre des atomes de Rydberg (Xe) et une surface métallique, dans un champ électrique extérieur. Les transitions entre les différents états du projectile induits par la collision avec la surface influencent lfortement le TCR. Nos résultats permettent de comprendre des résultats expérimentaux récents (groupe de F. B. Dunning, Houston, USA). Dans ce travail on a montré l'importance d'une﷡étude explicite de la dynamique de TCR
This PhD thesis is a theoretical and numerical study of the resonant charge transfer (RCT) process during a collision between an atom (ion) and a metal surface. The RCT corresponds to the transfer of an electron from the atom to the metal without an energy change. We study the RCT in systems with several localised states. These states can be localised on the projectile, or they can be localised on the projectile and an impurity of the surface. Special attention is paid to the projectile motion induced transitions between different states of the system. The Wave Packet Propagation Method, which consists in on the grid solution of the time-dependent Schrödinger equation, is used in this work. First, we study the local perturbation of the RCT between a projectile (H- ion) and a metal surface (Al or Cu(111)), induced by the presence on an alkali adsorbate (Li or Cs). Special attention is paid to the 3-body character of the RCT (the electron interacts with the projectile, the adsorbate and the substrate). The results for Cu(111), which has a projected band gap in the direction normal to the surface, are very different from the results for Al, which is a free-electron metal. Second, we study the RCT between Rydberg atoms (Xe) and a metal surface, in an external electric field. The collision-induced transitions between different states of the projectile strongly affect the RCT. Our results allow to understand the recent experimental results (group of F. B. Dunning, Houston, USA). This work shows the importance of an explicit study of the dynamics of RCT
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Books on the topic "Collision atome atome"

1

McCarthy, I. E. Electron-atom collisions. Cambridge: Cambridge University Press, 1995.

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Bransden, B. H. Charge exchange and the theory of ion-atom collisions. Oxford: Clarendon Press, 1992.

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Gianturco, Franco A. Collision Theory for Atoms and Molecules. Boston, MA: Springer US, 1989.

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1938-, Gianturco Francesco A., ed. Collision theory for atoms and molecules. New York: Plenum Press, 1989.

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Gianturco, Franco A., ed. Collision Theory for Atoms and Molecules. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5655-4.

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Berényi, Dénes. High-energy ion-atom collisions. Berlin: Springer-Verlag, 1988.

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Berényi, D., and G. Hock, eds. High-Energy Ion-Atom Collisions. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-53738-4.

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Burke, Philip G., and Charles J. Joachain. Theory of Electron—Atom Collisions. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1567-2.

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Berényi, D., and G. Hock, eds. High-Energy Ion-Atom Collisions. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/3-540-18732-4.

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Burke, P. G. Theory of electron-atom collisions. New York: Plenum Press, 1995.

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Book chapters on the topic "Collision atome atome"

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Nathanson, Gilbert M. "When Liquid Rays Become Gas Rays: Can Evaporation Ever Be Non-Maxwellian?" In Molecular Beams in Physics and Chemistry, 631–47. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63963-1_27.

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AbstractA rare mistake by Otto Stern led to a confusion between density and flux in his first measurement of a Maxwellian speed distribution. This error reveals the key role of speed itself in Stern’s development of “the method of molecular rays”. What if the gas-phase speed distributions are not Maxwellian to begin with? The molecular beam technique so beautifully advanced by Stern can also be used to explore the speed distribution of gases evaporating from liquid microjets, a tool developed by Manfred Faubel. We employ liquid water and alkane microjets containing dissolved helium atoms to monitor the speed of evaporating He atoms into vacuum. While most dissolved gases evaporate in Maxwellian speed distributions, the He evaporation flux is super-Maxwellian, with energies up to 70% higher than the flux-weighted average energy of 2 RTliq. The explanation of this high-energy evaporation involves two beautiful concepts in physical chemistry: detailed balancing between He atom evaporation and condensation (starting with gas-surface collisions) and the potential of mean force on the He atom (starting with He atoms just below the surface). We hope that these measurements continue to fulfill Stern’s dream of the “directness and simplicity of the molecular ray method.”
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Popov, N. P. "Muonic atom — atom collision processes." In Lecture Notes in Physics, 347–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-53738-4_75.

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Bransden, B. H. "Non-Adiabatic Atom-Atom Collision." In Collision Theory for Atoms and Molecules, 289–342. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5655-4_9.

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Ford, A., and John Reading. "Ion-Atom and Atom-Atom Collisions." In Springer Handbook of Atomic, Molecular, and Optical Physics, 753–60. New York, NY: Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-26308-3_50.

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Meystre, Pierre. "Collisions." In Atom Optics, 95–115. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4757-3526-0_6.

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Macek, J. H. "Ion-Atom Collisions." In New Directions in Atomic Physics, 59–70. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4721-1_5.

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Shevelko, Viatcheslav P. "Electron-Atom Collisions." In Atoms and Their Spectroscopic Properties, 120–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03434-7_5.

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Shevelko, Viatcheslav P. "Ion-Atom Collisions." In Atoms and Their Spectroscopic Properties, 161–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03434-7_6.

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Pal’chikov, Vitalij G., and Vjatcheslav P. Shevelko. "Ion-Atom Collisions." In Reference Data on Multicharged Ions, 166–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-57789-5_6.

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Macek, Joseph. "Ion-Atom Collisions." In NATO ASI Series, 129–42. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-5544-1_8.

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Conference papers on the topic "Collision atome atome"

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Moshammer, R. "Kinematically complete ion-atom collision experiments: Ionization of atoms in strong fields." In The 21st international conference on the physics of electronic and atomic collisions (21 IPEAC). AIP, 2000. http://dx.doi.org/10.1063/1.1302687.

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Perrin, A., C. M. Savage, V. Krachmalnicoff, D. Boiron, A. Aspect, C. I. Westbrook, and K. V. Kheruntsyan. "Atomic four-wave mixing via condensates collisions." In Quantum-Atom Optics Downunder. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/qao.2007.qwb3.

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Gibble, Kurt. "Scattering of cold atom coherences by hot atoms: Background gas collision shifts of primary fountain clocks." In 2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC). IEEE, 2013. http://dx.doi.org/10.1109/eftf-ifc.2013.6702259.

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Joachain, C. J. "Electron-atom collision theory." In The Sixteenth International Conference on the Physics of Electronic and Atomic Collisions. AIP, 1990. http://dx.doi.org/10.1063/1.39245.

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"Indication of the Wigner threshold law in collisions between antiprotonic helium and hydrogenic molecules." In Exotic atoms and related topics 2005. Wien: Verlag der Österreichischen Akademie der Wissenschaften, 2009. http://dx.doi.org/10.1553/exa05s407.

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Welge, K. H. "Chaos in atoms ?" In The Sixteenth International Conference on the Physics of Electronic and Atomic Collisions. AIP, 1990. http://dx.doi.org/10.1063/1.39194.

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Gallagher, T. F., D. S. Thomson, and M. J. Renn. "Radiative collisions of Rydberg atoms." In The eighteenth international conference on the physics of electronic and atomic collisions. AIP, 1993. http://dx.doi.org/10.1063/1.45236.

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Abu-Shams, Mohammad, and Ishraq Shabib. "Irradiation Induced Damage of Fe-10%Cr Under Uniaxial Pressure." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51686.

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Structural materials of next generation nuclear reactors are expected to experience severe operating conditions including intense heat, high irradiation doses, thermal and mechanical stresses, and corrosive environments, which would potentially degrade material properties and impose severe threat to structural integrity. For example, high irradiation doses cause the evolution of displacement cascades, consisting of point defects, which lead to void swelling, irradiation creep, irradiation assisted stress corrosion cracking, and embrittlement. Over the last several decades, extensive computational researches have been conducted to study displacement cascades and generate defect statistics over a wide range of irradiation doses and temperatures for pure materials, primarily Fe. However, very limited data can be found to determine cascade evolution and defect statistics of Fe-alloys under pressure. In this work, large-scale molecular dynamics simulations have been performed to study displacement cascade and generate defect statistics of Fe-10%Cr alloy under uniaxial pressure. The selection of the material is based on the fact that Fe and Cr are the two major alloying elements of Ferritic-martensitic steels, which have shown promise to be a candidate material for future generation reactors due to high temperature stability and reduced swelling under irradiation. The simulated material is built from a single crystal Fe model of [130], [310], and [001] orientation, and randomly substituting Fe atoms by Cr. Empirical EAM potential has been used to define interatomic interactions. Irradiation simulations are performed for doses between 2–15keV, and pressure ranges between −10,000 bars to +10,000 bars applied along the x-direction. Simulation temperature is kept at a minimum, e.g. 15K, to minimize thermal influences. Displacement cascades are generated by imparting kinetic energy to a lattice atom (i.e. primary-knock-on-atom, PKA) along an arbitrary crystallographic direction (i.e. the diagonal direction of the simulation cell). Point defects are identified using the Wigner-Seitz method. Upon collision, the PKA atom displaces the surrounding atoms from their perfect lattice cites and causes a rapid increase in defect numbers. As the imposed energy is dissipated through the crystal, the displaced atoms recombine with the vacancies and the defect numbers gradually decrease and become stable. The cascade structure shows the presence of the vacancies at the core of the cascades surrounded by the interstitials. The number of defects increases almost linearly with increasing the irradiation dose for any pressure. The effect of pressure is found to be more profound within the intermediate pressure range, e.g. between −100 to +1000 bar, within which the number of point defects continually decreases as the pressure changes from tension to compression. The trend is found to be consistent for the whole PKA energy range. Point defects are also found to form defect clusters. The common neighbor analyses haves been performed to determine the structure of the clustered defects. It has been revealed that the defect clusters are of cubic diamond type. Additional analyses are currently under progress to evaluate the influence of pressure on cascade volume, point defect composition, and cluster composition.
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A., José Récamier. "Algebraic methods for an atom-anharmonic oscillator collision." In Half collision resonance phenomena in molecules. AIP, 1991. http://dx.doi.org/10.1063/1.40545.

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Blackwood, Jennifer E. "Positronium—atom scattering." In The 21st international conference on the physics of electronic and atomic collisions (21 IPEAC). AIP, 2000. http://dx.doi.org/10.1063/1.1302678.

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Reports on the topic "Collision atome atome"

1

Flannery, M. R. Collision Dynamics With Stretched Atoms. Fort Belvoir, VA: Defense Technical Information Center, January 1999. http://dx.doi.org/10.21236/ada361186.

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Neynaber, Roy H. Low-Energy Collisions of Excited Atoms. Fort Belvoir, VA: Defense Technical Information Center, May 1985. http://dx.doi.org/10.21236/ada179154.

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Neynaber, Roy H., and Sheng Y. Tang. Low-Energy Collisions of Excited Atoms. Fort Belvoir, VA: Defense Technical Information Center, May 1986. http://dx.doi.org/10.21236/ada170859.

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Tanis, J. A. Correlated charge-changing ion-atom collisions. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/5296180.

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Gallagher, A. Spectroscopic diagnostics of electron-atom collisions. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5957609.

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McColm, D. Correlated electron processes in ion-atom collisions. Office of Scientific and Technical Information (OSTI), February 1990. http://dx.doi.org/10.2172/7188360.

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Lin, Chun C. Interactions and Collisions of Electrons With Atoms and Molecules. Fort Belvoir, VA: Defense Technical Information Center, October 2001. http://dx.doi.org/10.21236/ada401207.

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Kvale, T. J. Measurements of scattering processes in negative ion-atom collisions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5657562.

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Flannery, M. R. Recombination, Electron-Excited Atom Collisions and Ion-Molecule Reactions. Fort Belvoir, VA: Defense Technical Information Center, December 1995. http://dx.doi.org/10.21236/ada303623.

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Flannery, M. R. Termolecular Association and Laser-Assisted Electron-(Excited) Atom Collisions. Fort Belvoir, VA: Defense Technical Information Center, August 1991. http://dx.doi.org/10.21236/ada241647.

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