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.
Full textQuichaud, 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.
Full textFéron, 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.
Full textKaram, 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.
Full textAstruc, 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.
Full textDjerad, 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.
Full textThis 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
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.
Full textZarour, 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.
Full textThe 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
Dalibard, Jean. "Le rôle des fluctuations dans la dynamique d'un atome couple au champ électromagnétique." Paris 6, 1986. http://www.theses.fr/1986PA066393.
Full textSjakste, 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.
Full textThis 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
Karam, Jean-Christophe. "Collision d'un atome métastable de gaz rare sur une surface nono ou micro-structurée et optique atomique." Paris 13, 2005. http://www.theses.fr/2005PA132029.
Full textRobert, Jean-Claude. "Production de radicaux CN par la réaction C + N₂O : analyse des distributions rovibroniques et spectroscopie de saturation." Paris 11, 1985. http://www.theses.fr/1985PA112372.
Full textRadouani, Abdelhak. "Réaction des atomes métastables de gaz rares (Ar*(3p2,0), Kr*(3p2) et Xe*(3p2)) avec le silane." Grenoble 1, 1986. http://www.theses.fr/1986GRE10143.
Full textSJAKSTE, Jelena. "Etude par propagation de paquets d'ondes de la dynamique du transfert électronique." Phd thesis, Université Paris Sud - Paris XI, 2004. http://tel.archives-ouvertes.fr/tel-00008743.
Full textTaoutioui, Abdelmalek. "Étude théorique de la dynamique électronique au cours de collisions entre des ions et des cibles atomiques hautement excitées." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS323.
Full textThe understanding of the electronic processes taking place during atomic collisions is of great interest for the modeling of phenomena observed in complex systems such as atmospheric, astrophysical and biological environments. These processes manifest at the microscopic level but play a determining role on the evolution and the physicochemical properties of these macroscopic systems. From a fundamental point of view, collisions are also privileged "laboratories" for the study of quantum systems with N-bodies. Ion-atom collisions are of crucial importance in several fields such as that concerning nuclear fusion by magnetic confinement: the understanding of the electronic processes is necessary for the modeling of this type of plasmas. This thesis is situated in this context and is dedicated to the theoretical study of the electronic processes that occur during collisions between ions and highly excited atomic targets. In this work, we privileged the modeling of the electronic capture and the computation of the cross sections for the proton-hydrogen system. We adopted two non-perturbative theoretical approaches: the classical CTMC method and a semi-classical SCAOCC method. We calculated the total and partial capture cross sections for targets initially excited up to the n = 7 layer. Comparisons between the results of these methods and the few theoretical data available are made and represent the originality of the work. Empirical scale laws for total cross sections are also described
Mercier-Depuydt, Eliane. "Contribution a l'etude des collisions ion-atome a basse energie : un modele semi-diabatique pour les courbes de potentiel des ions moleculaires arh**(+*) et hene**(+*)." Paris 6, 1987. http://www.theses.fr/1987PA066522.
Full textGobet, Franck. "Fragmentation de molécules et d'agrégats moléculaires induite par collision avec un atome à haute vitesse (vitesse relative de l'ordre de c/100)." Phd thesis, Université Claude Bernard - Lyon I, 2001. http://tel.archives-ouvertes.fr/tel-00001427.
Full textJardin, Pascal. "Étude des mécanismes élémentaires de transfert d'énergie au cours d'une collision entre un ion lourd rapide multi-chargé et un atome neutre /." Gif-sur-Yvette : Service de documentation et d'édition multimédia, Centre d'études de Saclay, 1995. http://catalogue.bnf.fr/ark:/12148/cb358383673.
Full textGadea, Florent Xavier. "Theorie des hamiltoniens effectifs : applications aux problemes de diabatisation et de collision reactive." Toulouse 3, 1987. http://www.theses.fr/1987TOU30276.
Full textIsmail, Iyas. "Développement d'un détecteur sans temps mort sensible en temps et en position : Application à l'étude des collisions de petits agrégats d'argon Ar+n sur une cible d'argon." Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00011289.
Full textNous avons étudié la fragmentation induite par collision des petits agrégats d'argon (Ar2+ et Ar3+) avec une cible d'argon atomique dans la gamme des énergies du keV. Toutes les voies de fragmentation : la dissociation induite par collision (CID) et l'échange de charge dissociatif (DCT) sont analysées par la corrélation vectorielle de tous les fragments détectés en coïncidence. En particulier, nous avons montré que le processus DCT dépendait fortement de l'énergie interne initiale de l'agrégat (i.e. du défaut de résonance). La comparaison de diverses observables mesurées en collision Ar2+-Ar et Ar3+-Ar nous a conduit à conclure que les agrégats Ar3+ produits dans notre source ont majoritairement la structure d'un dimère chargé (Ar2+) autour duquel orbite un troisième atome peu lié.
Rossi, François-Noël. "Etude théorique des collisions non réactives entre atomes alcalins et molécules d'hydrogène ou de deuterium : Calcul et analyse des surfaces de potentiel, application aux transitions de structure fine du rubidium." Paris 13, 1986. http://www.theses.fr/1986PA132015.
Full textPICARD, Yan. "Dynamique de fragmentation induite par collision de petits agrégats métalliques." Phd thesis, Université Paris Sud - Paris XI, 1999. http://tel.archives-ouvertes.fr/tel-00008482.
Full textJARDIN, PASCAL. "Etude des mecanismes elementaires de transfert d'energie au cours de la collision entre un ion lourd rapide multi-charge et un atome neutre." Caen, 1995. http://www.theses.fr/1995CAEN2014.
Full textGirard, Bertrand. "Etude de la collision reactive ii + f -> if + i par fluorescence induite par laser." Paris 6, 1987. http://www.theses.fr/1987PA066398.
Full textBERGNES, BRASEY CHANTAL. "Etude des processus directs elastique et inelastiques se produisant lors de la collision entre un ion d'helium et une cible d'hydrogene, pour une energie variant de 1,5 a 30 kev." Toulouse 3, 1988. http://www.theses.fr/1988TOU30204.
Full textElayoubi, Mustapha. "Transfert d'atomes d'hydrogène vers la cathode d'un arc réducteur de composition argon-hydrogène /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1989. http://theses.uqac.ca.
Full textBensitel, Abdeslam. "Spectroscopie des ions de recul d'argon produits par impact d'ions lourds dans le domaine 90-850a." Caen, 1988. http://www.theses.fr/1988CAEN2003.
Full textBoutalib, Abderrahim. "Etude théorique de la surface de potentiel du système HO::(2) + H. : Influence de la corrélation électronique." Pau, 1986. http://www.theses.fr/1986PAUU3009.
Full textLouc, Sandrine. "Mesure des sections efficaces des différents processus intervenant dans la fragmentation d'agrégats d'hydrogène H+n (3 ≤ n ≤ 35) induite par collision à haute vitesse (60 keV-u) sur un atome d'hélium." Lyon 1, 1997. http://www.theses.fr/1997LYO10144.
Full textHami, Mohamed. "Spectroscopie du mélange helium-xénon : rôle du monoxyde de carbone : analyse cinétique dans l'ultra-violet lointain." Toulouse 3, 1988. http://www.theses.fr/1988TOU30169.
Full textLemoine, Didier. "Étude quantique des transferts inélastiques dans les collisions atome-atome et atome-molécule." Lille 1, 1988. http://www.theses.fr/1988LIL10014.
Full textBuridon, Victor. "Application de la spectrométrie de masse COINTOF à l'étude de la dissociation de petits agrégats d'eau protonés par collision sur un atome d'argon : développement d'une cible de nano-gouttes de gaz rare." Phd thesis, Université Claude Bernard - Lyon I, 2013. http://tel.archives-ouvertes.fr/tel-00994146.
Full textId, barkach Tijani. "Fragmentation des hydrocarbures CHy(+) (y=2-4) par collision. AGAT@ANDROMEDE." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS263/document.
Full textIn the interstellar medium, among the 200 molecules observed, the hydrocarbons are in abundance. The formation of hydrocarbons CHy(+) is done between a C+ and a hydrocarbon atom or molecule. Thereafter, these hydrocarbons are reacting between them to form bigger hydrocarbons. Therefore, they are the precursor of all the hydrocarbons present in the interstellar medium, so it is necessary to study them in details. These hydrocarbons CHy(+) are under a lot of different physical processes in the interstellar medium including the collision with an electron, the absorption of an ultra violet photon or a cosmic ray. They will be excited by these processes and gain excess energy they will liberate by fragmentation which leads to a redistribution of species. Therefore, a precise knowledge of the rate of reaction and of the branching ratios of the fragmentation is needed to do specific simulations in the chemistry of the interstellar medium. In order to document all these branching ratios, no matter the physical or chemical process at stake, we experimentally built semi-empirical breakdown curves which are the branching ratios of the paths of fragmentation as a function of the internal energy of the molecule.The experiment was done using the AGAT silicon multi-detector and the ANDROMEDE accelerator. CHy(+) molecules produced at high velocity (3 u.a.) are collided with He atom at rest in the lab. Thanks to the experimental developments, all fragments, neutral or charged, are separately identified, allowing to resolve all fragmentation channels. Therefore, we have been able to measure fragmentation branching ratios for CHyq+ (y=2-4, q=0-3) and the kinetic energy distributions of the neutral fragments.From the branching ratios, the kinetic energy distributions and the theoretical dissociation energies we built BDCs that revealed to be in accordance with the experimental branching ratios which already exists in the literature concerning the photo dissociation, the dissociative recombination and the electronic collisions. Finally, a model has been developed to predict the chemical reactions of the branching ratios as well as to predict their evolution with the temperature
Lemoine, Didier. "Etude quantique des transferts inélastiques dans les collisions atome-atome et atome-molécule." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37615189n.
Full textBlieck, Jérémy. "Couplage entre un piège magnéto-optique et un spectromètre d'impulsion d'ions de recul : application aux collisions ions-atomes." Caen, 2008. http://www.theses.fr/2008CAEN2052.
Full text87Rb atoms have been cooled, trapped and prepared as targets for collision studies with 2 and 5 keV Na+ projectiles. The physics studied deals with charge exchange processes. The active electron, which is generally the most peripheral electron of the atomic target, is transferred from the target onto the ionic projectile. The ionized target is called recoil ion. The technique used to study this physics is the MOTRIMS technique, which combines a magneto optical trap and a recoil ion momentum spectrometer. The spectrometer is used for the measurement of the recoil ions momentum, which gives access to all the information of the collision: the Q-value (which is the potential energy difference of the active electron on each particle) and the scattering angle of the projectile. The trap provides extremely cold targets to optimize the measurement of the momentum, and to release the latter from thermal motion. Through cinematically complete experiments, the MOTRIMS technique gives access to better resolutions on momentum measurements. Measurements of differential cross sections in initial and final capture states and in scattering angle have been done. Results obtained for differential cross sections in initial and final states show globally a good agreement with theory and an other experiment. Nevertheless, discrepancies with theory and this other experiment are shown for the measurements of doubly differential cross sections. These discrepancies are not understood yet. The particularity of the experimental setup designed and tested in this work, namely a low background noise, allows a great sensitivity to weak capture channels, and brings a technical and scientific gain compared with previous works
BARDET, JEAN-PAUL. "Contribution a l'etude de l'effet d'anode dans les electrolytes fondus tel le melange equimoleculaire licl-kcl fondu." Paris 6, 1986. http://www.theses.fr/1986PA066585.
Full textJaïdane, Nejmeddine. "Etude du transfert de charge entre des atomes de soufre et des protons." Paris 7, 1987. http://www.theses.fr/1987PA077121.
Full textPons, Bernard. "Collisions ion-atome aux énergies intermédiaires." Bordeaux 1, 1994. http://www.theses.fr/1994BOR10612.
Full textRabli, Djamal. "Extension de la méthode du potentiel modèle pour traiter la dynamique des systèmes moléculaires à couches ouvertes : applications : au transfert de charge dans les collisions entre Si3+ et He et entre He2+ et He métastable, à la détermination des potentiels adiabatiques Li2." Paris 6, 2001. http://www.theses.fr/2001PA066564.
Full textKumar, Vishant. "Fragmentation dynamics and geometrical arrangement of diatomic molecular clusters." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC245.
Full textThe analysis of a kinematically complete ion-cluster collision experiment provides insight in the dynamics of the ionized cluster dissociation. The gas phase targets allow to study the cluster in a simple environment and to determine their intrinsic properties for further condensed states. Small van der Waals clusters of N2 and CO are produced in the supersonic expansion of a gas jet and irradiated by a low energy highly charged ion beam produced by the ARIBE/GANIL facility. Using our experimental set-up COLTRIMS (COLd Target Recoil Ion Momentum Spectroscopy) it is made possible to measure in coincidence the 3-D momentum vectors of the charged fragments resulting from the collision. We have performed experiment to investigate the fragmentation dynamics and geometry of N2 and CO dimers and trimers using a projectile beam Ar9+ with the 15 qkeV energy. Following multiple electron capture, the target undergoes two or three body dissociation. For three body channels, two distinct processes have been identified in which the van der Waals and covalent bond breaks either simultaneously or sequentially. Additionally, the Coulomb explosion imaging technique has been used to determine the three dimensional structure of the N2 and CO molecular dimers and trimers. We found that the N2 and CO molecules sit perpendicularly to the dimer axis in a planar (H) or non-planar (X) configuration and that (N2)3 and (CO)3 trimers exhibit an equilateral triangular geometry
Thomsen, Laura Kathrine Wehde, and n/a. "Using Quantum Feedback to Control Nonclassical Correlations in Light and Atoms." Griffith University. School of Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040406.124012.
Full textLeredde, Arnaud. "Collisions ion-atome sur cible préparée par laser : étude à haute résolution du processus de simple capture." Caen, 2012. http://www.theses.fr/2012CAEN2040.
Full textSingle charge transfer in low-energy Na++87Rb(5s,5p) collisions is investigated using magneto-optically trapped Rb atoms and high-resolution recoil-ion momentum spectroscopy. The three-dimensional reconstruction of the recoil-ion momentum provides accurate relative cross-sections for the active channels and the projectile scattering angle distributions. Thanks to the high experimental resolution, scattering structures such as diffractionlike oscillations in angular distributions are clearly observed. The measurements are compared with molecular close-coupling calculations and an excellent agreement is found. To go further in the test of the theory, the target is prepared in an oriented state. It is the first time that such collision experiments with oriented target is performed with such a high resolution. The right-left asymmetry expected for the scattering angle distribution is evidenced. The agreement between MOCC calculations and experiments is very good. Simple models developped for collisions with oriented target are also discussed
Terrier, Hugo. "Étude théorique des collisions ultra-froides en réseau optique." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S028/document.
Full textAn optical lattice, created by lasers, can trap atoms cooled to ultra-low temperatures. It provides a constraint as if it were a perfect crystal (a crystal without thermal agitation). I describe the states of particles in a periodic potential (optical network) using probability waves (quantum physics) stationary (independent theory of time). The wave nature of the material is exacerbated at very low temperatures and gives rise to interference phenomena and individual resonance
LaForge, Aaron Christopher. "Three-body dynamics in single ionization of atomic hydrogen by 75 keV proton impact." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/Laforge_09007dcc80798b26.pdf.
Full textVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 21, 2010) Includes bibliographical references (p. 82-87).
Blieck, J. "Couplage entre un piège magnéto-optique et un spectromètre d'impulsion d'ions de recul ; applications aux collisions ions-atomes." Phd thesis, Université de Caen, 2008. http://tel.archives-ouvertes.fr/tel-00339513.
Full textNave, Sven Lemoine Didier. "Dynamique quantique des collisions atome-adsorbat ; molécule-surface." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2005. https://iris.univ-lille1.fr/dspace/handle/1908/782.
Full textRésumé en français et en anglais. Publications en anglais intégrées au texte. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 267-276.
Nave, Sven. "Dynamique quantique des collisions atome-adsorbat ; molécule-surface." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-101-102.pdf.
Full textLa seconde partie de la thèse concerne l'étude des dissociations activées de H2 et D2 avec Cu(lll), où le terme "activée" signifie qu'une barrière de potentiel doit être franchie afin de dissocier la molécule. Une approche de paquet d'ondes quantiques traitant explicitement les six degrés de liberté de la molécule, est utilisée. La validité de deux surfaces d'énergie potentielle a été testée, Ces surfaces sont basées sur une forme LEPS (London-Eyring-Polanyi-Sato) interpolant des résultats de calculs de fonctionnelle de la densité. Les calculs de l'adsorption dissociative et de l'excitation ou la désexcitation ro-vibrationnelle des molécules diffusées, sont analysés et comparés avec les expériences, en fonction du modèle d'interaction, de l'état vibrationnel initial de la molécule et de son espèce isotopique. Les surfaces de potentiel testées mènent à des résultats bien différents, par exemple en ce qui concerne les seuils de dissociation en fonction de l'énergie d'incidence, ou pour l'efficacité de la conversion d'énergie vibrationnelle en énergie translationnelle afin de surmonter la barrière à la dissociation, Aucune n'est satisfaisante pour reproduire l'ensemble des distributions expérimentales. Cependant, les deux surfaces de potentiel sont en bon accord pour donner des courbes de dissociation pour D2 et H2, initialement dans leur état fondamental, séparées d'environ 0. 07 eV en fonction de l'énergie d'incidence. Ce résultat semble très raisonnable physiquement, puisque le décalage de 0. 07 eV correspond aussi à la différence des énergies de point zéro de D2 et H2. Ce point confirme une grande incertitude dans l'extraction de certains des paramètres utilisés pour interpoler les mesures expérimentales, du fait que le décalage expérimental est de 0. 11 ou 0. 15 eV selon les jeux de paramètres
Davies, Hilary Jane. "An optically guided atomic fountain." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4580/.
Full textHaffad, Abdelkrim. "Angular momentum transfer in electron-atom and atom-atom collisional ionization." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/29826.
Full textSpratt, David James. "Electron loss and excitation in atom-atom collisions." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287429.
Full text