Teses / dissertações: "Collisions ion-ion"

1

Hughes, Ian G. "Electron ion and ion-ion collisions". Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335410.

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2

McGuinness, Philip. "Electron-ion elastic collisions". Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268236.

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3

Ebanezar, John Angelin [Verfasser]. "Negative Ion formation in Ion-Molecule and Ion-Surface collisions / Angelin Ebanezar John". Greifswald : Universitätsbibliothek Greifswald, 2014. http://d-nb.info/1061064654/34.

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4

O'Rouke, Sheelagh Francesca Camille. "Theory of ion-atom collisions". Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334486.

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5

McSherry, D. M. "Ionization in ion-atom collisions". Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368567.

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6

Bradley, J. P. "Charge transfer during ion-atom collisions". Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426960.

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7

Pons, Bernard. "Collisions ion-atome aux énergies intermédiaires". Bordeaux 1, 1994. http://www.theses.fr/1994BOR10612.

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L'approche moleculaire de la theorie des collisions ion-atome est etendue au domaine des energies intermediaires. L'emploi d'un facteur de translation commun optimise permet une evaluation quantitative precise des processus de capture et d'excitation ainsi qu'une evaluation implicite du processus d'ionisation a haute energie d'impact. Une modelisation du canal d'ionisation est alors proposee afin d'obtenir un traitement theorique unique permettant de calculer les sections efficaces des trois processus inelastiques. Le mecanisme d'ionisation dans un cadre moleculaire est explicite et corrobore le mecanisme d'ionisation au point de selle dont la mise en evidence est fort controversee experimentalement

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8

Pandit, Yadav. "AZIMUTHAL ANISOTROPY IN HEAVY ION COLLISIONS". Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1353871180.

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9

Taliotis, Anastasios Socrates. "Geometrical Methods in Heavy Ion Collisions". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1285088429.

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10

Watts, Mark Frederick. "Charge transfer and ionisation in collisions between positive ions". Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235867.

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11

Samanta, Ranjit Kumar. "Semi-classical method for heavy ion collisions". Thesis, University of North Bengal, 1985. http://hdl.handle.net/123456789/675.

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12

Torres, Theresa Ann. "Development of Fourier transform ion cyclotron resonance mass spectrometry for the study of ion-ion reactions /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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13

Stockmeier, Marc R. "Pion production in relativistic heavy ion collisions". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965097234.

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14

Lin, Yawei. "Spectroscopy of High Energy Ion-neutral Collisions". Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19720.

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This research work focused on studying the emission spectroscopy produced from the high energy ion-molecule collision processes in mass spectrometry. The collision experiments are described and divided into 4 chapters (Chapter 3, 4, 5, 6).N2O+● is an ion of atmospheric importance. In chapter 3 the investigation of the collision between high translational energy (4-8 keV range) N2O+● ions and Helium target gas in mass spectrometry using collision induced emission (CIE) spectroscopy is described.In chapter 4, the collision-induced emission (CIE) spectra from 4-8 keV collisions between projectile He+● ions and CO2 target gas (He+●/CO2) were obtained. In Chapter 5, to probe the validity of this hypothesis, CIE experiments were carried out to observe the photon emissions from keV collisions of a selection of projectile ions with O2 target gas. By studying the resulting CIE spectra, a second potential mechanism came to light, one that involves the nearly isoenergetic O2+. A → X state transition. In chapter 6, neutral hydroxymethylene and formaldehyde were generated by charge exchange neutralization of their respective ionic counterparts and then were reionized and detected as recovery signals in neutralization-reionization mass spectrometry in the modified VG-ZAB mass spectrometer.

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15

Qi, Xiaodi. "Ion-molecule spiraling collisions and termolecular recombination". Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/30044.

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16

Qin, GuangYou. "Penetrating probes in relativistic heavy ion collisions". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115878.

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In this dissertation, the phenomenology of electromagnetic radiation and high transverse momentum jets in relativistic heavy ion collisions is investigated. These are two very important probes to study the strongly interacting matter at extreme temperatures and/or densities and to investigate the possibility of a phase transition between hadronic matter and quark-gluon plasma (QGP). First, a new channel of direct photon production from a charge-asymmetric QGP is explored in the effective theory of quantum chromodynamics (QCD) at high temperature. The photon production from this new channel is found to be suppressed compared to QCD annihilation process and Compton scattering at low baryon density, but might assume significance in baryon-rich matter. Second, the radiative jet energy loss in a three-dimensional ideal hydrodynamical medium is studied for Au+Au collisions at Relativistic Heavy Ion Collider (RHIC). A systematic analysis of the nuclear modification factor RAA is presented for pi0 production at high pT in central and non-central collisions, at mid and forward rapidity. Third, jet energy loss by elastic collisions is consistently incorporated in the same formalism and applied to the study of jet quenching at RHIC. It is found that the nuclear modification factor RAA for pi0 in relativistic heavy ion collisions is sensitive to both collisional and radiative energy loss, while the average energy loss is less affected by the inclusion of collisional energy loss. Last, the nuclear suppression of photon-tagged jets at high pT is studied by incorporating not only direct photons, but the additional sources from fragmentation and jet-plasma interaction. We find that these additional sources are very important for a complete study of the correlations between hard photons and hadrons and even dominate in some kinetic regime.

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17

McCartney, Mark. "Ionization processes in multielectron ion-atom collisions". Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359106.

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18

Mazeliauskas, Aleksas. "Fluctuations in Ultra-Relativistic Heavy Ion Collisions". Thesis, State University of New York at Stony Brook, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10256734.

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Fluctuations are one of the main probes of the physics of the new state of hot and dense nuclear matter called the Quark Gluon Plasma (QGP) which is created in the ultra-relativistic heavy ion collisions. In this dissertation we extend and improve upon the existing descriptions of heavy ion collisions in three different directions: we study the new signatures of initial state fluctuations, the propagation of perturbations in the early stages of the collision, and the effect of thermal fluctuations on the hydrodynamic expansion of the QGP.

First, in Chapter 3 we study initial state fluctuations by examining the complete statistical information contained in the two-particle correlation measurements in hydrodynamic simulations of Pb+Pb collisions at the CERN Large Hadron Collider (√s_NN = 2.76 TeV). We use Principal Component Analysis (PCA) to decompose the spectrum of harmonic flow, v_n(p_T) for n = 0–5, into dominant components. The leading component is identified with the standard event plane v_n(p_T), while the subleading component describes additional fluctuations in the two-particle correlation function. We find good geometric predictors for the orientation and the magnitude of the leading and the subleading flows. The subleading v₀, v₁, and v₃ flow harmonics are shown to be a response to the radial excitation of the corresponding eccentricity ϵ_n. In contrast, for v₂ the subleading flow in peripheral collisions is dominated by the nonlinear mixing between the leading elliptic flow and radial flow fluctuations. Nonlinear mixing also plays a significant role in generating subleading v₄ and v₅ harmonics. The PCA gives a systematic way of studying the full information of the two-particle correlation matrix and identifying the subleading flows, which we show are responsible for factorization breaking in hydrodynamics.

Second, in Chapter 4 we study the thermalization and hydrodynamization of fluctuations at the early stages of heavy ion collisions. We use leading order effective kinetic theory, accurate at weak coupling, to simulate the pre-equilibrium evolution of transverse energy and flow perturbations. For the short evolution we can use a linear response theory to construct the pre-equilibrium Green functions. Then the energy-momentum tensor at a time when hydrodynamics becomes applicable can be expressed as a linear convolution of response functions with the initial perturbations. We propose combining effective kinetic theory with weak coupling initial state models, such as IP-Glasma, to model the complete pre-thermal evolution from saturated nuclei to hydrodynamics in a weak coupling framework.

Last, in Chapter 5 we consider out-of-equilibrium hydrodynamic fluctuations in the expanding QGP. We develop a set of kinetic equations for a correlator of thermal fluctuations which are equivalent to nonlinear hydrodynamics with noise. We first show that the kinetic response precisely reproduces the one-loop renormalization of the shear viscosity for a static fluid. We then use the hydro-kinetic equations to analyze thermal fluctuations for a Bjorken expansion. The steady state solution to the kinetic equations determine the coefficient of the first fractional power of the gradient expansion (∞ 1/(τ T)^3/2), which was computed here for the first time. The formalism of hydro-kinetic equations can be applied to more general background flows and coupled to existing viscous hydrodynamic codes to incorporate the physics of hydrodynamic fluctuations.

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19

Zamkov, Mikhail. "Multi-electron processes in Ion-atom collisions /". Search for this dissertation online, 2003. http://wwwlib.umi.com/cr/ksu/main.

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20

Valerio, Peter Michael 1968. "Heavy quark production in heavy-ion collisions". Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/288922.

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The results of the full next-to-leading-order calculation of open charm production cross section, via hard parton scattering, for both hadronic and heavy-ion collisions at RHIC and LHC energies are presented. In addition to the total cross section, the transverse momentum and rapidity distributions are included. An effective K-factor which encapsulates the next-to-leading-order corrections and the nuclear effects is presented. The open charm yield will be measured through the correlated dileptons produced when the charm decays. An important background comes from the decay of bottom quarks. Therefore, the open bottom yield from hard parton scatterings is presented. The first next-to-leading-order calculation of the thermal heavy quark production is presented, as well as the dimuon spectrum from both the thermal and the initial fusion charm and bottom production at RHIC energies.

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21

Wang, Yicheng. "Slow collisions of hydride ion and deuteride ion with sodium, potassium and cesium". W&M ScholarWorks, 1987. https://scholarworks.wm.edu/etd/1539623770.

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The cross sections of charge transfer and electron detachment in collisions of H$\sp{-}$ and D$\sp{-}$ with Na, K and Cs have been measured for collision energies ranging from 3 to 300 eV. Both charge transfer and electron detachment are significant electron-loss mechanisms for H$\sp{-}$(D$\sp{-}$); both processes exhibit velocity-dependent isotope effects for H$\sp{-}$ and D$\sp{-}$. $\sigma\sb{\rm cg}$(E) displays high energetic thresholds for Na and K (about 20 eV for H$\sp{-}$ + Na and 40 eV for H$\sp{-}$ + K) yet no obvious one for Cs. $\sigma\sb{\rm e}$(E) does not depend on the target as much as $\sigma\sb{\rm ct}$(E) and displays near zero-energy thresholds. The relative importance of charge transfer as an electron-loss mechanism decreases as the mass of the alkali-metal increases.

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22

Gale, Charles 1957. "Macroscopic and microscopic aspects of heavy ion collisions". Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73975.

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23

Caillat, Jérémie. "Etude théorique des processus électroniques au cours de collisions ion-atome et ion-molécule". Paris 6, 2003. http://www.theses.fr/2003PA066510.

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24

Ta, C. T. "A theoretical study of charge-transfer reactions in collisions between identical ions". Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378294.

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25

Renk, Thorsten. "QCD matter under extreme conditions heavy ion collisions /". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966327764.

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26

Støchkel, Kristian. "Electron-transfer processes in fast ion-atom collisions". Doctoral thesis, Stockholm : Department of Physics, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-732.

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27

Tabti, Rahma. "Soft dilepton production in ultrarelativistic heavy-ion collisions". Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23428.

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We investigate and compare two field theoretical formalisms, namely, the former state-of-the-art but noncovariant Ruckl formula-based formalism developed by K. Haglin and C. Gale, and a more recent covariant formalism developed by P. Lichard, for lepton pair production via soft virtual bremsstrahlung in hadronic reactions. A quantitative study of the discrepancy between both formalisms with regard to rates and total yields of $e sp{+}e sp{-}$ and $ mu sp{+} mu sp{-}$ pair production from radiative pion and quark (antiquark) scattering in ultrarelativistic heavy-ion collisions is made. Dilepton production rates are calculated using the independent particle approximation from kinetic theory, and total dilepton yields are obtained by integrating these rates over the space-time evolution of the heavy-ion collision as dictated by Bjorken's longitudinal hydrodynamic model. All rates and total yields of $e sp{+}e sp{-}$ and $ mu sp{+} mu sp{-}$ pair production with invariant masses less than 300 MeV turn out to be overestimated in the Ruckl formula-based formalism.

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28

Bertrand, Martine 1976. "Photon production in high energy heavy ion collisions". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31196.

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The production of photons in the energy range of 0 to 3 GeV is discussed as a signature of the creation of a quark-gluon plasma in ultrarelativistic nuclear collisions. However, they are also created in the hadronic phase. Therefore I investigate the role of the pirho → pigamma and pio → pigamma reactions in the photon emission from hot hadronic matter, and I compare their respective importance. These reactions are known to be the leading contributions. For this purpose I use diverse effective chiral Lagrangians that are in accord with known empirical properties of strong interaction. Then I discuss the relevance of my work to heavy ion collisions.

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29

Forster, Christine. "Aspects of charge exchange in ion-atom collisions". Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6189/.

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The straight line semi-classical Impact Parameter method has been modified for use with classical trajectories. Ion-atom collisions have been modelled using wavefunctions expanded in terms of atomic basis states which were centred on either the target or projectile ions. Total and differential charge exchange cross-sections are presented for (^4)He(^++) and (^4)He(^+) collisions within the centre of mass energy range 0.21 kev < E(_em) < 2.5 keV. Results using curved and straight line paths are compared with data from other authors. Significant trajectory effects were found at the lower energies in the range. The curved trajectory results were lower than those from the straight line model and also lower than previous calculations carried out. At higher energies in the range there was good agreement between straight line and curved trajectory models and previous work. Differential cross-sections were found to be sensitive to the trajectories employed, and comparisons have been made with previous work. Total, state specific and differential cross- sections for charge exchange are presented for Be(^++) and H collisions using a five state basis, within the centre of mass energy range 0.111 keV < E(_em) < 0.4444 keV. There was reasonable agreement between the straight line results and previous work. There were significant trajectory effects for all the final charge transfer states. Results are presented for low-energy collisions between positively charged muons and atomic hydrogen. An eight state basis has been used. Direct excitation cross sections for n = 2 atomic states and charge transfer cross sections to Is and n = 2 have been calculated. The effect on the cross sections of using different internuclear potentials has been examined. Trajectory effects were small for charge transfer to Is but were more pronounced in the direct excitation and charge exchange cross- sections to n = 2. These results have been compared to those obtained for curved trajectory H(^+) and H collisions at the same relative velocity, to assess the validity of velocity scaling. It was found that velocity scaling was reliable for charge transfer to Is and for total electron capture cross-sections. However, it was progressively inaccurate for direct excitation and for electron capture into excited states for µ(^+) impact energies of less than 300 eV. These results are discussed and suggestions for further work are made.

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30

Dunseath, Kevin Murray. "Transfer and ionisation processes in ion-atom collisions". Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335336.

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31

Song, Huichao. "Causal Viscous Hydrodynamics for Relativistic Heavy Ion Collisions". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250542758.

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32

Wertepny, Douglas E. "Two-Particle Correlations in Heavy-Light Ion Collisions". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1468596055.

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33

Wong, Michael. "Evolution of anisotropies in asymmetric heavy ion collisions". Connect to resource, 2009. http://hdl.handle.net/1811/37002.

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34

Weitz, Eamonn. "Theoretical developments for jets in heavy-ion collisions". Electronic Thesis or Diss., Nantes Université, 2023. http://www.theses.fr/2023NANU4063.

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Le plasma de quarks et de gluons (QGP) est une phase exotique de la matière composée de quarks et de gluons déconfinés. Il se forme brièvement lors des collisions d’ion lourds (HIC) au LHC et RHIC. Dans le cadre de ces collisions, des structures hautement énergétiques d'états finaux, connues sous le nom de jets, servent de sondes idéales. Ces jets pénètrent le QGP en chemin vers les détecteurs de particules. Lorsque le jet se propage il est éteint, perdant son énergie par son interaction avec le QGP. La théorie quantique des champs à température finale – la théorie des champs théoriques, est un outil extrêmement puissant qui est capable de quantifier analytiquement la façon dont un objet de si haute énergie interagit avec un bain thermique faiblement couplé. Dans cette thèse, notre travaille se concentre sur le calcul des corrections (dans l'expansion de la constante de couplage fort) de deux quantités, qui déterminent la manière dont les jets sont éteints par le QGP. Le premier est le coefficient d'élargissement du moment transverse, qui décrit comment le jet se diffuse dans l'espace du moment transverse par son interaction avec le milieu. Notre attention se porte sur le calcul des corrections logarithmiques associées à cette quantité. La seconde est la masse asymptotique, qui peut être considérée comme un changement dans la relation de dispersion du jet lorsqu'il subit une diffusion vers l'avant avec les constituants du milieu. Nous effectuons un calcul correspondant, en nous basant sur certains résultats de la littérature pour débarrasser les corrections classiques de la masse de toute divergence non physique, tout en commençant à compléter ses corrections complètes à une boucle
The quark-gluon plasma (QGP) is an exotic phase of matter, composed of deconfined quarks and gluons and is briefly created in heavy-ion collisions (HIC) at the LHC and at the RHIC. High-energy, self-collimated structures of final-state particles also created in HIC, called jets, probe the QGP, piercing through it on their way to the particle detector. In particular, as the jet propagates, it is quenched, shedding its energy through its interaction with the QGP. Quantum field theory at finite temperature – thermal field theory, is then an extremely powerful tool, capable of analytically quantifying how such a high-energy object interacts with a weakly coupled thermal bath. In this thesis, we work towards the computation of corrections (in the expansion of the strong coupling constant) to two quantities, which dictate how jets are quenched by the QGP. The first being the transverse momentum broadening coefficient, which describes how the jet diffuses in transverse momentum space through its interaction with the medium. We focus on the computation of logarithmically enhanced corrections, carefully showing how the thermal scale affects the logarithmic phase space. The second is the asymptotic mass, which can be thought of as a shift in the jet’s dispersion relation as it undergoes forward scattering with the medium’s constituents. We complete a matching calculation, which rids the mass’ classical corrections of any unphysical divergences, while also beginning the completion of its full two-loop, quantum corrections

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35

Frodermann, Evan S. "A view of heavy-ion collision dynamics and geometry through electromagnetic signatures". Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1219089772.

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36

Jolly, Mariette. "Study of many-body dynamics in ion-ion/atom collisions : a joint experimental and theoretical investigation". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS243.

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Étudier les collisions ion-atome et ion-ion permet d'appréhender les probabilités des processus électroniques tels que la capture, l'ionisation et/ou l'excitation en maîtrisant le nombre d'électrons initialement liés à chaque partenaire de la collision. En allant de l'étude d'un système à trois corps (les deux noyaux avec un seul électron) vers des systèmes plus complexes impliquant des électrons supplémentaires permet d'examiner des effets sur la dynamique globale des électrons et par conséquent sur les sections efficaces des processus élémentaires.Dans la section théorique de la thèse, des calculs de sections efficaces sont effectués pour des systèmes ion-atome et ion-ion contenant jusqu'à deux électrons. Le carbone, l'hydrogène, l'azote et l'hélium ont été choisis comme partenaires de collision. Cela est réalisé en utilisant une approximation semi-classique non perturbative, qui consiste à traiter le mouvement des ions de manière classique, tandis que la dynamique des électrons est décrite en utilisant la mécanique quantique. Les collisions sont simulées à l'aide d'un programme “collision solver”, à partir duquel des sections efficaces pour différents processus peuvent être extraites.La partie expérimentale de la thèse est dédiée au développement technique, aux tests et à la caractérisation de divers instruments essentiels pour la réalisation d'expériences précises de collision ion-atome et ion-ion. Deux sources d'ions et les lignes de faisceau correspondantes ont été installées pour réaliser des collisions ion-ion garantissant qu'une large gamme de conditions expérimentales et de types de collisions. Une chambre de collision, un jet gazeux, un spectromètre d'ions et son détecteur associé, un système de détection de rayons X ont été développés et caractérisées pour réaliser les premières études.Dans l'ensemble, cette thèse combine de nouveaux calculs théoriques pour les collisions ion-atome et ion-ion avec des avancées expérimentales vers une configuration capable d'explorer une large gamme de systèmes de collision. Cette double approche est très bénéfique pour améliorer la compréhension de la dynamique des électrons dans les collisions ion-matière. Ces connaissances sont essentielles tant pour la recherche fondamentale que pour les applications pratiques dans divers domaines scientifiques et technologiques, tels que les plasmas astrophysiques, la recherche sur la fusion par confinement inertiel ou encore l'hadronthérapie
Studying ion-atom and ion-ion collisions allows us to understand the probabilities of electronic processes such as capture, ionization, and/or excitation by controlling the number of electrons initially bound to each collision partner. By progressing from the study of a three-body system (the two nuclei with a single electron) to more complex systems involving additional electrons, we can examine the effects on the overall electron dynamics and consequently on the cross-sections of elementary processes.In the theoretical section of the thesis, cross-section calculations are performed for ion-atom and ion-ion systems containing up to two electrons. Carbon, hydrogen, nitrogen, helium and their respective ions have been chosen as collision partners. This is achieved using a semi-classical non-perturbative approach: the relative motion of the partners is treated classically, while the electron dynamics is described quantally. The collisions are simulated using a “collision solver” program, from which cross sections for different processes can be extracted.The experimental part of the thesis is dedicated to the technical development, rigorous testing, and thorough characterization of various instruments critical for conducting precise ion-atom and ion-ion collision experiments. Two ion sources and their respective beamlines were set up to perform ion ion collisions, ensuring a large range of possible experimental conditions and collision systems can be explored. A collision chamber, gaseous jet, an ion spectrometer and its associated detector, as well as an x-ray detection system were developed and characterized to perform the preliminary experiments.Overall, this thesis combines new theoretical calculations for ion-atom and ion-ion collisions with experimental advancements towards a set-up capable of exploring a wide range of collision systems. The dual approach is very beneficial for enhancing the understanding of electron dynamics in ion-matter collisions. This knowledge is essential for both fundamental research and practical applications in various scientific and technological fields, such as astrophysical plasma, inertial confinement fusion research or hadrontherapy

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37

Xu, Yaodong. "Applications of mass spectrometric techniques to charge-transfer processes and cluster ion reactions". Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/26208.

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38

Nesbitt, Brian. "Heavy-particle collisions". Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301028.

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39

Kuhlman, Anthony Joseph. "The beginning and end of relativistic heavy ion collisions using uranium beams and Bose-Einstein correlations as probes of the collision fireball /". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1185456181.

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40

Devismes, Anne. "K+ production in heavy ion collisions at 1.5 AGeV". [S.l.] : [s.n.], 2000. http://elib.tu-darmstadt.de/diss/000154/these.pdf.

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41

Rozsályi, Emese Tünde. "Theoretical study of charge transfer in ion-molecule collisions". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10152/document.

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Les processus de transfert de charge sont très importants dans de nombreux domaines de la physique et de la chimie. Ils interviennent en particulier dans la conception ds plasmas astrophysiques ainsi que des plasmas de fusion. Les particules secondaires, électrons lents ou ions, générés le long du trajet des radiations jouent également un rôle crucial dans l’action des radaitions sur le milieu biologique, en relation en particulier avec les traitements du cancer. Il est donc fondamental d’avoir une connaissance approfondie des mécanismes mis en jeu dans ce type de processus, à l’échelle moléculaire. Pour cela, nous avons étudié dans cette thèse deux systèmes voisins, la collision des ions C2+ avec les molécules HF et HCI afin d’ananllyser en détail le mécanisme de transfert de charge dans ces deux réactions en d’en déduire des éléments permettant d’avoir une vue plus générals de ce type de processus. Nous nous sommes en particulier intéressés à l’anisotropie de la réaction de transfert de charge ainsi qu’aux effets dus à la vibration de la molécule diatomique cible lors de la collision. Une étude comparée des ces deux système a montré un mécanisme différent dans chaque cas liés aux interactions non-adiabatiques mises en jeu
Collisiosns of slow multiply charged ions with molecular species have been widely investigated in the past few years. Imortant experimental and theoretical effort has been focused on reactions with simple targets. Consideration of more complex molecular targets are now of increasing interest, in particular with regardto possible direect or indirect processes occuring in the irradiation of the biological medium.. In these reactions generally at relativity low energies, different processes have to be considered: exitation and fragmentation on the molecule, ionization of the gaseous target, and also possible charge transfer from the multicharged ion toward the biomolecule..Charge transfer can be investigated theoretically in the framework of the molecular representation of the collision. Such studies provides important information on the mecanism as well as on the electronic structure of the projectile and target during the reaction. The charge-transfer process in collisions on C2+ ions with hydrogen halide molecule (HF, HCI) has been studied by means of ab initio quantum chemistry molecular methods followed by semiclassical dynamical treatment in the keV collision energy range. The mechanism has been investigated in detail in each reaction, in connection with nonadiabatic interactions around avoided crodssings between states involved in the process

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42

Green, P. S. "Theory of double charge transfer in ion-atom collisions". Thesis, Swansea University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637093.

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A theory of double-charge-transfer processes in ion-atom collisions has been developed. The collision energies of interest, in the range 3-10 keV permit the use of semi-classical impact parameter formalism within which Landau-Zener theory has been adapted to describe the coupling that arises indirectly from 2 virtual 1-electron transitions, necessary because the direct 2-electron coupling amplitudes are insignificant in comparison. A consistent treatment of adiabatic and diabatic potential energy curves and techniques needed to locate crossings of the latter type are given. Application to scattering of OH⁺ and F⁺ by inert gas atoms require a systematic treatment of non spherical p atomic orbitals in the theory. Explicit rotations from space-fixed to body-fixed co-ordinates at each point in the scattering trajectory revealed that the theory can predict effects, which in theories involving only s orbitals require a rotational coupling operator, in the absence of such coupling. Cross sections for various double-charge-transfer scattering processes are calculated, employing established model 1-electron transfer scattering amplitudes and reproduced well the experimentally observed "reaction windows" of projectile energy loss within which the cross sections are significant. General kinematic factors, rather than the inclusion of a systematic treatment of the non-spherical p orbitals involved in the reactions studied, are primarily responsible for the form of the reaction window.

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43

Rozsalyi, Emese Tünde. "Theoretical study of charge transfer in ion-molecule collisions". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-01070739.

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Les processus de transfert de charge sont très importants dans de nombreux domaines de la physique et de la chimie. Ils interviennent en particulier dans la conception ds plasmas astrophysiques ainsi que des plasmas de fusion. Les particules secondaires, électrons lents ou ions, générés le long du trajet des radiations jouent également un rôle crucial dans l'action des radaitions sur le milieu biologique, en relation en particulier avec les traitements du cancer. Il est donc fondamental d'avoir une connaissance approfondie des mécanismes mis en jeu dans ce type de processus, à l'échelle moléculaire. Pour cela, nous avons étudié dans cette thèse deux systèmes voisins, la collision des ions C2+ avec les molécules HF et HCI afin d'ananllyser en détail le mécanisme de transfert de charge dans ces deux réactions en d'en déduire des éléments permettant d'avoir une vue plus générals de ce type de processus. Nous nous sommes en particulier intéressés à l'anisotropie de la réaction de transfert de charge ainsi qu'aux effets dus à la vibration de la molécule diatomique cible lors de la collision. Une étude comparée des ces deux système a montré un mécanisme différent dans chaque cas liés aux interactions non-adiabatiques mises en jeu

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44

Lee, R. J. S. "Ion-atom collisions at relativistic and non-relativistic energies". Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368591.

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45

Marshall, David Paul. "The role of correlation in inelastic ion-atom collisions". Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238989.

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46

Barton, Robert Allan. "Multi-strange hyperon production in relativistic heavy -ion collisions". Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367744.

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47

Greenfield, Anthony Charles. "The theory of electron transfer during ion-surface collisions". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46321.

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48

Ritchie, Robert Alexander. "J/Ψ suppression in ultra-relativistic heavy ion collisions". Thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/26225.

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49

Alqahtani, Mubarak Aydh K. "QUASIPARTICLE ANISOTROPIC HYDRODYNAMICS IN ULTRA-RELATIVISTIC HEAVY-ION COLLISIONS". Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1512385855986591.

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50

Gannouni, Mohamed Achref. "Approche théorique des collisions réactives de type ion-molécule". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1108/document.

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La collision entre l'ion hydroxyle (OH+) et l'atome d'hydrogène (H) joue un rôle majeur en physico-chimie de l'atmosphère et en astrophysique. Pour l'étude de ce système, nous avons générés la surface d'énergie potentielle tridimensionnelle (SEP-3D) globale doublet de la réaction H + OH+ --- H2O+ (X2B1)--- O + H2+. Les calculs électroniques ont été effectués au niveau MRCI avec la base aug-cc-pV5Z en incluant la correction des erreurs de superposition de base (BSSE). Cette SEP couvre la région moléculaire et les régions des longues portées pour les différents canaux : OH+ + H, O + H2+ et la réaction d'échange d'hydrogène. La qualité de la SEP a été validée après une comparaison des constantes spectroscopiques de H2O+ (X2B1) et des fragments diatomiques, des niveaux rovibroniques de H2O+ (X2B1), l'énergie de dissociation et de la barrière à linéarité pour H2O+ (X2B1) aux données expérimentales et théoriques existantes. Un bon accord est trouvé. Après avoir déterminé la SEP, nous avons utilisé les outils de la dynamique quantique indépendante du temps pour calculer les sections efficaces élastiques et inélastiques désexcitation de OH+ (v=0, j=1, 2, 3, 4, 5, 6 et 7) en collision avec l'atome d'hydrogène sur un large domaine d'énergie cinétique. Nous avons ainsi déterminé les taux désexcitation rotationnelle pour des températures allant de 10 à 200K. Nous avons également utilisé la surface quadruplet de Martinez et al. pour déduire ces taux désexcitation. Les résultats montrent que les sections efficaces inélastiques calculées sur la surface doublet sont en moyenne au moins deux à trois fois plus importantes que leurs correspondantes obtenues sur la surface quartet. Les potentiels à longue portée des deux surfaces étant identiques, ce résultat montre qu'un modèle basé sur la seule longue portée du potentiel ne pourrait pas rendre compte de la dynamique inélastique de ce système
The collision between the hydroxyl cation (OH+) and hydrogen atoms (H) plays a major role in physical chemistry of the atmosphere and astrophysics. To study this system, we generated the global three-dimensional potential energy surface (3D-PES) of the reaction H + OH+ ---- H2O+ (X2B1) ---- O + H2+. The electronic calculations were performed at the MRCI level with aug-cc-pV5Z basis including the basis set superposition error (BSSE) correction. This PES covers the molecular region and the long ranges close to the OH+ + H, O + H2+ and the hydrogen exchange channels. The quality of the PES is checked after comparison of the spectroscopic constants of H2O+ (X2B1) and of the diatomic fragments, the rovibronic levels, the dissociation energy, and the barrier to linearity of H2O+ (X2B1) to available experimental and theoretical data. A good agreement is found. Then, we used the tools of time-independent Quantum Dynamics to calculate the elastic and inelastic cross sections for the de-excitation of OH+ in collision with the hydrogen atom over a wide range of kinetic energy. We have thus determined the rotational de-excitation rate coefficients for temperatures ranging from 10 up to 200K. The results show that the inelastic cross sections on the doublet surface are on average at least two to three times larger than their cross section obtained on the previously computed cross sections using the quartet surface. Since, the long range parts of the doublet and the quartet PESs are identical, our work invalidates hence previous cross section determination. When only long range potentials are considered. Therefore, we recommend using fully the global 3D PES for scattering and reactive collision relevant for atmospheric and astrophysical studies

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