Ionisation d'atomes, de molécules et de biomolécules par impact des ions multichargés de hautes énergies : comparaison quantique et Classique

Abstract : The collisionnal ionizing processes type ion-atom or molecule are fundamental in several fields of physics, and more recently in nuclear medicine. The current theories, quantum or semi-classical, can not deal with large molecular targets as biomolecules. To solve this problem we have developed a method purely classical. In this work we present our model, which is based on two other classical approximations: Classical Over-Barrier (COB) and Classical Trajectory Monte Carlo (CTMC). This model is designed specifically to the study of collisions of multiply charged ions with atoms or molecules. This model allows us to calculate the cross sections, for capture or ionization, singles or multiples. We have applied it, first, on simple atomic or molecular targets (H, He, H2 and H2O) for which many experimental or theoretical data are available. These calculations have allowed us to check the validity of our model for targets like biomolecules. We have applied the model on two of biomolecules constituent of DNA (Adenine and Cytosine), which is impossible to achieve with approximations currently available.
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Issam Abbas. Ionisation d'atomes, de molécules et de biomolécules par impact des ions multichargés de hautes énergies : comparaison quantique et Classique. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ007S⟩. ⟨tel-01752569⟩

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