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Simulation de la dissociation d'agrégats d'hydrogène
Hn+ (5 ≤ n ≤ 39) induite par collision avec un atome d'hélium à haute vitesse (V > VBohr).

Abstract : The fragmentation of atomic and molecular clusters induced by energy deposition represents a fundamental interest for the physics of particle-matter or radiance-matter interactions. Experiences carried out at the IPNL (Institut de Physique Nucléaire de Lyon) demonstrated that this fragmentation is made according to several channels including evaporation, dissociation or multi-fragmentation. These different channels undergoing several mechanisms according to the degree of excitation or ionization or multi-ionization that reveal an individual character (Rotational or vibrational excitation of the constituent of the cluster) or a collective character such as the intermolecular reactivity which can explain multi-fragmentation process.

In this work, we elaborated and developed a Monte Carlo simulation code in order to study these different channels and mechanisms of dissociation of clusters H3+(H2)m (1 ≤ m ≤ 18) by impact of helium atoms at the energy of 60 keV/amu. This simulation is based both on the knowledge of the geometrical structures of the clusters and the individual dissociation cross sections of the constituent H3+ and H2.
The interaction is studied in the center of mass of the cluster using an inverse kinematic approach.
The obtained results allowed to go back up to the total cross sections of dissociation as well as the partial cross sections of some channels such as : electron capturing, simple ionization and multi-ionization.

This simulation can be also used for the study of the evaporation and to the multi-fragmentation by including routines taking into account these phenomena.
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https://tel.archives-ouvertes.fr/tel-00392739
Contributor : Khalid Samraoui <>
Submitted on : Thursday, October 13, 2011 - 5:40:35 PM
Last modification on : Tuesday, November 19, 2019 - 2:42:02 AM

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  • HAL Id : tel-00392739, version 2

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Khalid Samraoui. Simulation de la dissociation d'agrégats d'hydrogène
Hn+ (5 ≤ n ≤ 39) induite par collision avec un atome d'hélium à haute vitesse (V > VBohr).. Physique [physics]. Faculté des Sciences Ben M'sick de Casablanca, 2008. Français. ⟨tel-00392739v2⟩

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