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Etude de l'émission électronique induite par impact d'ion multichargé sur la molécule D2

Abstract : Dissociative ionisation mechanisms induced in collisions involving a highly charged ion (S15+ 13.6 MeV/u) and a molecular deuterium target, have been studied through momentum vector correlations of both the D+ fragments and the electrons produced. An experimental apparatus has been developed in order to detect in coincidence all the charged particles produced during the collision. Measurement of their momentum vectors, which allows to determine both their kinetic energy and direction of emission with respect to the projectile one, combines Time of Flight, Position Sensitive Detection, and multi-coïncidence techniques. The correlation of the fragment and electron kinetic energies enables not only to determine branching ratios between the dissociative ionisation pathways, but also to separate unambigously kinetic energy distributions of fragments associated to each process. Finally, angular distributions of ejected electrons, as a function of the orientation of the molecular axis with respect to the projectile direction are deduced from the spatial correlation. Measurements are compared to theoretical angular distributions obtained using the CDW-EIS method.
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https://tel.archives-ouvertes.fr/tel-00203026
Contributor : Guillaume Laurent <>
Submitted on : Tuesday, January 8, 2008 - 4:13:16 PM
Last modification on : Friday, March 5, 2021 - 3:01:04 PM
Long-term archiving on: : Tuesday, April 13, 2010 - 4:43:31 PM

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  • HAL Id : tel-00203026, version 1

Citation

Guillaume Laurent. Etude de l'émission électronique induite par impact d'ion multichargé sur la molécule D2. Physique Atomique [physics.atom-ph]. Université de Caen, 2004. Français. ⟨tel-00203026⟩

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