Étude expérimentale de la fragmentation d'agrégats d'eau induite par impact d'ions multichargés

Rémi Maisonny 1
1 AMA - Atomes, Molécules et Agrégats
CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
Abstract : This work deals with the fragmentation of neutral water clusters induced by collisions with slow and swift multiply charged ions. Strong projectile charge dependence is found for all of the fragmentation patterns in the charge transfer regime. When increasing the projectile charge (from q = 2 to q = 20), we observe a modification of the scenario of the fragmentation dynamics with a transition from a partial dissociation to a full cluster explosion. We observe that water clusters are more strongly heated by Xe20+ than by He2+. These results are in contrast to the generally accepted idea that highly charged ions are an efficient tool to ionize the target at large impact parameters without a huge amount of energy transfer. The results obtained with high energy projectiles Ni25+ i.e. in the ionization regime, are very similar than those obtained with low velocity Xe20+ i.e. in the charge transfer regime. These results suggest that even if the primary mechanism is different, the "same" electrons are into play and ejected from the target. In this work, we have also produced size-selected protonated water clusters by the coupling of an ElectroSpray Ion source together with a quadrupole mass filter. In order to perform, in the next future, collisions between these size-selected water clusters and projectile ions, we designed and realized a new experimental device which allows us to produce intense singly charged ions beams.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00651459
Contributor : Rémi Maisonny <>
Submitted on : Tuesday, December 13, 2011 - 4:23:01 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:42 PM
Long-term archiving on : Wednesday, March 14, 2012 - 2:26:30 AM

Identifiers

  • HAL Id : tel-00651459, version 1

Citation

Rémi Maisonny. Étude expérimentale de la fragmentation d'agrégats d'eau induite par impact d'ions multichargés. Physique Atomique [physics.atom-ph]. Université de Caen, 2011. Français. ⟨tel-00651459⟩

Share

Metrics

Record views

453

Files downloads

1193