Abstract
A five-body classical trajectory Monte Carlo model has been used to study double-electron removal from H2 by collisions with highly charged ions. The final-state correlations between ionized protons and projectile are calculated for Xe23+ impact on H2 at collisions energies ranging from 2.6 eVu-1 to 2.6 keVu-1. In the center-of-mass frame of the recoiling protons, as the projectile energy decreases the proton energy distribution broadens considerably and also shifts to lower energies relative to that for an isolated molecule Franck-Condon transition. At low collision energies the protons are found to be scattered to the forward direction with large transverse momenta opposite to that of the projectile. The strong forward momenta are a signature of three-body dynamics with the protons Coulomb exploding against the projectile on the incoming portion of the trajectory. Investigation of the centre-of-mass momenta of the protons reveals a significant anisotropy of the proton angular distributions. At the lowest collision energies, there is a strong preference for the protons to be aligned parallel to the projectile direction. This behaviour, combined with their low centre-of-mass energies, implies that the protons are formed along the electric field vector of the incoming projectile concurrent with stretching of the molecular bond. The bond stretching is important only when the collision time is long (tens to femtoseconds) compared with the dissociation time of the molecule.
Recommended Citation
R. E. Olson and C. R. Feeler, "Double-electron Removal from H2 by Slow, Highly Charged Xe²³⁺ Ions," Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 34, no. 7, pp. 1163 - 1174, IOP Publishing, Apr 2001.
The definitive version is available at https://doi.org/10.1088/0953-4075/34/7/301
Department(s)
Physics
International Standard Serial Number (ISSN)
0953-4075
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 IOP Publishing, All rights reserved.
Publication Date
14 Apr 2001
