Fragmentation of H2 and HD Molecules by C⁶⁺ Impact

Abstract

A five-body classical trajectory Monte Carlo model has been developed to study fragmentation of H2 and HD after double electron removal collisions by highly charged ions. The theoretical model includes all two-body Coulomb interactions in the post-collision regime. A systematic study of the energy partitioning between the nuclei has been made for C6+ impact from 1 eV/u to 1 MeV/u. Major deviation from isolated molecule Franck-Condon behavior is found for impact energies E ≤ 1 keV/u. At the lowest impact energies the target ions are very energetic with a strong contribution being from collisional transfer from the projectile. The target ion energy spectra at high impact energy is due to the Coulomb explosion of the isolated doubly ionized molecule in the known Franck-Condon transition, resulting in a distinct separation of the energy peaks for the HD isotope. At energies around 10 eV/u to 1 keV/u, or projectile charge divided by speed of q/v ≈ 30-300, both slow and fast target ions are observed which result from the competition between the momentum transfered during the collision with that from the Coulomb dissociation of the two ions.

Department(s)

Physics

International Standard Serial Number (ISSN)

0281-1847

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 IOP Publishing, All rights reserved.

Publication Date

01 Dec 1999

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