Molecular fragmentation by slow highly charged ion impact
University of Missouri-Rolla - Rolla, MO 65401, USA
2 KVI Atomic Physics, Rijksuniversiteit Groningen 9747AA Groningen, The Netherlands
Accepted: 1 November 1999
An experimental and theoretical study is presented for fragmentation of D2 after double-electron removal by slow (1–20 kV) highly charged ion impact (Xe10+/19+ and O5+/6+). As the ratio of the charge state to speed of the incoming ion increases, the D+ fragment energies deviate significantly from those found for isolated-molecule Franck-Condon transitions between states of D2. Both higher and lower fragment energies are observed, in accordance with predictions based on a Classical Trajectory Monte Carlo model. These energies result from the collisional momentum transfer to the center of mass of the molecule combined with the normal two-body breakup of D+ + D+. At the lowest energies, theory predicts a deviation from this vector addition picture due to the high field of the slow projectile.
PACS: 34.50.Gb – Electronic excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.) / 34.70.+e – Charge transfer / 82.30.Fi – Ion-molecule, ion-ion, and charge-transfer reactions
© EDP Sciences, 2000