Abstract
Using recoil-ion momentum spectroscopy, combined with a multihit detector system, the full momentum vectors of both fragment ions produced by fragmentation of D2 by fast 50-kV protons and slow (9.56–0.191 keV/u) keV/u! Xe26+ ions have been measured. The data are kinematically complete and make it possible to separate the laboratory momentum of the center of mass of the molecule from the momentum of each fragment in the center-of-mass system of the molecule. Using this separation, we find that, for higher collision velocities, the overall reaction can be described as double-electron capture, followed in a second and separate step by a Coulomb explosion of the doubly charged D2 molecule. For the lowest collision velocities, however, the projectile remains in the vicinity of the molecule during the fragmentation, and this clean separation of steps is lost. The projectile is found to extract internal energy from the molecule, thus leading to less energetic fragments in the center-of-mass system of the molecule. This effect causes a distortion in the spherical momentum images, as shown by the two-dimensional momentum distributions in the collision plane. The experimental results are found to be in good agreement with five-body classical trajectory Monte Carlo calculations. © 2001 The American Physical Society.
Recommended Citation
I. Ali et al., "Dynamics of the Fragmentation of D2 by Fast Protons and Slow Highly Charged Xe26+," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 64, no. 2, p. 10, American Physical Society, Jan 2001.
The definitive version is available at https://doi.org/10.1103/PhysRevA.64.022712
Department(s)
Physics
International Standard Serial Number (ISSN)
1094-1622; 1050-2947
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Physical Society, All rights reserved.
Publication Date
01 Jan 2001
