The influence of angular momentum on double electron capture by highly charged ions

14 March 1992

journal article
Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics

Vol. 25 (5) , 987-999
https://doi.org/10.1088/0953-4075/25/5/012

Abstract

Double electron capture during collisions of highly charged ions with H₂ or He is studied by measuring and analyzing energy spectra of the resulting autoionization electrons and by comparing the experimentally determined population probabilities for the various states with those calculated from a simple classical model. This model is based on the extended classical over-barrier model (ECBM), modified by taking additionally the angular momenta of the exchanged electrons into account. Reasonable agreement between measured and calculated population probabilities for the highly correlated two-electron states is obtained especially for the cases of fully stripped projectiles, although correlation during the exchange process is neglected in the theoretical description. The success of the model implies that highly oriented doubly excited states result from the capture process.

Keywords

This publication has 17 references indexed in Scilit:

Magnetic substates populated by double-electron capture
Physical Review A, 1991
Orientation and alignment effects for capture in multiply charged-ion–atom collisions
Physical Review Letters, 1990
Resonance parameters and properties of beryllium-like doubly excited states: 4 ≤ Z ≤ 10
Atomic Data and Nuclear Data Tables, 1990
State-selective double-electron capture in ${He}^{2 +}$ + He collisions at intermediate impact energies
Physical Review A, 1989
Angular momentum of captured electrons: The classical over-barrier model and its limitations
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1987
Resonance positions and widths of doubly excited $N^{5 +}$ ions associated withN=3, 4, and 5 $N^{6 +}$ thresholds
Physical Review A, 1987
Angular momentum distribution in the classical over-barrier model for electron capture into highly charged slow projectiles
Journal of Physics B: Atomic and Molecular Physics, 1986
Observation of Polarized Optical Radiation following Electron Capture into Slow, Highly Ionized Neon
Physical Review Letters, 1985
The ECR ion source and associated equipment at the KVI
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1985
Electron-impact excitation of hydrogenic ions
Physical Review A, 1981