Energy and angular distributions of detached electrons in a solvable model of ion-atom collisions
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1501 (United States)
- Macedonian Academy of Sciences and Arts, Research Center for Energy and Informatics, P.O. Box 428, 91000 Skopje, (Macedonia)
Electron energy and angular distributions are computed for a model of atom{endash}negative-ion collisions. In this model, electron-atom interactions are represented by zero-range potentials in an approximation where two identical atoms move along straight-line classical trajectories in head-on collisions. Analytic expressions for the ionization amplitudes are interpreted in terms of Sturmian eigenvalues and eigenfunctions. At high velocity, the computed distributions exhibit direct excitation and continuum capture cusps in addition to the binary encounter ridge. At low velocities, a single feature corresponding to an electron distribution centered midway between the target and projectile emerges. For initial conditions corresponding to gerade symmetry a single broad peak appears, while for ungerade symmetry there is a node at the midpoint so that the peak splits into two parts. It is confirmed that the advanced adiabatic approximation gives an accurate description of the ungerade distribution at low and intermediate velocities. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 365885
- Journal Information:
- Physical Review A, Vol. 60, Issue 2; Other Information: PBD: Aug 1999
- Country of Publication:
- United States
- Language:
- English
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