The classical limit of ionization in fast ion-atom collisions
- 28 September 1993
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 26 (18) , 3101-3122
- https://doi.org/10.1088/0953-4075/26/18/018
Abstract
The authors study the classical-quantum correspondence for ionization in three-body fast ion-atom collisions. The existence of a classical limit of the quantum mechanical transition probabilities as a function of the momentum transferred to the electron during the collision, the impact parameter, the energy and angle of the emitted electron, and the initial quantum level of the target is investigated. A well behaved classical limit is shown to exist for large momentum transfers whereas ionization by small momentum transfers or at large impact parameters is shown to be classically suppressed. It is found that ionization at small impact parameters does not possess a well-defined classical limit. Modifications of classical trajectory Monte Carlo (CTMC) methods to account for non-classical ionization are suggested. Applications related to recent data for electron ejection into large angles are presented.Keywords
This publication has 45 references indexed in Scilit:
- Classical calculation of high-energy electron capture in 5-MeV proton-hydrogen collisionsPhysical Review A, 1992
- Backward peak in the electron spectrum from collisions of 70-keV protons with a target from a hydrogen-atom sourcePhysical Review Letters, 1992
- Some Nordsieck integrals of interest in radiation and atomic collision theoriesComputer Physics Communications, 1992
- Vector spherical harmonics and scattering integralsPhysica Scripta, 1992
- Two-centre effects in ionization by ion impactJournal of Physics B: Atomic, Molecular and Optical Physics, 1991
- On the quantum foundations of some classical approximations for ion-atom collisionsJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Quantum collision theory with phase-space distributionsReviews of Modern Physics, 1983
- Differential cross sections for ejection of electrons from helium by protonsAtomic Data and Nuclear Data Tables, 1976
- Angular distribution of electrons ejected by charged particles: IV. Combined classical and quantum-mechanical treatmentPhysica B+C, 1975
- Angular distribution of electrons ejected by charged particles: I. Ionization of He and H2 by protonsPhysica, 1970