Absolute total cross sections for electron capture between slow, highly charged ions and alkali targets have been recently measured. It is found that these cross sections follow a scaling law with the projectile charge which is different from the one previously proposed which is based on a classical over-barrier model (OBM) and verified using rare gases and molecules as targets. In this paper we develop a 'semiclassical' (i.e. including some quantal features) OBM in an attempt to recover experimental results. The method is then applied to ion-hydrogen collisions and compared with the result of a sophisticated quantum mechanical calculation. In both cases the present method is found to underestimate the correct result by a factor of two, but, where comparison can be made, it is superior to other OBMs. A qualitative explanation for the discrepancies is also given. © 2000 IOP Publishing Ltd.
|Pages (from-to)||861 - 867|
|Number of pages||7|
|Journal||Journal of Physics B: Atomic, Molecular and Optical Physics|
|Publication status||Published - 14 Mar 2000|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics