Orbital alignment dependence of electron transfer cross sections. IV: 1-15 keV Ne+, Ar+-Na(3p) collisions

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This paper reports experimental results for the influence of target excitation and orbital alignment on the charge exchange process for the systems Ne+, Ar+-Na(3s, 3p) for impact energies in the 1-15 keV range. The cross section parameters are found to depend sensitively on collision velocity and choice of projectile. Using earlier results by Aumayr et al (Z. Phys. D 6 (1987) 145-153) for the Na(3s) target, the relative cross sections are put on an absolute scale. A strong dependence of the total electron transfer cross section on the target state is observed, most dramatically for low energy Ar+ impact for which the cross section for a Na(3p) target is more than 200 times larger than for Na(3s). Time-of-flight spectra show that electron transfer channels with energy defects near zero are strongly preferred. Cross section estimates based on the Demkov-Olson model account well for the major trends observed, but not for the detailed behavior.

Original languageEnglish
JournalZeitschrift fur Physik D-Atoms Molecules and Clusters
Volume37
Issue number2
Pages (from-to)133-139
Number of pages7
ISSN0178-7683
DOIs
Publication statusPublished - May 1996

ID: 229311105