Abstract
Optical measurements of single electron capture in He 2+ -Li collisions are reported in the energy range 0.55–10keV/amu. These low energies were inaccessible in our earlier work on the same system [1]. Cross sections for emission of the 1s− np ( n = 2, 3, 4) Lyman series of He II have been measured with a VUV grazing incidence spectrometer. From these we have deduced the total capture cross section σ t, and the subshell-selective capture cross sections σ 3p and σ 4p. Correction factors connected with the polarisation of the emitted radiation were applied to our data, using theoretical results of Fritsch and Lin [2], who calculated capture cross sections for nlm− states. Our results for σ t, are in excellent agreement with very recent charge state selection measurements by Varghese et al. [3]. Both the total and the partial cross sections agree very well with theoretical results by Fritsch and Lin [2]. Comparison with other experimental and theoretical results is also made.
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