Emitted electron spectra from doubly-excited states 1s2nln'l' of Be-like ions produced by the collisions of O6+ and C4+ ions with alkaline-earth atoms

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, , Citation S Machida et al 1997 Phys. Scr. 1997 209 DOI 10.1088/0031-8949/1997/T73/064

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Author affiliations

1 Institute for Laser Science, University of Electro-Communications, Chofu, Tokyo 182, Japan

2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-11, Japan

3 Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188, Japan

4 Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102, Japan

Dates

  1. Received 23 September 1996

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1402-4896/1997/T73/209

Abstract

Electron spectra ejected from doubly excited states of Be-like ions produced by two electron capture processes in O6+ + Ca, C4+ + Mg and C4+ + Ca collisions have been measured by means of high resolution zerodegree electron spectroscopy. For the O6+ + Ca collision, spectra from the 1s24lnl' and 1s25lnl' states are observed in addition to those from the 1s23lnl' states in which n equals six or larger. For the C4+ + Mg and Ca collisions, spectra from the 1s23lnl' and 1s24lnl' states are observed. Population distributions of the states are explained as a whole using the concept of the reaction window based on the extended classical over-barrier model by Niehaus.

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10.1088/0031-8949/1997/T73/064