Subshell-Selective Electron-Capture From Lithium By Slow Multiply Charged Ions

Absolute cross sections for ( n , l ) subshell-selective electron capture in C 4+ -Li(2s) collisions at ion impact energies of 20–80 keV have been measured and compared with corresponding recent calculations. It is also shown that for capture from Li(2s) by various Be-like (C 2+ , N 3+ , C 4+ ) and B-like (N 2+ ) multiply charged ions the electronic configurations of the primary ions remain practically unchanged (“core conservation”). The latter feature could be utilized to measure the metastable fractions of beams of these ions. Finally, it is demonstrated in which way the subshell-selective capture from Li atoms can serve for detailed information on impurity transport in magnetically confined plasmas.