SINGLE ELECTRON-CAPTURE IN SLOW HE-2+-LI COLLISIONS

Optical measurements of single electron capture in He**2** plus -Li collisions are reported in the energy range 0. 55-10 kev/amu. Cross sections for emission of the 1s-np (n equals 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 sigma //1 and the subshell-selective capture cross sections sigma //3//p and sigma //4//p. Correction factors connected with the polarization of the emitted radiation were applied to our data, using theoretical results of Fritsch and Lin, who calculated capture cross sections for nlm-states.