Experimental study of single- and double-electron transfer in slow ne8++he collisions using photon and electron spectroscopy. By A. Langereis et al.

In this Comment we question the recent emphasis by Langereis et al. [Phys. Rev. A 60, 2917 (1999)] that excitation of triplet states in double-capture processes is noticeable in the Ne 8 + (1s 2 ) 1 S+He(1s 2 ) 1 S collisionalsystem at 80 keV. We demonstrate that all their identified Ne 6 + (1s 2 3lnl') autoionizing transitions can be perfectly explained by excitation of singlet states alone. In our opinion their findings based on electron spectroscopy rely on too inaccurate spectrum analysis and theoretical input data.