Semiclassical convergent calculations for the electron-impact broadening and shift of some lines of neutral helium in a hot plasma

A theoretical formalism, which is the semiclassical analog of a unitarized Bethe-Born approximation, is used to calculate the broadening and shift, produced by electronic collisions, of some lines (7281, 7065, 6678, 5876, 5048, 5016, 4713, 4121, 3965, 3889, 3188, and 2945 Å) of neutral helium in a hot plasma. The effects of the ions are also taken into account by using the approach developed by Griem et al. Our theoretical predictions are compared with the experimental results of Wulff, Berg et al., Kelleher, and Diatta.