Atomic data for opacity calculations. VIII. Line-profile parameters for 42 transitions in Li-like and Be-like ions

Abstract

Widths and shifts are calculated in the electron impact approximation, using close-coupling theory, for the transitions 2s-2p, 2s-3p, 2p-3s, 2p-3d, 3s-3p and 3p-3d in Be II, B III, C IV, O VI and Ne VIII, and the transitions 2s2 1S-2s2p 1Po, 2s2p 3Po-2p2 3P, 2s2p 1Po-2p2 1D and 1S in C III, O V and Ne VII. Results are compared with those from previous calculations and from experiments. Approximate formulae must be used to estimate linewidths for some 106 transitions which are of importance for the calculation of stellar envelope opacities. Results for the quantum mechanical calculations for 42 transitions are used to obtain provisional best estimates for the parameters in these formulae.