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

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 2s 2 1 S-2s2p 1 P o , 2s2p 3 P o -2p 2 3 P, 2s2p 1 P o -2p 2 1 D and 1 S 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 10 6 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.