  Recent experimental and theoretical (both improved semiclassical and fully
quantum-mechanical) results for B III and Ne VII delta n = 0 transitions with n
= 2 or 3, respectively, are discussed. The probable reasons for disagreements
by about a factor of 2 between the fully quantum-mechanically calculated and
both measured and semiclassically calculated widths can be explained in terms
of violation of validity criteria and non-thermal Doppler effects. More
independent determinations of line widths for multiply-ionized non-hydrogenic
ions are called for, but meanwhile caution should be exercised in the use of
corresponding semiclassically calculated widths, e.g., in opacity calculations
or for plasma density diagnostics. Only the quantum calculations allow a clear
separation of elastic and inelastic scattering contributions to the width. For
B III, elastic scattering contributes about 30% whereas for Ne VII inelastic
scattering dominates. This allows rather direct comparisons with benchmark
electron-ion scattering experiments.
