Semiclassical calculations of electron impact Stark widths and shifts of singly ionized atom lines revisited

Highlights: • The improved semiclassical formalism in version of Griem and co-workers is reported. • Numerically improved calculations of Stark parameters at low electron plasma temperatures. • Calculations are also carried out for heavy ions, previously unreported by Griem and co-workers. - Abstract: The Stark broadening parameters for spectral lines of singly charged Mg II, Al II, Si II, Zn II, Sn II, Hg II, and Pb II ions, calculated in numerically improved semiclassical formalism of Griem are reported and compared with the original results of Griem for Mg, Al and Si ions and the semiclassical calculations in a version of Dimitrijević and Sahal-Bréchot for Mg ions. Detailed comparison with the experimental data is carried out, also.