STARK-BROADENING ALONG THE BERYLLIUMLIKE SEQUENCE

We report on Stark width measurements of 2s3s-2s3p singlet and triplet transitions along the berylliumlike sequence performed in a gas-liner pinch discharge. Simultaneously with the spectroscopic measurements w e have diagnosed the plasma with Thomson scattering testing theoretica l scalings of the Stark broadening with density, temperature, and spec troscopic charge number Z. The comparison of measured Stark widths wit h semiclassical calculations shows that the calculated temperature sca ling is consistent with the experiment. However, a systematic discrepa ncy of measured Stark widths from theoretically predicted Z(-2) scalin g is found with increasing spectroscopic charge number Z.