Comparison of Measured and Calculated Stark Parameters for Singly Ionized Atoms

Abstract

Measured and calculated Stark-broadening parameters are compared for spectral lines emitted by singly ionized atoms from lithium through calcium. It is found that the average value of the ratio of the measured to calculated width is 1.06 ± 0.05, and the average value of the ratio of the difference between the measured and calculated shift to the measured width is +0.03 ± 0.07, where the average is over all compared lines. It is shown that only a small error is introduced by using the one-electron approximation (for equivalent electrons) or $\mathrm{LS}$ coupling. The greatest error arises from the incompleteness (and incorrectness) of tabulated energy levels and their classification.