INVESTIGATION OF LS COUPLING IN BORON-LIKE IONS

In order to test the validity of the LS-coupling approximation for lig ht elements, the line-intensity ratios of the 3s-3p and 3p-3d multiple ts in C II through F V and C II through Ne VI, respectively, have been investigated experimentally with emission sources. Also, calculations with multiconfiguration Dirac-Fock wave functions have been performed . Within the errors of the experimental procedure, no significant viol ations of the LS-coupling approximation were found for the lines of th e 3s-3p and 3p-3d multiplets in C II through F V. However, in the case of Ne VI, small deviations of measured intensities from those obtaine d by applying the LS-coupling approximation were observed.