L-shell X-ray energy shifts for an additional vacancy in the M shell

A relativistic screened hydrogenic model is used to calculate the transition energy shifts of Ll, L eta, Lβ15 and Lγ1 x-ray lines for a spectator vacancy in the Msub(v) subshell for ZETA 57 and ZETA = 60-95 in steps of 5. It is pointed out that, although not very pronounced, the relativistic effect is quite interesting for the L x-ray spectra. Relativity is seen to play an opposite role in affecting the energy shifts for LM and LN transitions. A possible explantation of this is presented in terms of the concept of direct and indirect relativistic effects on atomic orbitals. The present values for 57La are found to agree quite well with the experimental results of previous workers; also the results indicate that quantum electrodynamic corrections are important in calculating L x-ray transition energy shifts. (author)