The high-energy satellites of L$\alpha _{2}$ X-Ray transition in higher-Z atoms

The X-ray satellite spectra arising due to 2p$_{3/2}^{-1}$3x$^{-1}$-3x$^{-1}$3d$^{-1}$ (x$\equiv $s,p,d) transition array, in elements with Z=73 to 90, have been calculated. The energies of various transitions of the array have been determined by using available Hartree-Fock-Slater data on 1s$^{-1}$-2p$^{-1}$3x$^{-1}$ and 2p$_{3/2}^{-1}$-3x$^{-1}$,3x'$^{-1}$ Auger transition energies and their relative intensities have been estimated by considering cross - sections of singly ionized 2x$^{-1}$ (x $\equiv $ s, p) states and then of subsequent Coster-Kronig and shake off processes. The calculated spectra have been compared with the measured satellite energies in L$\alpha _{2}$ spectra. It has been established that one satellite observed in the L$\alpha _{2}$ region of the X-ray spectra of various elements and named $\alpha _{s }$in order of increasing energy are mainly emitted by 2p$_{3/2}^{-1}$3d$^{-1}$-3d$^{-2}$ transitions. It is observed that the satellite $\alpha _{s}$ in all these spectra can be assigned to the superposition of three intense transitions namely $^{3}$P$_{1}-^{3}$D$_{1}$, $^{3}$D$_{2}-^{3}$D$_{3}$ and $^{3}$D$_{2}-^{3}$D$_{1}$. The three remaining satellites in $_{80}$Hg namely La$_{13}$, La$_{14}$ and La$_{17}$ are found to have different origin in different elements.