L1−L2,3M4,5Coster-Kronig transition thresholds in the region37≤Z≤56

Abstract

The $L_1-L_2{M}_{4,5}$ and $L_1-L_3{M}_{4,5}$ Coster-Kronig transition thresholds in the atomic-number region $37\le Z\le 56$ are determined by bombardment of these elements with 2.5-MeV ${\mathrm{H}}^{+}$ ions, and detection of the resulting $L$ x rays with a curved-crystal spectrometer. The intensities of both the $L\alpha$ and $L{\beta }_1$ satellites, along with the total intensities of the $L\alpha$, $L{\beta }_1$, and $L{\beta }_{3,4}$ x rays which are produced during these collisions, are dependent upon the energetic permissibility of these Coster-Kronig transitions. The discontinuous nature of the intensity ratios as functions of atomic number indicates that the $L_1-L_2{M}_{4,5}$ and $L_1-L_3{M}_{4,5}$ transitions are energetically allowed for the elements with atomic numbers in the regions $Z\le 39 or 40$ and $Z\le 49 or 50$, respectively.