Direct recombination and Auger deexcitation channels of La4d→4fresonant excitations in LaB6

Abstract

La $4d^{9}4f^1$ excited states (${}_{}{}^1{}_{}{}^{}P_1^{}{}_{}{}^{}$, ${}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}$, and ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$) created by resonant photoexcitations $h\nu +4\mathrm{}{d}^{10}\to 4d^{9}4f^1$ decay via direct recombination and Auger deexcitation channels as revealed from a photon energy dependence of photoemission spectra of La${\mathrm{B}}_6$. The Auger deexcitation channel is dominant for ${}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$ excited states below the $4d$ core-level threshold, while for the ${}_{}{}^1{}_{}{}^{}P_1^{}{}_{}{}^{}$ excited state above the threshold both channels are important to a comparable extent.