Auger decay of the 2p vacancy in chlorine

Abstract

We calculate the spectra of electrons emitted upon Auger decay of the $2p$ vacancy in chlorine. The vacant atomic and ionic states are populated by a single-photon absorption from the ground state of the chlorine atom and are tested by comparing the calculated photoabsorption spectrum with the existing theoretical and experimental photoionization data. The agreement is reasonably good, although the calculated Auger decay rates and oscillator strengths of the low-lying states are overestimated due to neglect of the core polarization effects. In the absence of any published experimental result, the nonresonant $L\ensuremath{-}{M}_{23}^{2}$ Auger spectrum of Cl at 220 eV photon energy is compared with the Cl $L\ensuremath{-}{V}^{2}$ Auger spectrum of HCl, measured at 235 eV photon energy. The calculated spectator and participator resonant Auger spectra of some strongly photoexcited Cl $2{p}^{\ensuremath{-}1}$ states are presented for future reference.