Auger spectroscopy on heavy-ion-atom collisions. II. Na+, Mg+, Al+, P+, S+, Cl+-Ar collisions

Abstract

For pt.I see ibid., vol.9, no.9, p.1567 (1976). Z1+-Ar collisions, Z1=11-17 (except 14) are studied at impact energies of 10-100 keV by spectroscopy of L2,3-MM electrons from projectile Z1. Lines are resolved and identified using calculated energies and, in a few cases, photoabsorption data. Coster-Kronig structure, particularly pronounced for Z1=11, reveals formation of L1 vacancies. For Z1=15-17, low-energy lines in the L2,3 Auger group are due to the second transition in the Auger decay of double-vacancy states. Discussion of relative intensities based on previous charge-state and inner-shell excitation data indicates that: (i) in the initial double-vacancy state (after autoionization), the outer shell is in its ground state if the number of outer electrons is equal to or lower than the number of outer electrons on the incident ion; and (ii) with more outer electrons, a 3s vacancy is likely to be present. For the most probable double-vacancy states, the number of outer electrons is one higher than the number of electrons in the M shell of the incident ion.