Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions

Abstract

The triple differential cross section (TDCS) of the He 2+ (1s −2 ) and Ne 2+ (2s −2 ) states has been studied under unequal energy sharing conditions and perpendicular geometry, for a ratio of about 3 between the energies of the two ejected electrons. The dynamical quantities which govern the photodouble ionization (PDI) process, i.e. the squared moduli of the gerade and ungerade complex amplitudes and the cosine of their relative phase, have been extracted from the experimental data. The results from the two targets have been compared between themselves as well as with the theoretical predictions of the SC3 and convergent close coupling (CCC) calculations. This work represents a joint experimental and theoretical approach to the investigation of PDI of atomic systems with more than two electrons.

Resonant triple-differential cross-section measurements on atomic strontium

“…A thorough review of the theoretical and experimental work on He has been presented by Briggs and Schmidt [2]. Experimental work also included the heavier noble gasses of argon [3] and neon [4,5], where resonances and multiple electrons in the final ionic state add to the complexity. Some of the earliest theoretical work focused on these noble gases in which Huetz and co-workers [6] used the Wannier theory to develop a TDCS expression.…”