The photoionization of cadmium and mercury vapours

Abstract
A windowless vacuum ultra-violet monochromator was used for the study of the photoionization curves of cadmium and mercury. The energy range covered was from the onsets of ionization to 19 ev and 17.7 ev for cadmium and mercury, respectively. Several autoionization peaks were observed. These correspond to excitations of inner d electrons of the neutral atoms. Oscillator strengths are given for the autoionization peaks in cadmium.