CARBON AND OXYGEN KLL AND SULFUR LMM AUGER-SPECTRA OF OCS

Auger spectra of carbon 1s, oxygen 1s and sul fur 2p core-ionized carbonyl sulfide (OCS) are presented and discussed. In each case the Auger decay involves valence electrons, with de-excitation to final states of +2 charge. Because OCS contains three different atoms and the Auger spectrum of each can be measured it is possible to make a number of level assignments for the final states of the +2 ion. These assignments are based on comparisons of the three spectra with each other and with semi-empirical calculations. An three spectra show significant localization effects. The sulfur spectrum exhibits very narrow peaks and allows unambiguous determination of the energies for the ground and first two excited states that derive from the 3π2 configuration. The energies and splittings of these and other states are compared with other experimental and theoretical findings. © 1990.