Dissociative photoionization of carbon disulphide and carbonyl sulphide

High resolution photoionization mass spectrometry shows that S+ from CS2 and COS, and CS+ from CS2 appear at the thermochemical dissociation limits with no kinetic or internal energy release to the fragments, accompanied by zero energy electrons. S2+ is formed from CS2 by a bimolecular reaction of CS2+(?) of very high cross section, as well as by unimolecular fragmentation. Five new Rydberg series of COS leading to the ? and ? states are identified, and empirical observations on resonance peak shapes which differ in different channels are presented.