Dissociative photoionisation of OCS from threshold to 40.8 eV

Energy-analysed photoelectrons have been measured in coincidence with produ ct ions from photoionisation of carbonyl sulphide at 21.21 and 40.8 eV phot on energy. Yields of the different products and kinetic energy release dist ributions in fragment ion formation are reported. Results on the states bel ow 20 eV agree with previous work, but our interpretation differs; new data are presented on inner valence states. In dissociation from states in the band at 23 eV there is forward/backward asymmetry in fragment ion direction relative to the electrons, indicating a fast dissociation and possibly ide ntifying the band as a 7 sigma satellite. (Int J Mass Spectrom 184 (1999) 6 7-74) (C) 1999 Elsevier Science B.V.