J. Electron Spectrosc. (1999)
Photofragmentation of OCS at the S 1s edge
John J. Neville, Tolek Tyliszczak and Adam P. Hitchcock
Department of Chemistry, McMaster University, Hamilton, ON, Canada L8S 4M1
Abstract. The photofragmentation of carbonyl sulphide following sulphur Is excitation has been investigated using monochromated synchrotron radiation and ion time-of-flight mass spectroscopy. Photoion branching ratios indicate that fragmentation to atomic ions increases at the onset of S 1s excitation and that the yield of multiply charged ions increases at the onset of S 1s excitation and again at the S 1s ionization threshold. Cleavage of the carbon-sulphur bond is favoured over cleavage of the oxygen-carbon bond both above and below the sulphur ls ionization threshold. The multi-coincident detection of up to three photoions per ionization event is used to identify the fragmentation channels following S 1s® p * excitation and explore the fragmentation dynamics.