Study of ion desorption induced by core-level excitations of condensed Si(CH 3) 4 by using photoelectron-photoion coincidence spectroscopy (PEPICO) combined with synchrotron radiation

Abstract

Photoelectron-photoion coincidence (PEPICO) spectra of condensed Si(CH 3) 4 were measured with C 1s and the Si 2p photoelectrons using synchrotron radiation. H + was found to be the only species desorbed in both cases. Furthermore, the H + yield in coincidence with the C 1s photoemission was found to be three times as large as that with the Si 2p photoemission. These results indicate that the Auger-stimulated ion desorption mechanism is responsible for the H + desorption, that the neutralization and recapture probabilities of the polyatomic ions are much larger than those of H +, and that the C 1s photoemission leads more efficiently to H + desorption than the Si 2p photoemission.