Si:2p core-level photoexcitation and photoionization of organosilicon molecules

By means of synchrotron radiation and ab initio calculations, we have investigated Si:2p core-level photoexcitation and photoionization of organosilicon molecules that are interesting from the viewpoint of site-specific excitation and fragmentation. The site-specific excitation and fragmentation are not clearly observed in molecules in which two Si atoms are placed in a similar chemical environment surrounding them or situated relatively closely to each other. From the calculated results, it is suggested that, in molecules containing an Si-Si bond, there is a low-lying state in which the electron distribution is localized around the Si-Si bond.