Resonant photofragmentation of methanol at the carbon and oxygen K-edge byhigh-resolution ion-yield spectroscopy

Resonant photofragmentation of core-excited methanol has been studied with high-resolution partial ion-yield spectroscopy near both the carbon and oxy gen K-edge. Non-coincident and coincident fragmentation channels were monit ored simultaneously. A steep increase in the coincidence yield curves above the ionization threshold, where the normal Auger decay produces doubly cha rged or multiply charged species which yield two or more charged fragments, has been observed. A relevant difference in resonant structure has been ob served while comparing the fragmentation at the carbon K-edge and the oxyge n K-edge. Evidence for inter-atomic Auger decay is presented for one partic ular single channel around the oxygen K-edge.