DISSOCIATION DYNAMICS OF B 1S CORE-EXCITED BF3 PROBED BY ENERGY-SELECTED ELECTRON ENERGY-SELECTED ION COINCIDENCE AND ANGLE-RESOLVED ION SPECTROSCOPY

A coincidence study between energy-selected electrons and mass- and en ergy-selected ions shows that dissociation from the spectator-Auger-fi nal states both above and below the double ionization threshold produc es energetic B+ whereas dissociation following B 1s ionization produce s energetic F+. An angle-resolved photoion study reveals that the B+ i s ejected from the spectator-Auger-final states of the deformed C-3 up silon pyramidal molecule, alter the neutral F ejection but before the free molecular rotations, whereas the B+ ejection following the B is i onization is within the D-3h plane of the parent molecule.