DIRECT OBSERVATION OF CORRELATION BETWEEN ELECTRON-EMISSION AND FRAGMENTATION INTO IONS FOLLOWING B-1S EXCITATION OF THE BF3 MOLECULE

An alternative technique of coincidence between energy-selected electr ons and mass- and energy-selected photoions, combined with angle-resol ved photoion spectroscopy, has been applied to investigate the state-s elected dissociation dynamics of the B 1s core-excited BF3 molecule. D issociation from the spectator Auger final states both above and below the double-ionization threshold produces energetic B+ in the secondar y processes of stepwise dissociation after the molecular deformation ( D-3h-->C-3 nu, in marked contrast to dissociation following B 1s ioniz ation in which energetic F+ is ejected within the D-3h plane of the pa rent BF3 molecule.