INNER-SHELL D-EXCITATION IN GAS-PHASE HEAVY-METAL HALIDES BY SYNCHROTRON-RADIATION PHOTOEMISSION AND AB-INITIO CI CALCULATIONS

Sn 4d electron excitations have been investigated in SnBr2 and SnCl2 f ree molecules experimentally and theoretically. The total ion yield (T IY) spectrum of tin dibromide in the Sn 4d excitation region (24 - 35 eV) is reported. The assignment of the experimental spectrum of SnBr2 is based on the excitation spectrum calculated at ab initio Configurat ion Interaction (CI) level, as well as on the comparison with experime ntal and theoretical data previously obtained for SnCl2. Photoion effi ciency (PIE) curves obtained in the same photon energy region show tha t some photofragment ion channels are preferentially involved in the d ecay of these resonances in both SnBr2 and SnCl2.