SPECTATOR AUGER TRANSITIONS OF THE 1S HOLE STATES IN IONIC SULFUR-COMPOUNDS AND MOLECULAR CHLORINE COMPOUNDS

The Auger transitions after resonant S1s --> 3p (3p* indicates unoccu pied states with 3p character) and Cl1s --> 3p excitations were studi ed for sulfur compounds (MoS2, Li2SO4 and Na2S2O3) and chlorine compou nds (Si(CH3)3Cl and SiCl4 solidified on Cu(100) surface) by photoemiss ion spectroscopy using synchrotron radiation. In the photon energy of the resonant excitations, the KL2,3L2,3 spectator Auger line was found to shift in two steps to higher electron energy by 2 - 10 eV in propo rtion to the exciting photon energy. Furthermore conspicuous splitting of the Auger line into a two-peak structure was found for Li2SO4, Na2 S2O3 and multilayered chlorine compounds. The phenomena observed for t hese insulators indicate that both screening effect in the decay proce ss and broad bandlike structures of the unoccupied states play importa nt roles in the Auger resonant Raman scattering of the incident photon s.