ENERGY-DEPENDENCE OF LIGHT-INDUCED CHANGES IN g-As45S55 DURING RECORDING THE MICRO-RAMAN SPECTRA

Abstract

Light-induced structural changes of g-As45S55 were probed both by macro FT-Raman and energy-dependent micro-Raman spectroscopy. We suppose that new observed features in the Raman spectra of As-rich As-S glass are related to transformations of As4S4 molecules. Being initially in the structure of g-As45S55 closed and connected with glassy network only by weak Van der Vaals forces a(b)-As4S4 molecules are transformed into pararealgar p-As4S4 form during laser illumination. The effectiveness of transformations depends mainly from photon energies used for irradiation but transformation tendency observed for all used photon energies ranged from 1.65 to 2.54 eV. Observed Raman features and their structural origin are discussed.