Abstract
The Raman spectra of glasses with compositions in the range As 35S 65 yo As 43S 57 have been recorded using near band-gap excitation ( λ i = 5145 A ̊ ) and also weakly absorbed excitation ( λ i = 6328 A ̊ ). With 5145 Å excitation there is a significant enhancement at ∼231 cm −1 for the glasses with ⩾ 40 at. % As. This band is attributed to the presence of As-As bonds in the AsS network. Both As-As and S-S bonds are believed to occur in the stoichiometric glass, a-As 40S 60, though in small numbers. The enhancement of the 231 cm −1 band for 5145 Å excitation is shown to be primarily a resonance effect, suggesting that As-As bonds constitute electronic “defect” states within the mobility gap.
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