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The infra-red spectrum of red amorphous selenium has been studied in the region of 1 /on to 25 fxm. The formation of Se8-ring molecules as well as polymeric chains Sen has been observed by investigating non-fundamental vibrations. Additional absorption bands at 7.85 ^m (1274 cm -1 ), 8.95/9.35 ^m (1117/1070 cm" 1 ) and 12.35 /um (810 cm-1 ) are reported. They are assigned to multiphonon processes of the type E fundamental of Sen at 74.1 «m (135 cm -1 ). Einleitung