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MULTIPHONON PROCESSES IN AMORPHOUS SELENIUM.
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED PHYSICS
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The fundamental vibration modes of amorphous selenium have recently been identified assuming a structural model involving the presence of Se8 molecules as well as polymeric Se chains. In the present work the temperature dependence of the i.r. spectrum of amorphous selenium has been measured and used to assign the non-fundamental absorption bands. The temperature dependence of the absorption edge has been discussed previously. In the wavelength range between the absorption edge and the highest frequency fundamental vibration i.e. between 1 and 39 micro m several absorption bands have beem reported in the literature but disproved by later publications. However, none of the absorption bands discussed in this paper are due to impurities or different preparation techniques of the specimens. Author
APPROVED FOR PUBLIC RELEASE