TEMPERATURE DEPENDENCE OF F CENTER ABSORPTION IN KBR AND NABR.
UNIVERSITY OF WESTERN ONTARIO LONDON DEPT OF CHEMISTRY
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The absorption due to F centers in X-irradiated KBr and NaBr was measured over a wide range of temperatures from 4 to 370K. In NaBr which is exceedingly difficult to colour there is also formed a well isolated M band without the usual difficulty of overlapping R bands and so the temperature-dependence of the shape of this M band could also be determined accurately. The difficulty of the overlapping K band was dealt with in two ways by Gaussian plots of the untreated data after background subtraction and by a computer resolution of the F and K bands. The latter calculations confirm the asymmetry of the K band. The half-widths of the F and M bands obey the usual formula for the variation of H with temperature and from the temperature-dependence of the half-widths, values of the effective ground state frequency were obtained. To what extent this represents a genuine local mode remains unresolved. There is some evidence for structure in the K band at low temperatures. Author
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics