Accession Number : AD0669494

Title :   TEMPERATURE DEPENDENCE OF F CENTER ABSORPTION IN KBR AND NABR.

Descriptive Note : Technical rept.,

Corporate Author : UNIVERSITY OF WESTERN ONTARIO LONDON DEPT OF CHEMISTRY

Personal Author(s) : Jacobs,Patrick W. M. ; Menon,A. Krishna

Report Date : 20 MAY 1968

Pagination or Media Count : 35

Abstract : 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)

Descriptors :   (*BROMIDES, COLOR CENTERS), (*COLOR CENTERS, ABSORPTION SPECTRA), POTASSIUM COMPOUNDS, SODIUM COMPOUNDS, DAMAGE, RADIATION EFFECTS, THERMAL PROPERTIES, BAND SPECTRA, GROUND STATE, ELECTRONS, PHONONS, INTERACTIONS, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE