STUDIES OF COLOR CENTERS IN ALKALI HALIDES
Final rept. parts 1-3,
MARYLAND UNIV COLLEGE PARK INST FOR MOLECULAR PHYSICS
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High pressure effects on color centers in alkali halides The peak energy of the F band in the alkali halides studied is very sensitive to changes in the lattice spacing. High pressure measurements indicate that the Ivey equation is fortuitous in that the peak energy is not uniquely determined by the interionic distance of the bulk crystal, but also depends upon the host crystals. Half-widths of the F band above the transition point were greater than below the transition point and the peak optical density decreased. Pressure Effect on Color Centers in RbF, RbC1, RbBr, and CsI Absorption spectra of the F and M centers in RbF, RbC1, RbBr, and CsI were investigated as a function of pressure. In addition to the F and M band, the No. 3 bznd and some other unidentified bands were observed. Frequency shifts were observed under pressures up to 10,000 atm for the absorption spectra of RbC1 and RbBr and up to 50,000 atm for the absorption spectra of RbF and CsI. In RbF a phase transition appears at 33,000 atm.
- Inorganic Chemistry