Inelastic light scattering of the VK- and H-centre in alkali halides

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Abstract
The inelastic light scattering of the VK-centre was measured in LiF, KCl and RbCl. The spectra consist of a single peak at 437 cm-1 of the laser frequency in LiF, at 241 cm-1 in KCl and at 244 cm-1 in RbCl [1]. The raman active fundamental mode of the X-2 molecule (X- : halogen ion) induces the inelastic light scattering, as is seen by comparison with calculated data on the free X-2 molecules [2] as well as with measured frequencies of analogous systems. A tentative calculation of the frequency of the VK mode in the series of the alkali chlorides and fluorides, based on a semi-empirical theory of the defects configurational energy, is perfomed and compared with our experimental results. The H-centre was produced in OH- doped KCl crystals by UV-excitation, and a raman line at 266 cm-1 is correlated with this process. The experiment was complicated by a fast bleaching of this raman signal by the laser light

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