Abstract
THE absorption curves of crystals of sodium and A potassium chloride coloured by X-rays obtained by Molnar1 have shown a rise in absorption towards the ultra-violet edge (2,300 A.) of his spectral range. We have made measurements of this V-band2 extending down to 2,000 A. which have established that it is an essential feature of all photochemically coloured alkali halide crystals wholly complementary to the V-band in the visible spectrum. The V-band in the chlorides follows very closely the theoretical absorption curve of a single classical oscillator (Fig. 1). In potassium bromide it has two components, the relative intensity of which depends on the intensity of coloration (Fig. 2).
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References
Molnar, J. P., Ph.D. Thesis, Mass. Inst. Tech., 1940.
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Mott, N. F., and Gurney, R. W., “Electronic Processes in Ionic Crystals", 115.
Mollwo, E., Ann. Phys., 29, 394 (1937).
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ALEXANDER, J., SCHNEIDER, E. Electron Defect Centres in Alkali Halides. Nature 164, 653–654 (1949). https://doi.org/10.1038/164653b0
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DOI: https://doi.org/10.1038/164653b0
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