Summary
Twelve spectrophotometer records of the absorption by NaF plates are reproduced covering the wavelength range between 7µ and 23µ for absorption paths ranging from 21 mm. down to 0·18 mm. The octave of the fundamental mode of highest frequency records itself as a sharply-defined absorption at 18·2µ. This gives 275 cm.−1 as the fundamental frequency, in fair agreement with the theoretically computed value of 281 cm.−1 It also fits in with the observed infra-red reflexion maximum at 36µ.
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Reference
Raman, C. V... “The Specific Heats of the Alkali Halides and Their Spectrcscopic Behaviour,”Memoir No. 131of the Raman Research Institute andProc. Ind. Acad. Sci., 1962,56 A, 1–69.
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Memoir No. 132of the Raman Research Institute, Bangalore-6
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Raman, C.V. The infra-red behaviour of sodium fluoride. Proc. Indian Acad. Sci. 56, 223–232 (1962). https://doi.org/10.1007/BF03046295
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DOI: https://doi.org/10.1007/BF03046295