Abstract
I HAVE been investigating the Raman effect in a number of crystals, using the same method of excitation which proved to be particularly successful with gases.1 The primary source consists of a powerful water-cooled mercury arc, which gives an extremely intense and sharp resonance line λ2537. The advantages of this method are: (1) the ratio of the intensity of the line λ2537 to the other mercury lines in the ultra-violet is so large that in a spectrogram of moderate exposure all the Raman lines are excited by the former radiation ; (2) a short exposure is required (10 minutes to three hours) ; (3) a wide range of frequency shifts is available (about 20,000 cm.–1) ; (4) the exciting radiation can be easily absorbed by a filter of mercury vapour between the substance and the photographic plate, thus allowing the observation of modified frequencies in the immediate neighbourhood of the primary line.
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References
Phys. Rev. 34, 367; 1929. Zeits. f. Phys., 61, 598; 1930. ibid., 66, 646; 1930.
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RASETTI, F. Raman Spectra of Crystals. Nature 127, 626–627 (1931). https://doi.org/10.1038/127626a0
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DOI: https://doi.org/10.1038/127626a0
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