Other
Scientific paper
Apr 1931
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1931natur.127..626r&link_type=abstract
Nature, Volume 127, Issue 3208, pp. 626-627 (1931).
Other
7
Scientific paper
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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