Physics
Scientific paper
Sep 1928
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1928natur.122..312r&link_type=abstract
Nature, Volume 122, Issue 3070, pp. 312-313 (1928).
Physics
Scientific paper
RAMAN and Krishnan have recently described a new type of radiation emitted by organic liquids when illuminated with the light of a mercury arc, or with selected lines from such an arc. Lines are found in the spectrum of the scattered light at wave-lengths which are not present in the illuminating source. In the case of benzene the wave numbers of the shifted lines differ from those of the incident lines by amounts which are equal to the wave numbers of certain infra-red absorption maxima of the molecule. Raman and Krishnan state that these lines represent the scattered light of modified wave-length predicted by Kramers and Heisenberg in their correspondence principle treatment of dispersion. I believe this interpretation is correct. However, the evidence that these lines do not constitute a fluorescent emission, following the absorption process after a finite interval, is qualitative. First, Raman states that the radiation scattered with modified frequency from a cloud of carbon dioxide brightens up in the same way as the ordinary scattered light when the cloud is formed. Further, the shifted radiation is polarised nearly as strongly as that which suffers no change of frequency.
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