Physics
Scientific paper
Feb 1933
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1933natur.131..204k&link_type=abstract
Nature, Volume 131, Issue 3302, pp. 204-205 (1933).
Physics
Scientific paper
IN an important paper1 Wawilow has reported measurements on the polarisation of fluorescence of solutions of some dye-stuffs in glycerine, when excited by radiations of different wave-lengths. Using for excitation the radiations from a mercury lamp, isolated by a quartz monochromator, he finds that the degree of polarisation shows a marked dependence on the wave-length of the exciting light. Starting from the visible region of the spectrum, as the wavelength of the exciting light is diminished the degree of polarisation decreases rapidly, passes through a minimum value (corresponding, in genera], to excitation by λ 3125-3131), and rises again as we proceed farther towards the ultra-violet. The minimum value is usually negative; that is, the intensity of the fluorescent vibrations along the direction of propagation of the incident light is greater than that of vibrations in the perpendicular direction.
Krishnan K. S.
Mitra S. M.
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