Physics
Scientific paper
Jun 1930
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1930natur.125..856e&link_type=abstract
Nature, Volume 125, Issue 3162, pp. 856 (1930).
Physics
1
Scientific paper
SOME years ago one of us (Terenin: Zeits.f. Physik, 31, p. 40; 1925) observed a strong re-emission of the aluminium line at 1854 A. in the fluorescent spectrum of dense mercury vapour excited by an aluminium spark. A great deal of work has been done since on mercury band fluorescence, but this re-emission has not been recorded again. This can be explained by the strong absorption of the radiation in ordinary spectrographs with thick quartz and a long light-path in air ; a very small home-made fluorite spectrograph was used in the experiment mentioned. Last year this subject was re-examined by us in more detail. The part played by absorption was shown clearly by the fact that an exposure of five hours was needed to record the emission with an ordinary small quartz spectrograph, whereas five minutes sufficed with the fluorite one. In spite of the short focal length of the lenses (5 cm.) the dispersion of the fluorite prism was sufficient to show the aluminium lines at 1854 A. and 1862 A. clearly resolved.
Eliashevich M.
Terenin A.
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