Physics
Scientific paper
Mar 1930
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1930natur.125..463k&link_type=abstract
Nature, Volume 125, Issue 3151, pp. 463-464 (1930).
Physics
2
Scientific paper
IN a recent communication (NATURE, NOV. 2, 1929) Prof. R. Bär of Zurich has shown that it is possible in many cases to photograph the Raman effect with solids in a state of powder. The difficulty encountered by him, and also by Dr. A. C. Menzies (see NATURE, Oct. 5, 1929), of the continuous background in the spectrum which overpowers all but the strongest Raman lines, is, however, serious, as it interferes with the general utility of the method. During the past two months I have been engaged in an attempt to overcome this difficulty, and have found that it may practically be avoided by running the mercury arc at a lower temperature, and, where necessary, also by interposing a suitable light filter between the arc and the illuminated substance. A concentrated solution of didymium chloride proved especially useful for this purpose. Thus, for example, all the four lines obtained by Schaefer with a large single crystal of sodium nitrate may, with equal success, be photographed in about half an hour by using an irregular aggregate of small crystals placed within a small triangular-shaped cell with mirrored walls.
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