Abstract
IN connection with some letters recently published in NATURE (vol. lxxii. pp. 557, 630), the following note may perhaps have some interest. Researches on the above named subject have been made in the physical institute of the University of Erlangen. Dr. Pauer (Wied. Ann., lxi., p. 363, 1897) has determined for a great number of substances the position of the absorption bands, and Dr. Müller (Erlangen Inaugural Dissertation, 1903, Sitzungs berichte der physikalisch-medicinischen Societät in Erlangen, vol. xxxiv., p. 188, 1902) has tried to get some values of the absorption coefficients of vapours. By the researches of Friedrichs and Grebe, the results of Pauer have been in many respects amplified. Perhaps I may direct attention to the fact that Dr. Pauer found that the law of Kundt on the displacement of the absorption bands towards the red with increasing refraction index or dispersionis true when passing from the vapour to the liquid and then to the solutions in different media. His observations were made on benzol, toluol, the isomers of xylol and æthylbenzol, chlorobenzol, bromobenzol, iodobenzol, anilin, nitrobenzol, pyridine, bisulphide of carbon. Benzol and bisulphide of carbon were especially carefully treated by him.
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WIEDEMANN, E. Absorption Spectra of Ultra-violet Rays by Vapour and Liquids. Nature 73, 101 (1905). https://doi.org/10.1038/073101b0
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DOI: https://doi.org/10.1038/073101b0
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