Abstract
STUDYING the losses of energy suffered by slow electrons in mercury vapour by the methods of Lenard (velocity distribution) and Franck and Hertz, we came across a rather sensitive arrangement for detecting the inelastic collisions of smaller probability (V. I. Pavlov, Jour. Russ. Phys.-Chem. Soc., Phys. Sect., v. 58, p. 369, 1926). Applying this combined method to the investigation of the vapours of mercuric halides, we found for mercuric chloride at least four values for critical potentials: 1.6 v., 2.7 v., 3.9 v., and 6.6 v.; for mercuric bromide: 1.5 v., 2.9 v., 6.6 v., and 8.9 v.; for mercuric iodide: 1.4 v., 2.7 v., 6.2 v., and 7.8 v. The same method for iodine yielded the values: 1.2 v., 2.3 v., 3.8 v., 5.1 v., and 7.5 v. Some of these data seem to be in agreement with the observed absorption by the vapours of light of corresponding quanta.
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PAVLOV, V., LEIPUNSKY, A. Critical Potentials of the Vapours of Mercuric Halides. Nature 118, 843 (1926). https://doi.org/10.1038/118843a0
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DOI: https://doi.org/10.1038/118843a0
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