Spectroscopic Evidence of Arsenic Hydride

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MESSRS. Kimball and Bates1 have recently described some bands, emitted by a carbon arc, running in an atmosphere of hydrogen. The negative electrode was drilled and filled with arsenic. Because of this, the authors consider the bands to be due to AsH and As2. I find, however, strong arguments for the bands being identical with the CH bands λ3143 A., already investigated by Fortrat 2 and Hori.3 Even the conditions of activation, mentioned by Kimball and Bates, agree with my conclusions ; namely, that the bands were missing when the arsenic was placed in the positive carbon. This can be explained by the fact that the presence of a metal in the positive carbon strongly reduces the temperature of the arc, and the activation of the CH bands is very sensitive for the temperature.

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  1. 1

    NATURE, 128, 969, Dec. 5, 1931.

  2. 2

    C.R. Acad. Sc., 178, 1272; 1924.

  3. 3

    Z. Phys., 59, 91; 1930.

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RYDBERG, R. Spectroscopic Evidence of Arsenic Hydride. Nature 129, 167 (1932) doi:10.1038/129167a0

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