Bands in the Spectrum of Boron Hydride

Abstract

WITH the object of obtaining band spectra due to compounds of boron, we have investigated the radiation emitted by a condensed discharge in a tube through which a stream of BCl3 was passed. Besides the atomic lines of boron, chlorine, aluminium (from the electrodes), and hydrogen (perhaps due to HCl present in the BCl3), we found a number of widely spaced bands in the neighbourhood of 4000 A., which we ascribe to the molecule BH. Photographs taken in the first order of a 21 ft. concave grating showed that these bands consist of single P-, Q-, and R- branches, the Q-branch containing a considerable number of lines, and the lines P(0), P(1) being missing. The bands must hence be considered as a 1II→ 1∑ transition, probably corresponding to the 1II→1∑ transition observed for A1H by Eriksson and Hulthén.1 The P- and R-lines of the strongest band are accompanied for higher rotational quantum numbers by weak satellites due to the isotopic molecule B10H. The frequencies of the principal lines, emitted by the molecule B11H, may be represented with good approximation by writing for the rotationa terms of the 1II-state

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References

  1. 1

    Zeit. f. Phys., 34, 775; 1925.

  2. 2

    See Kronig, Zeit. f. Phys., 50, 347; 1928. Hill and Van Vleck, Phys. Rev., 32, 250; 1928.

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LOCHTE-HOLTGREVEN, W., VAN DER VLEUGEL, E. Bands in the Spectrum of Boron Hydride. Nature 127, 235–236 (1931). https://doi.org/10.1038/127235b0

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