Abstract
RAO1 has recently observed the absorption spectra obtained when halides of mercury were placed in a heated steel tube. New systems attributed to HgCl and HgBr were found and analysed, leading to values for the dissociation energies of these molecules. Comparison of the wave-lengths of these 'new' bands with tables2 of collected band heads of known molecules reveals coincidences with CuCl and CuBr. More detailed comparison shows that Rao's Q1 heads of 'HgCl' coincide with the D system of CuCl, and the Q2 heads with the E system. For 'HgBr' all the assigned band heads can be identified with the B system of CuBr; other unassigned bands of 'HgBr' coincide with bands of the A system of CuBr. The identity is quite convincing.
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References
Rao, A. L. S., Indian J. Phys., 16, 393 (1942).
Pearse, R. W. B., and Gaydon, A. G., "The Identification of Molecular Spectra" (Chapman and Hall., London, 1941).
Gaydon, A. G., Proc. Roy. Soc., A, 182, 199 (1913).
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GAYDON, A. Absorption Spectra of Mercury Halides. Nature 155, 452 (1945). https://doi.org/10.1038/155452b0
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DOI: https://doi.org/10.1038/155452b0
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