Abstract
HITHERTO no band spectra have been found which involve electronic excitation in neutral or ionised hydrogen chloride. We have recently photographed an extended band system in the region λ2830–λ3966 from a low pressure discharge in pure hydrogen chloride gas with platinum electrodes. The bands are degraded toward long wave-lengths, and have the characteristic widely spaced structure always observed in hydride spectra. A discharge in hydrogen gives the same band system if a small amount of silver chloride or cuprous chloride is fused on the electrodes, but not if silver bromide is used. Thus there is strong evidence that this spectrum is due to the hydrogen chloride molecule. Moreover, there are reasons, both experimental and theoretical, for believing that the emitter is singly charged, probably the HCl+ ion. For example, the bands are obtained only from the negative glow, whereas in general the spectra of ionised molecules, such as N+2, are relatively stronger.
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BRICE, B., JENKINS, F. A New Ultra-violet Band Spectrum of Hydrogen Chloride. Nature 123, 944 (1929). https://doi.org/10.1038/123944b0
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DOI: https://doi.org/10.1038/123944b0
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