Abstract
IT has been known for many years that the radiations which an element emits in the state of a luminous gas are not invariable but depend on the presence of other elements, the manner in which the substance is excited to luminosity, and other circumstances. It was recognised in some of the earljest investigations that many band spectra were to be associated with compounds and that a spectrum might be due partly to such compounds and partly to uncombined atoms. Thus, for example, if strontium chloride is introduced into the flame of the bunsen burner we find lines associated with. the element, bands due to strontium oxide, and also bands due to the chloride, and when strontium bromide is substituted for the chloride the spectrum is the same as regards the lines due to the element and the oxide bands, but bands peculiar to the bromide are found to have replaced those due to the chloride.
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MERTON, T. Problems in the Variability of Spectra1. Nature 109, 519–520 (1922). https://doi.org/10.1038/109519a0
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DOI: https://doi.org/10.1038/109519a0