Abstract
The new system of bands discussed in this paper was obtained by one of the authors (A. G. G.) in an experiment to observe whether nickel gave an oxide band system similar to that of iron, which appears when iron carbonyl is introduced into a flame. An analogous close-structured band system was obtained with nickel carbonyl, but in addition there appeared a band structure consisting of well marked series of widely spaced lines. Two heads were prominent at λ 5743, and λ 6281 two series of lines stretched towards the red end of the spectrum. The first six or seven lines were very strong. In the band of longer wave-length the lines showed a doubling increasing regularly towards the red. In addition there were a large number of faint lines, some of which have been arranged into branches. Experimental The source used for producing these bands was very simple. The vapour of nickel carbonyl Ni(CO)
4
was introduced into the air hole of a Meker burner. The vapour was carried through by a slow stream of coal gas which passed over a supply of the volatile liquid contained in a small bottle. For the satisfactory development of the hydride bands the adjustment of the flow of vapour was rather critical. Too great a flow intensified the oxide bands and produced a strong continuous background due to the incandescent particles of nickel formed during decomposition of the carbonyl.
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