Abstract
Wave-lengths in the spectrum of a condensed discharge in heated bismuth vapour have been measured from λ 7050 A. to λ 2000 A. and those in the spectrum of a condensed spark between metallic terminals in hydrogen from λ 2000 A. to λ 1340 A. Hilger E
1
spectrographs, one with a glass and one with a quartz optical system, were used to study the first-mentioned spectral region and a Hilger vacuum fluorite instrument for the latter range. Light from a hot spark between metallic terminals
in vacuo
was photographed with a 1-metre vacuum grating spectrograph in order to investigate the spectrum below λ 1340 A. By a study of the frequencies of the wave-lengths thus obtained, considerable progress has been made in the identification of the multiplet term structure of bismuth II and of bismuth III. Confirmation of the correctness of assignment of wave-lengths to one or other of these spectra was obtained readily in most cases by varying the excitation of the sources of light by means of inductance in the secondary spark circuit.
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8 articles.
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