Abstract
WE have photographed the absorption spectrum of bismuth and also the spectrum of the thermionic discharge at potentials ranging between 4 and 60 volts. Several stages in the excitation of the arc spectrum, and at least two classes of spark lines, have been recognised; 64 arc lines have been classified. The spectrum of the neutral atom is characterised by wide doublets, and most of the energy-levels so far identified are of p-type.
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RUARK, A., MOHLER, F., FOOTE, P. et al. The Spectra of Fifth Group Metals. Nature 112, 831 (1923). https://doi.org/10.1038/112831b0
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DOI: https://doi.org/10.1038/112831b0
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