Band Spectrum of Helium


IN the course of some investigations on the electrical properties of helium at fairly high pressures (about 25 mm. mercury), it was found that, if the gas was excited in such a way as to produce the line spectrum and the band spectrum of helium in comparable intensity, the rate of decrease in intensity of the band spectrum was much smaller than that of the line spectrum after the excitation was removed.

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MCCALLUM, S., WILLS, M. Band Spectrum of Helium. Nature 142, 252–253 (1938).

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