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Nature | Vol.142, Issue.3594 | | Pages 536-536
Band Spectrum of Helium
WHEN helium at a pressure of about 25 mm. of mercury is excited in such a way as to produce the line spectrum and the band spectrum in comparable intensity, McCallum and Wills1 find that the band spectrum persists much longer than the line spectrum after the excitation is removed. They show a spectrogram of the discharge, taken 1/600 sec. after the discharge had been interrupted, in which the line spectrum has disappeared while the band spectrum is still of approximately the same intensity as that from the discharge before interruption.
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Band Spectrum of Helium
WHEN helium at a pressure of about 25 mm. of mercury is excited in such a way as to produce the line spectrum and the band spectrum in comparable intensity, McCallum and Wills1 find that the band spectrum persists much longer than the line spectrum after the excitation is removed. They show a spectrogram of the discharge, taken 1/600 sec. after the discharge had been interrupted, in which the line spectrum has disappeared while the band spectrum is still of approximately the same intensity as that from the discharge before interruption.
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