Variation in Relative Intensity of Helium Lines

Details Variation in Relative Intensity of Helium Lines Variation in Relative Intensity of Helium Lines

Aug 1909

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1909natur..81q.189n&link_type=abstract

Nature, Volume 81, Issue 2076, pp. 189 (1909).

Physics

Scientific paper

IT has long been an open question whether the spectra of gases were subject to any general law of intensity variation such as the Wien-Paschen displacement law for incandescent solids. Reasoning from Kirchhoff's law, it is frequently assumed that the Wien-Paschen function must be an envelope to the radiation spectrum of any gas, at least for certain selected lines. Pflüger's work with the mercury lamp (Ann. Ph., July, 1908) indicated some such variation in relative intensity, but the energy (temperature) effect was obscured by the effect of varying vapour density. The latter is known to be large, so that the existence of the former was not proven.

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