The Balmer Absorption Series of Hydrogen

Physics

Scientific paper

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Scientific paper

Laboratory method of obtaining ten Balmer lines in absorption.-Condensed discharges were passed through an under water spark in series with a tube, 75 cm in length, of moist hydrogen at a pressure of 0.5 mm of mercury. The light from the spark traversed the glowing hydrogen, and the Balmer lines appeared as narrow dark absorption lines against the continuous spectrum of the spark, the absorption series extending to the tenth Balmer line. By adjusting the relative intensities of the light of the spark and of the glowing hydrogen, spectra were obtained with Hα and Hβ either bright or dark while the higher members of the series remained always dark. Spectra were produced showing Hβ and Hγ dark but with a bright central core. These phenomena are well known in stellar spectra, to which reference is made.

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