Abstract
THE problem of the relativistic Stark effect of hydrogen has been investigated mainly theoretically, the experimental investigation being hampered by great difficulties. These being less pronounced for the lines of ionized helium than for the hydrogen lines, I attacked the problem in question using the He+ line λ 4686 A. This needed a stigmatic spectral apparatus of high resolving power coupled with great brilliancy. A suitable large autocollimation glass spectrograph with two compound prisms was available, the total base-length of the flint prisms being 30 cm., and the focal length 150 cm. The dispersion in this region is about 2·5 A. per mm. As light source, I used a Lo Surdo tube as modified by Ryde.
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References
Roy. Soc. Proc., A, 119, 313 (1928). For further literature, see Kullenberg, B., Z. Phys., 102, 423 (1936).
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KULLENBERG, B. Relativistic Stark Effect of Ionised Helium. Nature 141, 244–245 (1938). https://doi.org/10.1038/141244b0
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DOI: https://doi.org/10.1038/141244b0
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