2s Hyperfine Structure in Hydrogen Atom and Helium-3 Ion
Abstract
The usefulness of study of hyperfine splitting in the hydrogen atom is limited on a level of 10 ppm by our knowledge of the proton structure. One way to go beyond 10 ppm is to study a specific difference of the hyperfine structure intervals 8 Delta nu2 - Delta nu1. Nuclear effects for are not important this difference and it is of use to study higher-order QED corrections.
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