Oscillator Strengths for High-level Transitions in Hydrogen

@article{Menzel1968OscillatorSF,
  title={Oscillator Strengths for High-level Transitions in Hydrogen},
  author={Donald Howard Menzel},
  journal={Nature},
  year={1968},
  volume={218},
  pages={756-757}
}
TRANSITIONS between high quantum levels of atomic hydrogen can produce spectral lines in the radio region. Observers have detected a number of such emissions from hydrogen gas in various radio sources. Theoretical interpretation of such observations requires knowledge of the oscillator strengths fn+c,n for transitions described by the quantum transition n+c→n. For n large and c small, the fs follow the asymptotic formula with Jc(c) is the Bessel function of equal order and argument and J′c(c… 
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