The Stark effect of the $N=1$ rotational level in the metastable c³Πᵤ electronic state of orthohydrogen has been measured using the molecular-beam magnetic-resonance method. The Stark-shift coefficients of orthohydrogen, unlike those of parahydrogen, are strongly dependent on static magnetic field strength. The measured magnetic field dependence of these coefficients agrees with a calculation in which we assume that the major contribution to this phenomenon is the mixing of hyperfine levels by the Zeeman-effect perturbation. The extrapolated zero-magnetic-field values of the Stark-shift coefficients are in reasonable agreement with the corresponding theoretical values. The Stark effect of the $N=2$ rotational level of parahydrogen has been remeasured with considerable reduction in the experimental uncertainties. This allows a more meaningful comparison with theory. At large magnetic field strengths (100-150 G) the Stark effect of para-H₂ exhibits a small dependence on magnetic field which is due to mixing of the fine-structure levels by the Zeeman-effect perturbation.
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Kagann et al. (1976) studied this question.
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