Experimental study measures magnetic fine-structure intervals in high-lying helium states, indicating that the two-electron wave function behaves hydrogenically.
The magnetic fine-structure intervals separating the four members of the 10G and 10H manifolds of helium have been measured with a precision of 0.1% using a fast-beam microwave-optical resonance technique. The results are found to be in good agreement with theory, illustrating that the two-electron wave function is very nearly hydrogenic. The measurements are also used to determine the small exchange energies of the 10G and 10H states.
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Hessels et al. (1987) studied this question.
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