Molecular beam magnetic resonance study of intra- and inter- molecular effects in H2in high rotational states

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Abstract
The hyperfine spectrum of H2 in the (J = 3) and (J = 5) rotational states has been observed in the low-field limit by the molecular beam magnetic resonance method. The spin-rotation constant cJ and the spin-spin constant dJ have been determined for each state. The results in kHz are It is shown that these values are consistent with the earlier measurements of Ramsey and collaborators on H2, HD and D2 in lower rotational states and the current theory for centrifugal distortion and isotope effects. From the intensities of the two (J = 3) lines, the two (J = 5) lines and one (J = 1) line, it is shown that the distribution over rotational states in a nozzle source under the conditions used here is strongly athermal.