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

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 c_J and the spin-spin constant d_J 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.