Electron resonance of gaseous diatomic hydrides II. Rotational constant, Λ-doubling, hyperfine structure and dipole moment of SeH and SeD

Abstract
The electron resonance spectra of the J = 3/2 and J = 5/2 rotational levels of the 2 II 3/2 state of SeH and the J = 3/2 rotational level of the 2 II 3/2 state of SeD are described. Values of the rotational constant and Λ-doubling parameters are determined. Evidence is found for a tensorial interaction of the spin and magnetic field, arising from the gauge invariance requirement of the spin-orbit coupling Hamiltonian. Hyperfine structure from 77 Se is observed, and the hyperfine coupling constants are determined. The effect of an electric field on the spectra is analysed and the electric dipole moment determined.

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