Abstract

Molecular hyperfine structure hamiltonians are averaged over asymmetric-rotor eigenstates J T using the proportionality between tensor operators of the same rank. Final matrix element expressions are easily obtained from the resulting effective hamiltonians, in any desired coupling scheme. The evaluation of off-diagonal matrix elements is also discussed. The procedures employed utilize irreducible-tensor techniques but avoid inconvenient changes between cartesian and spherical representation of the interaction-tensor products. The results agree with earlier derivations.

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