Abstract
The variation of Lambda doubling with rotational quantum number is investigated for BeH and BeD. Hartree-Fock wavefunctions are used to calculate accurate matrix elements of the Coriolis operator from which the Lambda doubling constants are deduced. For BeH an experimental maximum in the Lambda doubling is confirmed whereas no maxima are predicted in the case of BeD. These facts are simply rationalized in terms of the likely potential curves. It is concluded that a second order perturbation treatment, invoking the concepts of 'pure precession' and the Born-Oppenheimer approximation works very well for these molecules.
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