Abstract
To rationalize the recently found (Garbacz et al., 2012) [1] difference in magnetic shielding for H and D nuclei in HD, the contribution of excited Πg states has been considered in combination with a symmetry breaking term in Hamiltonian as perturbation (Moss and Sadler, 1987) [2]. The first order perturbed wavefunctions for the ground and four lowest excited 1Πg states were estimated. The resulted difference, σD−σH=0.009ppm, is close to the experimental value, 0.012ppm. In this approach, the effect is originated from nuclear mass dependence of matrix elements of the operator, describing the magnetic coupling of the ground and excited states.
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