Abstract
Calculations of magnetic shielding constants of protons and heavy elements in HX 2 molecules (X=O, S, Se, and Te) are presented based on the Dirac–Fock (DF) method in the presence of a finite magnetic field. The calculated magnetic shielding constants agree fairly well with experiments. The so-called diamagnetic, paramagnetic, Fermi-contact, and spin–dipolar terms are also presented by applying the Gordon decomposition method. The results are compared with those calculated by the quasi-relativistic (QR) method, and we found that the difference between the DF and QR methods is significant for TeH 2.
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