Abstract

Relativistic and non-relativistic Hartree-Fock calculations have been carried out for the series CH 4 to PbH 4 within the spherically symmetric one-centre expansion approximation. Inaccuracies are found in earlier work by Mackrodt using the same model. The calculated bond lengths agree with experiment within a few per cent. Relativistic effects diminish the bond length by about 0.6, 2.3 and 5.6% for GeH 4, SnH 4 and PbH 4, respectively. The calculated force constants and orbital energies are in reasonable agreement with experiment. The spin—orbit splitting of the filled valence p shell is 0.16, 0.42 and 1.54 eV for GeH 4, SnH 4 and PbH 4, respectively.

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