Nuclear motion corrections to some electric and magnetic properties of diatomic molecules

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Abstract
It is commonly assumed that the nuclei are at a fixed separation when relating the electric quadrupole moment of a diatomic molecule in a 1Σ state to the rotational g value and the magnetizability anisotropy. This assumption is examined with particular reference to the hydrogen isotopes and is found to lead to an error of approximately 1 per cent in the quadrupole moment. The paramagnetic magnetizability and rotational g value function for hydrogen are extracted from published expérimental data and combination of the latter with an accurate calculation of the quadrupole moment leads to precise values of the magnetizability anisotropy for the lower vibration-rotation states of hydrogen. An experimental measurement of the rotational g value for just one further state or isotope of hydrogen is required to make the analysis more accurate.