Magnetic Susceptibility of the Hydrogen Molecule

The effects of the nuclear motion on the magnetic susceptibility ${〈\xi 〉}_{0,1}$ of ${\mathrm{H}}_2$ in the $v=0\mathrm{}$, $J=1\mathrm{}$ vibrational-rotational level of its electronic ground state are investigated. The dependence of ${〈\xi 〉}_{0,1}$ on the orientation of the molecule in the applied magnetic field is also considered. The effects of the nuclear motion are found to be of the order of 2-4 parts in ${10}^2$.