Calculation of the magnetic susceptibility of the ammonia molecule

Abstract
We performed an ab initio calculation of the diamagnetic susceptibility of the ammonia molecule by making use of gauge invariant atomic orbitals. The results are χzz = − 14.64 × 10−6 cgs units (along the molecular symmetry axis) and χxx = χyy = − 14.94 × 10−6. The total susceptibility is − 14.84, which differs by 9% from the most recent experimental value − 16.3 ± 0.8.