Molecular-Beam Magnetic-Resonance Measurements of the Anisotropies of the Electric Polarizabilities of H2 and D2
The anisotropies γ=α∥-α⊥ of the static electric polarizabilities of H2 and D2 were measured in a molecular-beam magnetic-resonance experiment. The quadratic Stark shifts of the separated-oscillatory-field resonances in the ground electronic and vibrational and J=1 rotational states were measured in parallel electric and magnetic fields. The results are γ(H2)=0.3016+/-.0005 Å3 and γ(D2)=0.2917+/-.0004 Å3, which agree very closely with theory. A previously measured combination of the spin-rotation and quadrupole-interaction constants of D2 was independently remeasured, and the dependence upon orientation of the nuclear magnetic shielding of D2 was found to be σ+/-1-σ0=-11+/-9 ppm. An efficient electron-bombardment detector was constructed for this experiment.