SHIFTS OF ORTHO-H-2 NMR LINES RELATIVES TO HD IN SOLID H-2

We report measurements of the shifts of the ortho-H-2 NMR absorption lines relative to HD as a function of temperature (0.05 < T < 0.38 K) for an applied magnetic field of 6.3 T. At these fields the principal thermal polarization effect is the shift due to the I.J coupling between the nuclear spin I of the ortho-H-2 molecule and the orbital angular momentum J of the molecule if the latter is not quenched.