A detailed study of the NMR line shapes in solid H 2 has been carried out. The ortho-H 2 concentration c was between 0.09 and 0.95, and the temperature ranged from T=0.5 to 10°K. In the hep phase, a systematic compilation of the second and fourth moments as a function of c and T was made. In the cubic phase the splitting of the doublet structure was measured as a function of temperature. From an extrapolation of the measurements in the hep phase to the limiting case of pure ortho-H 2 , it is concluded that in the temperature region where thermal diffusion is unimportant, the second and fourth moments are independent of temperature, their values being, respectively, 80±2 kHz 2 and (14.8rfc0.8) X10 3 kHz 4 . The contribution to the second moment from intermolecular nuclear dipole interactions (this is the second moment extrapolated to T-oo) is obtained as a function of orthoconcentration and is compared with theoretical predictions. Good agreement is found if one takes into account the correlation between nearest H 2 neighbors, an effect that decreases the average value (R~3), where R is the distance between nearest neighbors. Experiments with 0.64
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