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The nuclear magnetic resonance in bismuth metal powder has been observed from 9 to 19 Mc/sec at 4.2 °K. The isotropic and anisotropic Knight shifts and the quadrupole coupling constant have been determined as (-1.25±.30)%, (-0.3±0.3)%, and 2.10=1= .05 Mc/sec, respectively. The intrinsic linewidth was found to be 130±20 kc/sec. A technique is developed to take into consideration the broadening of the observed lines due to the combined effects of the magnetic dipolar broadening and the width due to the quadrupolar splitting of each line.

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143only slightly in structure from each other and having no polarization effects in the substitution. These results are consistent with the dependence of the octahedral cubic field splitting on small variations of lattice spac ing, as obtained from pressure data in MgO. 12 They also indicate that the variations of some of the param eters among different hosts are sufficiently large to ex plain discrepancies between the measured anisotropy constant in YIG and that obtained, assuming that the anisotropy originates in the crystalline field but using spin-Hamiltonian parameters obtained for YGaG. Such results should, hopefully, motivate theoretical calcula tions of crystal field splitting for the Fe 3+ ground state in order to elucidate the mechanisms responsible for their existence, thus permitting resonance results on such impurities to be used more efficiently in the study of their environment. ACKNOWLEDGMENTWe wish to thank Miss W. Doherty for her very able assistance with the diagonalization program for the spin-Hamiltonian matrices.The nuclear magnetic resonance spectrum of indium metal power has been measured at twelve magneticfield points in the range of 17.0 to 30.5 kG at 4.2°K. The analysis of this spectrum gives the isotropic Knight shift as +0.80±0.02%, the anisotropic Knight shift as -0.05±0.02%, and the nuclear quadrupole spliting parameter v q as 1.884±0.002 Mc/sec. All three of these quantities were determined at each of the twelve field points, and no field dependence has been observed in this range.

NMR of 9 Be in beryllium metal powder has been measured from 5 to 20 kG at 295 °K. The isotropic Knight shift is measured as (-O.0027±O.0006)%; the anisotropic Knight shift |