The effect of small quadrupole interactions on single-passage nuclear magnetic resonance of oriented nuclei is reported both in theory and experiment. In contrast to the purely magnetic (Zeeman) case, the quadrupole interaction P gives rise to a sweep-direction dependence of the resonance signal. This yields the sign of P and subsequent time development gives the nuclear-spin-lattice relaxation time. The magnitude of P can be obtained from the signal during passage even in the presence of inhomogeneous broadening I )&2IP. The technique is applied to ' 'Au nuclei in cubic ferromagnetic Fe and P = 0.21~0.02 MHz is obtained. The quadrupole interaction is the result of spin-orbit coupling at the spin-polarized Au ion breaking the cubiclattice symmetry. The Korringa constant CK for relaxation of the ' 'Au nuclei is measured as 1.2 Ksec.
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