Nuclear Magnetic Resonance of Cl35 in a Single Crystal of NaClO3

Nuclear spin-lattice relaxation due to quadrupole interaction of Cl 35 in a single crystal of NaClO 3 under an applied magnetic field was investigated by using saturation- as well as double resonance-techniques. The relaxation through Δ m =1 was found to be more effective than that through Δ m =2. The experimental result at room temperature can be accounted for by Bayer's theory, if we assume an appropriate life time of the excited vibrational state. When one of the high frequency lines was pumped, an enhanced absorption or emission of the low frequency Zeeman line was observed, which corresponds to nuclear three level maser effect. Finally chemical shift of Cl 35 in this crystal was measured for two different orientations. The absolute value and a slight anisotropy of the shift can be well explained by second-order paramagnetic shift.