Line Width of the Pure Quadrupole Resonance of Bromine in NaBrO3

Using a regenerative spectrometer the line widths of the two bromine isotopes in NaBrO 3 were measured at melting ice and liquid oxygen temperatures. The full width at half-maximum intensity of Br 79 is 3.85±0.1 kc and that of Br 81 is 4.09±1 kc. No observable dependence of the line width on temperature was found. From the ratio of the line widths it is concluded that the main cause of the line width in NaBrO 3 is the magnetic dipole interaction, and the contribution from the relaxation is of the order of 0.1 kc.