Temperature Dependence of the Pure Quadrupole Frequency and Spin—Lattice Relaxation Time of p-Dibromobenzene

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Abstract
The dependence of the 79Br and 81Br pure quadrupole resonance frequencies on temperature in p‐dibromobenzene have been measured over the temperature range 4.2° to 77°K. The results are compared with the Bayer theory, using values for the torsional frequencies obtained from the Raman data for p‐dibromobenzene. Good agreement with the theory is obtained if both the low‐frequency and high‐frequency modes are included in the calculation. The spin—lattice relaxation time of the resonance has been measured in the range 4.2° to 7.5°K and the relaxation time was found to be proportional to T9 in this limited temperature region. The experimental results are compared with the Bayer theory.

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