Proton spin echo study of spin-spin relaxation in liquid crystals

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Abstract
Proton spin-spin relaxation times ``T2'' were measured as a function of temperature in the nematic phase of p-methoxybenzylidene-p-n-butylaniline and in the nematic and smectic C phases of p-n-heptyloxyazobenzene using the 90°–45° echo. By comparing ``T2'' in these two liquid crystals, we infer that short range smectic order exists even 10° above the nematic-smectic C phase transition in p-n-heptyloxyazobenzene. The angular dependence in ``T2'' was also determined in the smectic C phase at two different temperatures.

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