Multiple quantum NMR and relaxation of an oriented CH3 group

Abstract

NMR relaxation of the n‐quantum transitions (n=1,2,3) for an oriented CH₃ group by paramagnetic impurities is discussed. The n‐quantum spectra are presented, and the effect of the correlation of fluctuations in random fields at the three proton sites on symmetry‐breaking relaxation transitions is outlined. Experimental results on acetonitrile dissolved in liquid crystalline EBBA with paramagnetic DTBN are presented together with a discussion on correlations of fluctuation and correlation times.