“…Thus the rate of relaxation of excited nuclei depends on the proximity of protons and other factors, and by using a time-resolved measurement system (dipolar dephasing), one can extract more information and can classify the carbon atoms into as many as six different molecular environments Gerstein et al, 1982;Wilson et al, 1982Wilson et al, , 1983aPugmire et al, 1983a,b;Havens et al, 1983). Thus the rate of relaxation of excited nuclei depends on the proximity of protons and other factors, and by using a time-resolved measurement system (dipolar dephasing), one can extract more information and can classify the carbon atoms into as many as six different molecular environments Gerstein et al, 1982;Wilson et al, 1982Wilson et al, , 1983aPugmire et al, 1983a,b;Havens et al, 1983).…”