Proton Relaxation in Hexamethylbenzene

Abstract

Proton T1 and T1ρ of solid hexamethylbenzene have been measured at 30 MHz from 4.2°K to above the melting point. The T1 results are in satisfactory agreement with similar measurements of Allen and Cowking, and of Anderson and Slichter. The T1ρ results confirm their conclusions concerning molecular motion over most of the solid-phase temperature range, but reveal a previously undetected motion just below the melting point. Mention is made of a method for measuring long T1's in solids.