Abstract
Measurements of the 3He nuclear spin-spin relaxation time, T2, have been carried out for commensurate layers of 3He-Ne mixtures adsorbed on hexagonal boron nitride for temperatures 0.2< T <10 K. A temperature independent relaxation is observed at low temperatures and is interpreted in terms of the effective exchange frequencies for 3He particle exchange on the surface. The results show a strong dependence on the fraction of neon in the adsorbed layer. This variation is discussed in terms of a multiple spin exchange model for 3He in a monolayer. The contributions to T2 from different components of the exchange, 2-spin exchange (J2), 3-spin exchange (J3), 4-spin exchange (J4) and higher exchange permutations depend on the 3He coverage and thus permit the separation of the amplitudes of the different exchange rates, and in particular allow one to deduce the relative strengths of 2-atom and 3-atom exchange where other methods are sensitive only to the effective two-particle term Jeff = J2 - 2J3.
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