Nuclear-Magnetic-Resonance Study of the Formation and Structure of an AdsorbedHe3Monolayer

Abstract

Nuclear magnetic relaxation times have been measured for fractional monolayer coverages of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ adsorbed on Vycor glass. Above $\frac{1}{3}$ monolayer the spin-lattice relaxation time decreases sharply, and the spin-spin relaxation time increases, indicating a considerable change in the configuration and mobility of the atoms. Above ½ monolayer the atoms probably condense into a two-dimensional solid, with exchange tunneling of characteristic frequency considerably larger than that in bulk solid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$.