Pulsed NMR measurements at 30 MHz of near-monolayer coverages of 3He on Grafoil have been made between 4.2 and 0.1 K. The time constants of the free induction decay indicate that below 4.2 K the mobility of 3He in an exact monolayer is smaller than that at lower coverages or at coverages above one monolayer, in agreement with the results found by Hegde and Daunt, by Cowan and co-workers, and by Rollefson. Furthermore, in spite of rf heating of the sample, we were able to conclude that the mobility of 3He in nearmonolayers films decreases as the temperature is decreased below 4.2 K. At 4K and 30MHz our measurements give T1 = 1 ± 0.3 sec for coverages between 0.6 and 1.35 monolayers. This is in agreement with previous work.
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Husa, D.L., Hickernell, D.C. & Daunt, J.G. Pulsed NMR of monolayer and near-monolayer films of 3He adsorbed on Grafoil at low temperatures. J Low Temp Phys 34, 157–167 (1979). https://doi.org/10.1007/BF00118553
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DOI: https://doi.org/10.1007/BF00118553