Using MgO powder as a substrate, the magnetic relaxation of 3He and adsorption isotherms of 3He and Kr have been measured. Relaxation data as a function of coverage were obtained at temperatures of 2.0,2.7, 3.5, and 4.2 K, and as a function of temperature at coverages of x = 0.84 and 1.0 monolayer. The Kr isotherms show steplike features whose size increases following an extended bakeout at 950 ‡C under vacuum. This is interpreted as indicating that the MgO surface consists of a mixture of uniform and nonuniform regions. Extended heating increases the fraction of the total surface area that is uniform. The values of T 2vs. coverage at T = 2 and 2.7 K are found to change from being roughly coverage independent to decreasing as x −3 at a coverage of x − 0.9, indicating a decrease in film mobility. At 3.5 and 4.2 K an approximately constant T 2is found at all coverages with no evidence of a sudden change of mobility. The low-temperature T 2data continue to decrease as the second layer forms, implying a low mobility for small second-layer coverages. On the basis of the relatively short values obtained for T 1 it is concluded that a relaxation mechanism in addition to dipolar coupling is present.
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Buzerak, R.F., Rollefson, R.J. 3He on MgO: Nuclear magnetic relaxation properties. J Low Temp Phys 38, 105–118 (1980). https://doi.org/10.1007/BF00115271
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DOI: https://doi.org/10.1007/BF00115271