1. The Grafoil sheet, GTA grade, was obtained from Union Carbide, Carbon Products Division, Cleveland, Ohio.
2. Sterling FT (similar to graphitized P-33) was obtained from the Cabot Corporation, Boston, Massachusetts. These graphite particles are ~ 0.2µm in diameter and are polyhedra with the basal plane exposed. The specific area is given as 13m2/gram of powder.
3. D. P. Grimmer and K. Luszczynski, “NMR in He3 Monolayers Adsorbed on Graphite Below 4.2K,” Proceedings of the Thirteenth International Conference on Low Temperature Physics, Boulder, Colorado, August 1972.
4. M. Bretz and J. G. Dash, Phys. Rev. Letters 26, 963 (1971).
5. H. Y. Carr and E. M. Purcell, Phys. Rev. 94, 630 (1954).