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Low temperature nmr study of two-dimensional molecular motion

✍ Scribed by Richard F. Tennis; Feng Li; Wiley P. Kirk

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
244 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

The magnetic properties of surface layers of methane physisorbed on porous silicon have been studied in detail for several submonolayer coverages. At 0.6 monolayer, the spin-lattice relaxation time T, versus temperature showed two minima and two discontinuities between 1.3K and 73K, while at 0.3 monolayer the T, behavior was much more complex. At 0.8 monolayer, T, increased dramatically by several orders of magnitude. The restriction of the pore size is believed to be responsible for this unusual T, behavior. The relaxation times for the 0.3 and 0.8 monolayers were non-exponential, due to the presence of two or three groups of spins whose local environments were different from each other.

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