Rotational States of NH^+_4 in Dilute Solution in Alkali Halide Lattices. II. An NMR Study of KBr/NH_4Br
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概要
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Nuclear magnetic relaxation of the protons of NH.' in dilute solution (0.5motel) in KBr is measured between 2 and 259 K. The approach to equilibriumat 4.2 K is slow, the time constant being 1.5 f 0.2 hr, owing to conversion betweennuclear spin symmetry species. There is a minimum in the spin-lattice relaxationtime of 3.8.[.0.2 s at 5.3 K. From the slope of T. vs T " on the high temperatureside, the activation energy is found to be 105f10 J mole ", which approximatelycorresponds to some average of separations between low-lying rotational levels.The spin-spin relaxation time, T., is also long (1.0.1.0.1 ms) and independent oftemperature. The equilibrium value of<7(71-])>, the ensemble average of theresultant nuclear spin, is slightly less than 4.3 at 4.2 K. Deviations from Curie'sLaw are observed below about 10 K. These results are compatible with a modelof the NH.' ion as a three-dimensional quantum rotor placed in a potential fieldof octahedral symmetry.
- 社団法人日本物理学会の論文
- 1983-07-15
著者
-
Yamamoto Taisei
Department Of Chemistry Faculty Of Science Osaka University
-
Chihara Hideaki
Department Of Chemistr Faculty Of Science Osaka University
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