Nuclear spin relaxation and molecular diffusion in liquid hydrogen |
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| Affiliation: | 1. Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada;2. National Institute for Nanotechnology, 11421 Saskatchewan Drive, Edmonton, Alberta, T6G 2M9, Canada;3. Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, 2519 Jiefang Road, Changchun, 130023, People’s Republic of China;4. Department of Chemistry, Carleton University, Ottawa, Ontario, K1S 5B6, Canada;1. The Graduate University for Advanced Studies, 322-6 Oroshi, Toki 509-5292, Gifu, Japan;2. National Institute for Fusion Science, 322-6 Oroshi, Toki 509-5292, Gifu, Japan;1. Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Del Libertador 8250, 1429 Buenos Aires, Argentina;2. Universidad Tecnológica Nacional, Facultad Regional Buenos Aires, Medrano 951, 1179 Buenos Aires, Argentina;3. Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, 25 de Mayo y Francia, 1650 San Martín, Prov. Buenos Aires, Argentina |
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| Abstract: | The nuclear spin lattice relaxation time T1 and the diffusion coefficient D of liquid hydrogen have been measured between 14°K and 20°K by the spin echo technique. The temperature dependence of the quantities does not agree with recent predictions of their behaviour. However, the observed dependence of T1 on ortho hydrogen concentration indicates that the reorientation of the ortho molecules within the liquid is best explained in terms of a collision theory description.An appendix is devoted to a discussion of the influence of diffusion on spin echoes. |
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