Quasi-one-dimensional diffusion of He impurities in molecular solid hydrogen at low temperatures
В. А. МихеевPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Khar'kovV. A. Maı̆danovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Khar'kovN. P. MikhinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Khar'kov
ABI
Аннотация
The method of pulsed nuclear magnetic resonance has been used to investigate the diffusion of 3He impurities in the matrix of solid molecular parahydrogen at temperatures to 0.5 °K and pressures to 120 atm. It has been shown that at an 3He concentration of ∼0.1% and pressures above 20 atm the attenuation of the NMR signal is essentially nonexponential; this is explained within the framework of a proposed model of quasi-one-dimensional diffusion of 3He along dislocation lines in the parahydrogen crystal.
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