On the mechanism of quantum diffusion in solid hydrogen
А. И. КривчиковPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovM. I. Bagatskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. G. Manzheliı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. Ya. MinchinaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovP. I. MuromtsevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
An attempt is made to detect the quantum diffusion of paradeuterium in parahydrogen. Quantum diffusion can occur in this system only through a tunneling mass transfer of molecules. The investigation of the time dependence of the heat capacity of the p-D2 solution (0.94%) in p-H2 over a period of 290 h (T = 1.7 K) did not reveal any quantum diffusion. This means that the characteristic time of configurational relaxation is τ > 1·104 h. It is concluded that quantum diffusion in hydrogen is realized by a tunnel transfer of the angular momentum of molecules. The temperature dependence of the heat capacity of the solution is investigated in the temperature range between 0.5 and 6 K.
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