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Atomic hydrogen-deuterium mixtures at 1 kelvin: Recombination rates, spin-exchange cross sections, and solvation energies

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Abstract

A new technique has been applied to the study of atomic hydrogen and deuterium mixtures confined by liquid helium coated walls. The method uses standard low-field hyperfine magnetic resonance of the H atoms at 1420 MHz, but takes advantage of the dramatically different spin-exchange broadening for H-H and H-D collisions to simultaneously monitor the H and D densities. This provides a powerful means for studying the interaction of D with itself and with liquid helium, something otherwise difficult to achieve, and it also makes possible the study of spin-exchange and recombination interactions between H and D. A wide range of experimental results are presented, including the rate constants for H-D and D-D recombination, the spin-exchange broadening cross sections for H-D and D-D collisions, the H-D spin-exchange frequency shift cross section and an improved value for the H-4He buffer gas shift. Finally, a detailed study of the solvation of D into liquid4He has yielded an improved value for the salvation energy, a useful lower bound for the effective mass for D in liquid4He, and evidence for the reaction D + HD → D2 + H on the surface under the liquid4He film.

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  1. M. E. Hayden

    Present address: Department of Condensed Matter and Thermal Physics, LOs Alamos National Laboratory, Mail Stop K764, 87545, Los Alamos, NM, USA

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  1. Department of Physics, University of British Columbia, V6T 1Z1, Vancouver, B.C., Canada

    M. E. Hayden & W. N. Hardy

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Hayden, M.E., Hardy, W.N. Atomic hydrogen-deuterium mixtures at 1 kelvin: Recombination rates, spin-exchange cross sections, and solvation energies. J Low Temp Phys 99, 787–849 (1995). https://doi.org/10.1007/BF00753562

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