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Issue 4, 2017
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ESR study of atomic hydrogen and tritium in solid T2 and T2:H2 matrices below 1 K

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Abstract

We report on the first ESR study of atomic hydrogen and tritium stabilized in solid T2 and T2:H2 matrices down to 70 mK. The concentrations of T atoms in pure T2 approached 2 × 1020 cm−3 (0.60%) and record-high concentrations of H atoms ∼1 × 1020 cm−3 (0.33%) were reached in T2:H2 solid mixtures where a fraction of T atoms became converted into H due to the isotopic exchange reaction T + H2 → TH + H. The maximum concentrations of unpaired T and H atoms were limited by their recombination which becomes enhanced by efficient atomic diffusion due to the presence of a large number of vacancies and phonons generated in the matrices by β-particles. Recombination also appeared in an explosive manner, both being stimulated and spontaneously in thick films where sample cooling was insufficient. We suggest that the main mechanism for H and T migration is physical diffusion related to tunneling or hopping to vacant sites in contrast to tunneling chemical exchange reactions which govern diffusion of H and D atoms created in H2 and D2 matrices by other methods.

Graphical abstract: ESR study of atomic hydrogen and tritium in solid T2 and T2:H2 matrices below 1 K

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Supplementary files

Article information


Submitted
10 Oct 2016
Accepted
28 Dec 2016
First published
03 Jan 2017

Phys. Chem. Chem. Phys., 2017,19, 2834-2842
Article type
Paper

ESR study of atomic hydrogen and tritium in solid T2 and T2:H2 matrices below 1 K

S. Sheludiakov, J. Ahokas, J. Järvinen, L. Lehtonen, O. Vainio, S. Vasiliev, D. M. Lee and V. V. Khmelenko, Phys. Chem. Chem. Phys., 2017, 19, 2834 DOI: 10.1039/C6CP06933A

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