A1 Refereed original research article in a scientific journal
Evidence for melting of HD and D-2 clusters in solid neon below 1 K
Authors: Sheludiakov S, Ahokas J, Jarvinen J, Lehtonen L, Vasiliev S, Dmitriev YA, Lee DM, Khmelenko VV
Publisher: AMER PHYSICAL SOC
Publication year: 2019
Journal: Physical Review B
Journal name in source: PHYSICAL REVIEW B
Journal acronym: PHYS REV B
Article number: ARTN 174514
Volume: 99
Issue: 17
Number of pages: 8
ISSN: 2469-9950
eISSN: 2469-9969
DOI: https://doi.org/10.1103/PhysRevB.99.174514
Web address : https://journals.aps.org/prb/pdf/10.1103/PhysRevB.99.174514
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/41070933
We report on an electron spin resonance study of H and D atoms stabilized in solid mixtures of neon, molecular deuterium, and hydrogen deuteride. We observed that H and D atoms can be stabilized in pure HD and D-2 clusters formed in pores of solid Ne as well as in a Ne environment. Raising temperature from 0.1 to 1.3 K results in a rapid recombination of a significant fraction of both H and D atoms in HD and D-2 clusters. The recombination rate appears to be five and seven orders of magnitude faster than in solid bulk samples of HD and D-2, respectively. We explain this recombination rate enhancement by melting of clusters of molecular hydrogen isotopes, similar to what has been observed for atomic hydrogen in H-2 clusters [Sheludiakov et al., Phys. Rev. B 97, 104108 (2018)]. Our observations do not provide evidence for a superfluid behavior of these clusters at temperatures of 0.1-1.3 K.
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