Abstract
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 clusters formed in pores of solid Ne as well as in a Ne environment. Raising temperature from 0.1 to results in a rapid recombination of a significant fraction of both H and D atoms in HD and clusters. The recombination rate appears to be five and seven orders of magnitude faster than in solid bulk samples of HD and , 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 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 .
1 More- Received 27 March 2019
- Revised 9 May 2019
DOI:https://doi.org/10.1103/PhysRevB.99.174514
©2019 American Physical Society