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Purely Spatial Quantum Diffusion of H Atoms in Solid H-2 at Temperatures below 1 K
Tekijät: Sheludiakov Sergei, Lee D. M., Khmelenko Vladimir V., Järvinen Jarno, Ahokas Janne, Vasiliev Sergey
Kustantaja: AMER PHYSICAL SOC
Julkaisuvuosi: 2021
Journal: Physical Review Letters
Tietokannassa oleva lehden nimi: PHYSICAL REVIEW LETTERS
Lehden akronyymi: PHYS REV LETT
Artikkelin numero: ARTN 195301
Vuosikerta: 126
Numero: 19
Sivujen määrä: 5
ISSN: 0031-9007
eISSN: 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.126.195301
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/59546959
We report on a direct measurement of the quantum diffusion of H atoms in solid molecular hydrogen films at T = 0.7 K. We obtained a rate of pure spatial diffusion of H atoms in the H-2 films, D-d = 5(2) x 10(-17) cm(2) s(-1), which was 2 orders of magnitude faster than that obtained from H atom recombination, the quantity used in all previous work to characterize the mobility of H atoms in solid H-2. We also observed that the H-atom diffusion was significantly enhanced by injection of phonons. Our results provide the first measurement of the pure spatial diffusion rate for H atoms in solid H-2, the only solid state system beside He-3 - He-4 mixtures, where atomic diffusion does not vanish even at temperatures below 1 K.
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