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Issue 42, 2016
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Tunneling chemical exchange reaction D + HD → D2 + H in solid HD and D2 at temperatures below 1 K

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Abstract

We report on a study of the exchange tunneling reaction D + HD → D2 + H in a pure solid HD matrix and in a D2 matrix with a 0.23% HD admixture at temperatures between 130 mK and 1.5 K. We found that the exchange reaction rates, kexHD ∼ 3 × 10−27 cm3 s−1 in the pure HD matrix, and kexD2 = 9(4) × 10−28 cm3 s−1 in the D2 matrix, are nearly independent of temperature within this range. This confirms the quantum tunnelling nature of these reactions, and their ability to proceed at temperatures down to absolute zero. Based on these observations we concluded that exchange tunneling reaction H + H2 → H2 + H should also proceed in a H2 matrix at the lowest temperatures. On the other hand, the recombination of H atoms in solid H2 and D atoms in solid D2 is substantially suppressed at the lowest temperatures as a result of a decreased probability of resonant tunneling of atoms when they approach each other.

Graphical abstract: Tunneling chemical exchange reaction D + HD → D2 + H in solid HD and D2 at temperatures below 1 K

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Publication details

The article was received on 08 Aug 2016, accepted on 03 Oct 2016, published on 06 Oct 2016 and first published online on 06 Oct 2016


Article type: Paper
DOI: 10.1039/C6CP05486B
Citation: Phys. Chem. Chem. Phys., 2016,18, 29600-29606
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    Tunneling chemical exchange reaction D + HD → D2 + H in solid HD and D2 at temperatures below 1 K

    S. Sheludiakov, J. Ahokas, J. Järvinen, D. Zvezdov, L. Lehtonen, O. Vainio, S. Vasiliev, D. M. Lee and V. V. Khmelenko, Phys. Chem. Chem. Phys., 2016, 18, 29600
    DOI: 10.1039/C6CP05486B

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