2015/09/18 by S. Sheludiakov, Sheludiakov, S., J. Ahokas +15
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic and Subatomic Physics Research #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.1509.05588
openalex publication_date 2015/09/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 0.23% HD admixture at temperatures between 130 mK and 1.5 K. We found that the exchange reaction rates, kexHD∼3×10-27cm3s-1 in the pure HD matrix, and k_exD2=9(4)×10-28cm-3 in the D2 matrix are nearly independent of temperature within this range. This confirms 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 contrary, 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 increasing of violation for resonance tunneling of atoms when they approach each other.