3 years ago

Electron spin resonance study of atomic hydrogen stabilized in solid neon below 1K.

Sergey Vasiliev, Janne Ahokas, Vladimir Khmelenko, Sergey Sheludiakov, Yuri Dmitriev, Jarno Jarvinen, David Lee

We report on an electron spin resonance study of atomic hydrogen stabilized in a solid Ne matrices carried out at a high field of 4.6 T and temperatures below 1 K. The films of Ne, slowly deposited on the substrate at the temperature $\sim$1 K, exhibited a high degree of porosity. We found that H atoms may be trapped in two different substitutional positions in the Ne lattice as well as inside clusters of pure molecular H$_{2}$ in the pores of the Ne film. The latter type of atoms was very unstable against recombination at temperatures 0.3-0.6$\,$K. Based on the observed nearly instant decays after rapid small increase of temperature, we evaluate the lower limit of the recombination rate constant $k_{r}\geq5\cdot10^{-20}\,$cm$^{3}$s$^{-1}$ at 0.6$\,$K, five orders of magnitude larger than that previously found in the thin films of pure H$_{2}$ at the same temperature. Such behavior assumes a very high mobility of atoms and may indicate a solid-to-liquid transition for H$_{2}$ clusters of certain sizes, similar to that observed in experiments with H$_{2}$ clusters inside helium droplets (Phys. Rev. Lett 101, 205301 (2008)). We found that the efficiency of dissociation of H$_{2}$ in neon films is enhanced by 2 orders of magnitude compared to that in pure H$_{2}$, which is instigated by a strong emission of secondary electrons.

Publisher URL: http://arxiv.org/abs/1801.07089

DOI: arXiv:1801.07089v1

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