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Updated: Jul 19, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
Exotic behavior of hydrogen atoms in solid H2 at temperatures below 1 K
J Ahokas1, J Järvinen, V V Khmelenko
1Wihuri Physical Laboratory, Department of Physics, University of Turku, 20014 Turku, Finland.
Abstract:
We present the first magnetic resonance study of atomic hydrogen embedded in solid H2 films for temperatures 150-900 mK. We found that at T approximately 150 mK average concentrations of H atoms of order 10(18 cm(-3) are very stable against recombination during two weeks of observations. The distribution of the population of the two lowest hyperfine states is found to be non-Boltzmann, with a very large occupation of the ground state. We consider the possibility of formation in solid H2 of regions with high local concentrations of H atoms, where collective quantum phenomena might occur.
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