caa a22 4500 445365722 CHVBK 20180317142929.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10909-010-0317-x doi (NATIONALLICENCE)springer-10.1007/s10909-010-0317-x Atomic Hydrogen in Thick H2 Films at Temperatures 0.05-2K [Elektronische Daten] [J. Järvinen, V. Khmelenko, D. Lee, J. Ahokas, S. Vasiliev] We describe experiments on hydrogen atoms stabilized in a 100μm thick H2 film at temperatures between 0.05 and 2K. The molecular hydrogen matrix was condensed directly from natural hydrogen gas. The H atoms are produced with a plasma discharge at temperatures below 1K and studied with electron spin resonance. H densities of 2×1019cm−3 in solid H2 were reached. As observed earlier in thin H2 films, we found a high stability of atomic populations and strong deviation from Boltzmann statistics of lowest two hyperfine states at the lowest temperatures. In thick films we found that the ESR resonance lines consisted of two closely spaced components with different widths indicating separate regions of high and low concentrations of H atoms in the H2 matrix. Upon warming, the two components show very different rates of recombination with the higher density component having a faster recombination rate at T>1K. We discuss the atomic interactions and mobility, and also the structure of the samples of H atoms in the H2 matrix. Springer Science+Business Media, LLC, 2010 Hydrogen nationallicence Quantum solid nationallicence Electron-spin resonance nationallicence Järvinen J. Laboratory of Atomic and Solid State Physics, Cornell University, 14850, Ithaca, NY, USA aut Khmelenko V. Laboratory of Atomic and Solid State Physics, Cornell University, 14850, Ithaca, NY, USA aut Lee D. Laboratory of Atomic and Solid State Physics, Cornell University, 14850, Ithaca, NY, USA aut Ahokas J. Department of Physics and Astronomy, University of Turku, 20014, Turku, Finland aut Vasiliev S. Department of Physics and Astronomy, University of Turku, 20014, Turku, Finland aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/3-4(2011-02-01), 96-104 0022-2291 162:3-4<96 2011 162 10909 https://doi.org/10.1007/s10909-010-0317-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0317-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Järvinen J. Laboratory of Atomic and Solid State Physics, Cornell University, 14850, Ithaca, NY, USA aut NATIONALLICENCE 700 1- Khmelenko V. Laboratory of Atomic and Solid State Physics, Cornell University, 14850, Ithaca, NY, USA aut NATIONALLICENCE 700 1- Lee D. Laboratory of Atomic and Solid State Physics, Cornell University, 14850, Ithaca, NY, USA aut NATIONALLICENCE 700 1- Ahokas J. Department of Physics and Astronomy, University of Turku, 20014, Turku, Finland aut NATIONALLICENCE 700 1- Vasiliev S. Department of Physics and Astronomy, University of Turku, 20014, Turku, Finland aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/3-4(2011-02-01), 96-104 0022-2291 162:3-4<96 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer