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Nuclear-Polarized Phases of H Atoms Embedded in Solid Molecular Hydrogen Films

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Abstract

We report on an electron-spin resonance study of nuclear-polarized phases of hydrogen atoms embedded in solid H\(_{2}\) films at temperatures 0.1–1.5 K and a high magnetic field of 4.6 T. The H atoms in solid H\(_{2}\) were generated by two different dissociation techniques: a cryogenic rf-discharge and bombardment by 5.7 keV electrons via tritium decay. In both studies, we observed a build-up of a spontaneous nuclear-polarized phase (SNPP, p=0.35) at temperatures below \(\sim \)0.8 K similar to that reported in our previous work. We were also able to create a highly nuclear-polarized phase (HNPP, \(p\simeq \)0.75) using Dynamic Nuclear Polarization for samples exposed to a cryogenic rf discharge, whereas we failed to obtain this phase for the samples bombarded by 5.7 keV electrons. We suggest that failing to achieve the HNPP in the samples exposed to high-energy electrons released during tritium decay may be explained by an effect of faster nuclear relaxation stimulated by electrons bombarding the H\(_{2}\) matrix and rapidly relaxing centers in the film substrate created during accumulation of H atoms in solid H\(_{2}\).

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Data Availability Statement

Data are available on reasonable request

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Acknowledgements

This work has been supported by National Science Foundation Grant No. DMR 2104756, Academy of Finland Grant No. 317141, and Office of the Naval Research Grant N00014-20-1-2184.

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Author notes

  1. S. Sheludiakov

    Present address: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, 15260, USA

Authors and Affiliations

  1. Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843, USA

    S. Sheludiakov, D. M. Lee & V. V. Khmelenko

  2. Department of Physics and Astronomy, University of Turku, 20014, Turku, Finland

    J. Ahokas, J. Järvinen & S. Vasiliev

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  1. S. Sheludiakov
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  2. D. M. Lee
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  3. V. V. Khmelenko
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  4. J. Ahokas
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  5. J. Järvinen
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  6. S. Vasiliev
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Sheludiakov, S., Lee, D.M., Khmelenko, V.V. et al. Nuclear-Polarized Phases of H Atoms Embedded in Solid Molecular Hydrogen Films. J Low Temp Phys 208, 67–86 (2022). https://doi.org/10.1007/s10909-021-02627-2

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