Hydrogen Molecular Ions in Solid Parahydrogen: EPR Studies at Cryogenic Temperatures

Kumagai, Jun

doi:10.1007/978-3-319-09216-4_4

Jun Kumagai³

1195 Accesses

Abstract

Electron paramagnetic resonance (EPR) spectroscopy for the assignment of H₆ ⁺ and its isotopomers, analysis of large precessional motion of them, and isotope condensation of H₆ ⁺ in solid parahydrogen at cryogenic temperature is treated in this chapter. The structure of H₆ ⁺ consisting of an H₂ ⁺-core sandwiched with two side-on H₂s is confirmed to have D ₂ symmetry by the comparison of the experimental hyperfine coupling constants (HFCC) with the theoretical ones. The substitution of one side-on H₂ with D₂ induced distortion of the spin density and nonequivalent HFCCs on the H₂ ⁺-core indicating that the quantum effect due to nuclear motion cannot be ignored in this system. Rotational states of side-on D₂ and H₂ are attributable to J = 0 from the corresponding nuclear spin states of I = 0 and 0, 2 for H₂ and D₂, respectively. The H₆ ⁺ ion migrates via hole hopping diffusion of H₂ ⁺-core in solid parahydrogen, and turns into more stable H₄D₂ ⁺ or H₂D₄ ⁺ ion when it meets D₂ molecules. During the diffusion, H₆ ⁺ and H₄D₂ ⁺ are in large precessional motion as indicated by an analysis of the anisotropic HFCCs.

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Acknowledgments

The author would like to express great appreciation to editors of Profs. M. Shiotani and A. Lund for giving me a chance to introduce our study. The author also would like to appreciate to Drs. T. Kumada (Japan Atomic Energy Agency) and Y. Shimizu (Nippon Light Metal Company, Ltd) for many experiments and discussions on this H₆ ⁺ study.

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Eco-Topia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, 464-8601, Nagoya, Japan
Jun Kumagai

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Correspondence to Jun Kumagai .

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The Emeritus Academy Linköping University, Linköping, Sweden
Anders Lund
Hiroshima University, Higashi-Hiroshima, Japan
Masaru Shiotani

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Kumagai, J. (2014). Hydrogen Molecular Ions in Solid Parahydrogen: EPR Studies at Cryogenic Temperatures. In: Lund, A., Shiotani, M. (eds) Applications of EPR in Radiation Research. Springer, Cham. https://doi.org/10.1007/978-3-319-09216-4_4

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DOI: https://doi.org/10.1007/978-3-319-09216-4_4
Published: 21 October 2014
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-09215-7
Online ISBN: 978-3-319-09216-4
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)

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