Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)

The first observations 30 years ago of molecular clustering via quantum diffusion in solid H₂ in nuclear magnetic resonance (NMR) and pressure experiments are described. A previous review on quantum diffusion and tunneling up to 1986 is updated to reflect progress in the last ten years. In particula...

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Бібліографічні деталі
Дата:1998
Автор: Meyer, H.
Формат: Стаття
Мова:Russian
Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1998
Назва видання:Физика низких температур
Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/176604
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) / H.Meyer // Физика низких температур. — 1998. — Т. 24, № 6. — С. 507-521. — Бібліогр.: 51 назв. — рос.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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spelling irk-123456789-1766042021-02-06T01:26:01Z Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) Meyer, H. The first observations 30 years ago of molecular clustering via quantum diffusion in solid H₂ in nuclear magnetic resonance (NMR) and pressure experiments are described. A previous review on quantum diffusion and tunneling up to 1986 is updated to reflect progress in the last ten years. In particular I review the effect of clustering on heat capacity in solid D₂ and on the thermal conductivity in solid H₂. The configurational relaxation time observed in D₂ at 1.75K is found to scale with that in H₂ at the same temperature in terms of the predictions of ortho-para resonant conversion-induced hopping. The relaxation times measured simultaneously on the same sample in NMR and conductivity experiments reflect different configurational processes. The theory of molecular hopping and pairing in solid H₂ is outlined and compared with experiments. The tunneling frequency of HD in solid H₂ deduced from transverse and longitudinal NMR relaxation experiments between 0.03 and 14K is discussed. The hopping of ortho-H₂, invoked as a mechanism in the enhanced ortho-para conversion in presence of O₂ impurities, is mentioned. Finally, recent tunneling results for H, D and H₂- anions in solid H₂ during the studies of low temperature reaction dynamics are also briefly described. In the Appendix, the hopping frequency determination in HD from NMR transverse relaxation time measurements is reviewed. 1998 Article Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) / H.Meyer // Физика низких температур. — 1998. — Т. 24, № 6. — С. 507-521. — Бібліогр.: 51 назв. — рос. 0132-6414 PACS: 67.80.-s http://dspace.nbuv.gov.ua/handle/123456789/176604 ru Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language Russian
description The first observations 30 years ago of molecular clustering via quantum diffusion in solid H₂ in nuclear magnetic resonance (NMR) and pressure experiments are described. A previous review on quantum diffusion and tunneling up to 1986 is updated to reflect progress in the last ten years. In particular I review the effect of clustering on heat capacity in solid D₂ and on the thermal conductivity in solid H₂. The configurational relaxation time observed in D₂ at 1.75K is found to scale with that in H₂ at the same temperature in terms of the predictions of ortho-para resonant conversion-induced hopping. The relaxation times measured simultaneously on the same sample in NMR and conductivity experiments reflect different configurational processes. The theory of molecular hopping and pairing in solid H₂ is outlined and compared with experiments. The tunneling frequency of HD in solid H₂ deduced from transverse and longitudinal NMR relaxation experiments between 0.03 and 14K is discussed. The hopping of ortho-H₂, invoked as a mechanism in the enhanced ortho-para conversion in presence of O₂ impurities, is mentioned. Finally, recent tunneling results for H, D and H₂- anions in solid H₂ during the studies of low temperature reaction dynamics are also briefly described. In the Appendix, the hopping frequency determination in HD from NMR transverse relaxation time measurements is reviewed.
format Article
author Meyer, H.
spellingShingle Meyer, H.
Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)
Физика низких температур
author_facet Meyer, H.
author_sort Meyer, H.
title Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)
title_short Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)
title_full Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)
title_fullStr Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)
title_full_unstemmed Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article)
title_sort quantum diffusion and tunneling in the solid hydrogens: a short review (review article)
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 1998
url http://dspace.nbuv.gov.ua/handle/123456789/176604
citation_txt Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) / H.Meyer // Физика низких температур. — 1998. — Т. 24, № 6. — С. 507-521. — Бібліогр.: 51 назв. — рос.
series Физика низких температур
work_keys_str_mv AT meyerh quantumdiffusionandtunnelinginthesolidhydrogensashortreviewreviewarticle
first_indexed 2025-07-15T14:24:35Z
last_indexed 2025-07-15T14:24:35Z
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