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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| Опубліковано в: : | Физика низких температур |
|---|---|
| Дата: | 1998 |
| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1998
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/175524 |
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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. — англ. |
Репозитарії
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nasplib_isofts_kiev_ua-123456789-175524 |
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Meyer, H. 2021-02-01T16:25:21Z 2021-02-01T16:25:21Z 1998 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. — англ. 0132-6414 https://nasplib.isofts.kiev.ua/handle/123456789/175524 PACS: 67.80.-s 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. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) |
| spellingShingle |
Quantum diffusion and tunneling in the solid hydrogens: a short review (Review Article) Meyer, H. |
| 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) |
| author |
Meyer, H. |
| author_facet |
Meyer, H. |
| publishDate |
1998 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| 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.
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| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/175524 |
| 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. — англ. |
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2025-12-07T15:52:50Z |
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2025-12-07T15:52:50Z |
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1850865374094950400 |