Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen
We report infrared spectroscopic studies of H₂ ortho-para (o/p) conversion in solid hydrogen doped with Clatoms at 2 K while the Cl+H₂(v=1)→HCl+H infrared-induced chemical reaction is occurring. The Cl-atom doped hydrogen crystals are synthesized using 355 nm in situ photodissociation of Cl₂ precurs...
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| Published in: | Физика низких температур |
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| Date: | 2010 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2010
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/117038 |
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| Cite this: | Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen / P.L. Raston, S.C. Kettwich, D.T. Anderson // Физика низких температур. — 2010. — Т. 36, № 5. — С. 495-503. — Бібліогр.: 31 назв. — англ. |
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Raston, P.L. Kettwich, S.C. Anderson, D.T. 2017-05-19T09:06:26Z 2017-05-19T09:06:26Z 2010 Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen / P.L. Raston, S.C. Kettwich, D.T. Anderson // Физика низких температур. — 2010. — Т. 36, № 5. — С. 495-503. — Бібліогр.: 31 назв. — англ. 0132-6414 PACS: 66.30.Ma, 67.80.F–, 67.80.dj https://nasplib.isofts.kiev.ua/handle/123456789/117038 We report infrared spectroscopic studies of H₂ ortho-para (o/p) conversion in solid hydrogen doped with Clatoms at 2 K while the Cl+H₂(v=1)→HCl+H infrared-induced chemical reaction is occurring. The Cl-atom doped hydrogen crystals are synthesized using 355 nm in situ photodissociation of Cl₂ precursor molecules. For hydrogen solids with high ortho-H₂ fractional concentrations (Xo=0.55), the o/p conversion kinetics is dominated by Cl-atom catalyzed conversion with a catalyzed conversion rate constant Kcc=1.16(11) min⁻¹ and the process is rate-limited by ortho-H₂ quantum diffusion. For hydrogen crystals with low ortho-H₂ concentrations (Xo=0.03), single-exponential decay of the ortho-H₂ concentration with time is observed which is attributed to H-atom catalyzed o/p conversion by the H-atoms produced during the infrared-induced Cl+H₂ reaction. The measured H-atom catalyzed o/p conversion kinetics indicates the H-atoms are mobile under these conditions in agreement with previous ESR measurements. This work was sponsored in part by the Chemistry Division of the US National Science Foundation (CHE 03-16268, CHE 08-48330). en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Nanostructures and Impurity Centers in Cryogenic Environment Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen |
| spellingShingle |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen Raston, P.L. Kettwich, S.C. Anderson, D.T. Nanostructures and Impurity Centers in Cryogenic Environment |
| title_short |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen |
| title_full |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen |
| title_fullStr |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen |
| title_full_unstemmed |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen |
| title_sort |
infrared studies of ortho-para conversion at cl-atom and h-atom impurity centers in cryogenic solid hydrogen |
| author |
Raston, P.L. Kettwich, S.C. Anderson, D.T. |
| author_facet |
Raston, P.L. Kettwich, S.C. Anderson, D.T. |
| topic |
Nanostructures and Impurity Centers in Cryogenic Environment |
| topic_facet |
Nanostructures and Impurity Centers in Cryogenic Environment |
| publishDate |
2010 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
We report infrared spectroscopic studies of H₂ ortho-para (o/p) conversion in solid hydrogen doped with Clatoms at 2 K while the Cl+H₂(v=1)→HCl+H infrared-induced chemical reaction is occurring. The Cl-atom doped hydrogen crystals are synthesized using 355 nm in situ photodissociation of Cl₂ precursor molecules. For hydrogen solids with high ortho-H₂ fractional concentrations (Xo=0.55), the o/p conversion kinetics is dominated by Cl-atom catalyzed conversion with a catalyzed conversion rate constant Kcc=1.16(11) min⁻¹ and the process is rate-limited by ortho-H₂ quantum diffusion. For hydrogen crystals with low ortho-H₂ concentrations (Xo=0.03), single-exponential decay of the ortho-H₂ concentration with time is observed which is attributed to H-atom catalyzed o/p conversion by the H-atoms produced during the infrared-induced Cl+H₂ reaction. The measured H-atom catalyzed o/p conversion kinetics indicates the H-atoms are mobile under these conditions in agreement with previous ESR measurements.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/117038 |
| citation_txt |
Infrared studies of ortho-para conversion at Cl-atom and H-atom impurity centers in cryogenic solid hydrogen / P.L. Raston, S.C. Kettwich, D.T. Anderson // Физика низких температур. — 2010. — Т. 36, № 5. — С. 495-503. — Бібліогр.: 31 назв. — англ. |
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| first_indexed |
2025-12-01T14:44:37Z |
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2025-12-01T14:44:37Z |
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