Photochemistry of HCl in rare gas matrices
НС1 is dissociated by excitation to the purely repulsive A¹ Π state and the dissociation fragments are probed via the fluorescence from charge transfer states with the rare gas atom using tunable synchrotron radiation from BESSY (Berlin). The quantum efficiency for the dissociation of HC1 monomers i...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 1996 |
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| Format: | Artikel |
| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1996
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Photochemistry of HCl in rare gas matrices / K. Godders, N. Schwentner // Физика низких температур. — 1996. — Т. 22, № 2. — С. 205-209. — Бібліогр.: 25 назв. — англ. |
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Godders, K. Schwentner, N. 2021-02-04T20:11:24Z 2021-02-04T20:11:24Z 1996 Photochemistry of HCl in rare gas matrices / K. Godders, N. Schwentner // Физика низких температур. — 1996. — Т. 22, № 2. — С. 205-209. — Бібліогр.: 25 назв. — англ. 0132-6414 https://nasplib.isofts.kiev.ua/handle/123456789/176509 НС1 is dissociated by excitation to the purely repulsive A¹ Π state and the dissociation fragments are probed via the fluorescence from charge transfer states with the rare gas atom using tunable synchrotron radiation from BESSY (Berlin). The quantum efficiency for the dissociation of HC1 monomers in Xe matrices yields a matrix induced barrier of 1.4 eV and a linear increase with excess energy of the H atoms, which agrees with MD simulations. Dissociation of HC1 dimers leads to Cl₂ and H₂ formation by two different reaction mechanisms. In the low energy part (1.9 eV < £|yn < 4.4 eV), MD simulations suggest a reaction via multidimensional energy surfaces with a quantum efficiency below 1 %, which is confirmed by our experiments. In the higher energy part (Ekin > 4.4 eV) an impact mechanism is dominant, where the H fragment kicks the H atom off a nearby HC1 molecule. Photoinduced and thermal mobilities of H atoms in Xe and Ar matrices were measured. A pathlength for photomobilized H atoms of 19 A at a kinetic energy of 2.0 eV was estimated from the recombination efficiency of H and Cl atoms by thermal activation. In Ar matrices a H atom pathlength of (21 ± 2) A at = 2.5 eV was measured from the capture efficiency of codoped Xe traps. From theH loss at 44 К in Xe matrices a thermal diffusion constant of (7-2 ± 1.5) -10-¹³ cm²/s for H in Xe was determined. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) Photochemistry of HCl in rare gas matrices Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Photochemistry of HCl in rare gas matrices |
| spellingShingle |
Photochemistry of HCl in rare gas matrices Godders, K. Schwentner, N. Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) |
| title_short |
Photochemistry of HCl in rare gas matrices |
| title_full |
Photochemistry of HCl in rare gas matrices |
| title_fullStr |
Photochemistry of HCl in rare gas matrices |
| title_full_unstemmed |
Photochemistry of HCl in rare gas matrices |
| title_sort |
photochemistry of hcl in rare gas matrices |
| author |
Godders, K. Schwentner, N. |
| author_facet |
Godders, K. Schwentner, N. |
| topic |
Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) |
| topic_facet |
Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) |
| publishDate |
1996 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
НС1 is dissociated by excitation to the purely repulsive A¹ Π state and the dissociation fragments are probed via the fluorescence from charge transfer states with the rare gas atom using tunable synchrotron radiation from BESSY (Berlin). The quantum efficiency for the dissociation of HC1 monomers in Xe matrices yields a matrix induced barrier of 1.4 eV and a linear increase with excess energy of the H atoms, which agrees with MD simulations. Dissociation of HC1 dimers leads to Cl₂ and H₂ formation by two different reaction mechanisms. In the low energy part (1.9 eV < £|yn < 4.4 eV), MD simulations suggest a reaction via multidimensional energy surfaces with a quantum efficiency below 1 %, which is confirmed by our experiments. In the higher energy part (Ekin > 4.4 eV) an impact mechanism is dominant, where the H fragment kicks the H atom off a nearby HC1 molecule. Photoinduced and thermal mobilities of H atoms in Xe and Ar matrices were measured. A pathlength for photomobilized H atoms of 19 A at a kinetic energy of 2.0 eV was estimated from the recombination efficiency of H and Cl atoms by thermal activation. In Ar matrices a H atom pathlength of (21 ± 2) A at = 2.5 eV was measured from the capture efficiency of codoped Xe traps. From theH loss at 44 К in Xe matrices a thermal diffusion constant of (7-2 ± 1.5) -10-¹³ cm²/s for H in Xe was determined.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/176509 |
| citation_txt |
Photochemistry of HCl in rare gas matrices / K. Godders, N. Schwentner // Физика низких температур. — 1996. — Т. 22, № 2. — С. 205-209. — Бібліогр.: 25 назв. — англ. |
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AT goddersk photochemistryofhclinraregasmatrices AT schwentnern photochemistryofhclinraregasmatrices |
| first_indexed |
2025-12-07T17:48:27Z |
| last_indexed |
2025-12-07T17:48:27Z |
| _version_ |
1850872648054079488 |