Photochemistry of HCl in rare gas matrices

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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Datum:1996
Hauptverfasser: Godders, K., Schwentner, N.
Format: Artikel
Sprache:English
Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 1996
Schriftenreihe:Физика низких температур
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Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995)
Online Zugang:http://dspace.nbuv.gov.ua/handle/123456789/176509
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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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spelling irk-123456789-1765092021-02-05T01:31:01Z Photochemistry of HCl in rare gas matrices Godders, K. Schwentner, N. Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995) 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. 1996 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/176509 en 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 English
topic Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995)
Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995)
spellingShingle Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995)
Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995)
Godders, K.
Schwentner, N.
Photochemistry of HCl in rare gas matrices
Физика низких температур
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.
format Article
author Godders, K.
Schwentner, N.
author_facet Godders, K.
Schwentner, N.
author_sort Godders, K.
title Photochemistry of HCl in rare gas matrices
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
publisher Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
publishDate 1996
topic_facet Специальный выпуск International Workshop on Cryocrystals and Quantum Crystals (CC-1995)
url http://dspace.nbuv.gov.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.
series Физика низких температур
work_keys_str_mv AT goddersk photochemistryofhclinraregasmatrices
AT schwentnern photochemistryofhclinraregasmatrices
first_indexed 2025-07-15T14:18:57Z
last_indexed 2025-07-15T14:18:57Z
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