Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals
Solid parahydrogen is an excellent matrix for matrix-isolation spectroscopy because of its high spectral resolution. Here we describe the rovibrational structure and nuclear spin conversion of CH₄ embedded in parahydrogen crystals studied by infrared absorption spectroscopy. The vibration–rotation a...
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Дата: | 2000 |
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Формат: | Стаття |
Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2000
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Назва видання: | Физика низких температур |
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Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/129214 |
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Цитувати: | Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals / Masaaki Miki, Takamasa Momose // Физика низких температур. — 2000. — Т. 26, № 9-10. — С. 899-908. — Бібліогр.: 52 назв. — англ. |
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irk-123456789-1292142018-01-17T03:04:55Z Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals Miki, Masaaki Momose, Takamasa Low-Temperature Physics and Chemistry in Cryomatrice Solid parahydrogen is an excellent matrix for matrix-isolation spectroscopy because of its high spectral resolution. Here we describe the rovibrational structure and nuclear spin conversion of CH₄ embedded in parahydrogen crystals studied by infrared absorption spectroscopy. The vibration–rotation absorptions of CH₄ exhibit time-dependent intensity changes at 4.8 K. These changes are interpreted to be a result of the I=1→I=2 nuclear spin conversion that accompanies the J=1→J=0 rotational relaxation. The half-lifetime of the upper J=1 rotational state is unchanged by the addition of up to 2% orthohydrogen molecules but decreases with more than 10% orthohydrogen molecules. The increase of the decay rate at higher orthohydrogen concentration indicates that the magnetic field gradient across CH₄ due to the orthohydrogen molecules mixes the nuclear spin states, which accelerates the conversion. 2000 Article Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals / Masaaki Miki, Takamasa Momose // Физика низких температур. — 2000. — Т. 26, № 9-10. — С. 899-908. — Бібліогр.: 52 назв. — англ. 0132-6414 PACS: 33.20.Ea, 33.70.-w, 82.20.Rp http://dspace.nbuv.gov.ua/handle/123456789/129214 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
collection |
DSpace DC |
language |
English |
topic |
Low-Temperature Physics and Chemistry in Cryomatrice Low-Temperature Physics and Chemistry in Cryomatrice |
spellingShingle |
Low-Temperature Physics and Chemistry in Cryomatrice Low-Temperature Physics and Chemistry in Cryomatrice Miki, Masaaki Momose, Takamasa Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals Физика низких температур |
description |
Solid parahydrogen is an excellent matrix for matrix-isolation spectroscopy because of its high spectral resolution. Here we describe the rovibrational structure and nuclear spin conversion of CH₄ embedded in parahydrogen crystals studied by infrared absorption spectroscopy. The vibration–rotation absorptions of CH₄ exhibit time-dependent intensity changes at 4.8 K. These changes are interpreted to be a result of the I=1→I=2 nuclear spin conversion that accompanies the J=1→J=0 rotational relaxation. The half-lifetime of the upper J=1 rotational state is unchanged by the addition of up to 2% orthohydrogen molecules but decreases with more than 10% orthohydrogen molecules. The increase of the decay rate at higher orthohydrogen concentration indicates that the magnetic field gradient across CH₄ due to the orthohydrogen molecules mixes the nuclear spin states, which accelerates the conversion. |
format |
Article |
author |
Miki, Masaaki Momose, Takamasa |
author_facet |
Miki, Masaaki Momose, Takamasa |
author_sort |
Miki, Masaaki |
title |
Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
title_short |
Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
title_full |
Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
title_fullStr |
Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
title_full_unstemmed |
Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
title_sort |
rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
publishDate |
2000 |
topic_facet |
Low-Temperature Physics and Chemistry in Cryomatrice |
url |
http://dspace.nbuv.gov.ua/handle/123456789/129214 |
citation_txt |
Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals / Masaaki Miki, Takamasa Momose // Физика низких температур. — 2000. — Т. 26, № 9-10. — С. 899-908. — Бібліогр.: 52 назв. — англ. |
series |
Физика низких температур |
work_keys_str_mv |
AT mikimasaaki rovibrationaltransitionsandnuclearspinconversionofmethaneinparahydrogencrystals AT momosetakamasa rovibrationaltransitionsandnuclearspinconversionofmethaneinparahydrogencrystals |
first_indexed |
2023-10-18T20:57:10Z |
last_indexed |
2023-10-18T20:57:10Z |
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1796151537570938880 |