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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| Опубліковано в: : | Физика низких температур |
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| Дата: | 2000 |
| Автори: | , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2000
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/129214 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| 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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862542600692563968 |
|---|---|
| author | Miki, Masaaki Momose, Takamasa |
| author_facet | Miki, Masaaki Momose, Takamasa |
| 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. |
| collection | DSpace DC |
| container_title | 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.
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| first_indexed | 2025-11-24T20:24:48Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-129214 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-24T20:24:48Z |
| publishDate | 2000 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Miki, Masaaki Momose, Takamasa 2018-01-16T20:02:47Z 2018-01-16T20:02:47Z 2000 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 https://nasplib.isofts.kiev.ua/handle/123456789/129214 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. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Low-Temperature Physics and Chemistry in Cryomatrice Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals Article published earlier |
| spellingShingle | Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals Miki, Masaaki Momose, Takamasa Low-Temperature Physics and Chemistry in Cryomatrice |
| title | 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_short | Rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
| title_sort | rovibrational transitions and nuclear spin conversion of methane in parahydrogen crystals |
| topic | Low-Temperature Physics and Chemistry in Cryomatrice |
| topic_facet | Low-Temperature Physics and Chemistry in Cryomatrice |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/129214 |
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