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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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2000
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| Zitieren: | 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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nasplib_isofts_kiev_ua-123456789-1292142025-06-03T16:27:30Z 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 https://nasplib.isofts.kiev.ua/handle/123456789/129214 en Физика низких температур application/pdf 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 |
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 |
https://nasplib.isofts.kiev.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 |
2025-11-24T20:24:48Z |
| last_indexed |
2025-11-24T20:24:48Z |
| _version_ |
1849704724266221568 |
| fulltext |
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