Nuclear spin conversion of methane in solid parahydrogen.

Nuclear spin conversion of methane in solid parahydrogen. Research Abstract Details 

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Nuclear spin conversion of methane in solid parahydrogen. Abstract Text:

Yuki Miyamoto,Mizuho Fushitani,Daisuke Ando,Takamasa Momose,

The nuclear spin conversion of CH(4) and CD(4) isolated in solid parahydrogen was investigated by high resolution Fourier transform infrared spectroscopy. From the analysis of the temporal changes of rovibrational absorption spectra, the nuclear spin conversion rates associated with the rotational relaxation from the J=1 state to the J=0 state for both species were determined at temperatures between 1 and 6 K. The conversion rate of CD(4) was found to be 2-100 times faster than that of CH(4) in this temperature range. The faster conversion in CD(4) is attributed to the quadrupole interaction of D atoms in CD(4), while the conversion in CH(4) takes place mainly through the nuclear spin-nuclear spin interaction. The conversion rates depend on crystal temperature strongly above 3.5 K for CH(4) and above 2 K for CD(4), while the rates were almost constant below these temperatures. The temperature dependence indicates that the one-phonon process is dominant at low temperatures, while two-phonon processes become important at higher temperatures as a cause of the nuclear spin conversion.

Nuclear spin conversion of methane in solid parahydrogen. Publishing Authors By Initials

Y Miyamoto,M Fushitani,D Ando,T Momose,

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Nuclear spin conversion of methane in solid parahydrogen. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of chemical physics

VOLUME: 128

Page Numbers: 114502

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ISSN: 0021-9606

DAY: 21

MONTH: Mar

YEAR: 2008

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LANGUAGE: eng

NlmUniqueID: 375360

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Grant and Affiliation Information for Nuclear spin conversion of methane in solid parahydrogen.

AFFILIATION: Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, JapanDepartment of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.

Country: United States

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MEDLINETA: J Chem Phys

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