Best Pair of 3.3-μm-Band Transitions for Isotopomer Abundance Ratio Measurements of 13CH4 to 12CH4
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概要
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To determine the isotopomer abundance ratio of 13CH4 to 12CH4 by infrared absorption spectroscopy, we selected the $\nu_{3}$ P(6) A1 transition of 13CH4 at 2947.6970 cm-1 and the $\nu_{2}+\nu_{4}$ R(6) F1 transition of 12CH4 at 2947.4246 cm-1, which simultaneously satisfy six necessary and desirable conditions, including the higher absorption intensity for the less abundant species, no overlapping with other spectral lines, and small temperature dependence. Then, from the recorded spectra of these transitions using a widely tunable spectrometer based on a difference-frequency-generation light source, we determined the absorption coefficient ratio from the individual absorbance with a precision of 0.3%.
- 2007-04-15
著者
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Yoshida Naohiro
Departement Of Cardiology Kanazawa Cardiovascular Hospital
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Anzai Kenji
Department Of Physics Faculty Of Science And Technology Keio University
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Sasada Hiroyuki
Department Of Physics Faculty Of Science And Technology Keio University
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Yoshida Naohiro
Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Anzai Kenji
Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Sasada Hiroyuki
Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Anzai Kenji
Department of Chemical Engineering, Shizuoka University
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