Best pair of 3.3-μm-band transitions for isotopomer abundance ratio measurements of13CH4 to12CH4

Kenji Anzai; Hiroyuki Sasada; Naohiro Yoshida

doi:10.1143/JJAP.46.1717

Best pair of 3.3-μm-band transitions for isotopomer abundance ratio measurements of¹³CH₄ to¹²CH₄

Kenji Anzai, Hiroyuki Sasada, Naohiro Yoshida

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

To determine the isotopomer abundance ratio of ¹³CH₄ to ¹²CH₄ by infrared absorption spectroscopy, we selected the v₃ P(6) A₁ transition of ¹³CH₄ at 2947.6970cm^-1 and the V₂+ V₄ R(6) F ₁ transition of ¹²CH₄ at 2947.4246cm ^-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%.

Original language	English
Pages (from-to)	1717-1721
Number of pages	5
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	46
Issue number	4 A
DOIs	https://doi.org/10.1143/JJAP.46.1717
Publication status	Published - 2007 Apr 5
Externally published	Yes

Keywords

Absorption spectroscopy
Difference frequency generation
Isotope analysis
Methane
Mid-infrared

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.46.1717

Cite this

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title = "Best pair of 3.3-μm-band transitions for isotopomer abundance ratio measurements of13CH4 to12CH4",

abstract = "To determine the isotopomer abundance ratio of 13CH4 to 12CH4 by infrared absorption spectroscopy, we selected the v3 P(6) A1 transition of 13CH4 at 2947.6970cm-1 and the V2+ V4 R(6) F 1 transition of 12CH4 at 2947.4246cm -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%.",

keywords = "Absorption spectroscopy, Difference frequency generation, Isotope analysis, Methane, Mid-infrared",

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TY - JOUR

T1 - Best pair of 3.3-μm-band transitions for isotopomer abundance ratio measurements of13CH4 to12CH4

AU - Anzai, Kenji

AU - Sasada, Hiroyuki

AU - Yoshida, Naohiro

PY - 2007/4/5

Y1 - 2007/4/5

N2 - To determine the isotopomer abundance ratio of 13CH4 to 12CH4 by infrared absorption spectroscopy, we selected the v3 P(6) A1 transition of 13CH4 at 2947.6970cm-1 and the V2+ V4 R(6) F 1 transition of 12CH4 at 2947.4246cm -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%.

AB - To determine the isotopomer abundance ratio of 13CH4 to 12CH4 by infrared absorption spectroscopy, we selected the v3 P(6) A1 transition of 13CH4 at 2947.6970cm-1 and the V2+ V4 R(6) F 1 transition of 12CH4 at 2947.4246cm -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%.

KW - Absorption spectroscopy

KW - Difference frequency generation

KW - Isotope analysis

KW - Methane

KW - Mid-infrared

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