C2H2 Overtones Near 12300 cm-1 Revisited with a Very Sensitive Cavity Ring-down Spectrometer

Bo Gao; An-wen Liu; Rui-xue Wu; Wei Ning; Shui-ming Hu

doi:10.1088/1674-0068/22/06/663-667

Bo Gao, An-wen Liu, Rui-xue Wu, Wei Ning, Shui-ming Hu. C2H2 Overtones Near 12300 cm-1 Revisited with a Very Sensitive Cavity Ring-down Spectrometer[J]. Chinese Journal of Chemical Physics , 2009, 22(6): 663-667. DOI: 10.1088/1674-0068/22/06/663-667

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C₂H₂ Overtones Near 12300 cm^-1 Revisited with a Very Sensitive Cavity Ring-down Spectrometer

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A cavity ring-down spectrometer (CRDS) is constructed with a single-mode continuous-waveTi:Sapphire laser. It allows attaining a minimum detectable absorption of 1.8×10^-10 cm^{-1.The spectrometer is applied to record the overtone spectrum of ¹²C₂H₂ in the 12240-12350 cm^-1. Compared with the previous CRDS and intra-cavity laser absorption spec-troscopy studies in the same region, the present measurement achieved better sensitivity and better precision as well. As a result, the ro-vibrational parameters of the high overtone bands of acetylene at 12290.12, 12311.82, and 12350.61 cm^-1 have been refined. The advantages of the present CRD spectrometer is also demonstrated by the newly observed and well characterized perturbation on the f component of the very weak band near 12289 cm^-1. The quantitative measurement capability of the spectrometer is verified with the measurement of the water lines and employed to give the absolute band intensities of those three acetylene bands.}

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C2H2 Overtones Near 12300 cm-1 Revisited with a Very Sensitive Cavity Ring-down Spectrometer

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C₂H₂ Overtones Near 12300 cm^-1 Revisited with a Very Sensitive Cavity Ring-down Spectrometer