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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*
Author NameAffiliationE-mail
Bo Gao Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
An-wen Liu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Rui-xue Wu Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Wei Ning Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Shui-ming Hu* Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China smhu@ustc.edu.cn 
Abstract:
A cavity ring-down spectrometer (CRDS) is constructed with a single-mode continuous-wave Ti: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.
Key words:  Near-IR, Cavity ring-down, C2H2, Overtone spectrum
FundProject:
C2H2 Overtones Near 12300 cm-1 Revisited with a Very Sensitive Cavity Ring-down Spectrometer
高波,刘安雯,吴瑞雪,宁威,胡水明*
摘要:
利用单模连续的钛宝石激光器, 构建了一台光腔衰荡光谱仪, 其可探测的最小吸收可达1.8×10-10/cm. 该光谱仪被用来记录C2H2分子在12240~12350 cm-1的泛频光谱. 与在同一波段测量的已报到的CRDS和激光腔内吸收光谱仪结果比较,本测量同时具有更好的灵敏度和精度. 由此,获得了乙炔分子在12290.12、12311.82和12350.61 cm-1附近高泛频谱带更准确的振转参数
关键词:  光腔衰荡,乙炔,近红外,泛频光谱
DOI:10.1088/1674-0068/22/06/663-667
分类号: