Issue 3
Mar 2021
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Tan Yan-dong, Cheng Cun-feng, Sheng Dong, Hu Shui-ming. Detection of Radiocarbon Dioxide with Double-Resonance Absorption Spectroscopy[J]. JOURNAL OF MECHANICAL ENGINEERING, 2021, 34(3): 373-380. doi: 10.1063/1674-0068/cjcp2103045
Citation: Tan Yan-dong, Cheng Cun-feng, Sheng Dong, Hu Shui-ming. Detection of Radiocarbon Dioxide with Double-Resonance Absorption Spectroscopy[J]. JOURNAL OF MECHANICAL ENGINEERING, 2021, 34(3): 373-380. doi: 10.1063/1674-0068/cjcp2103045

Detection of Radiocarbon Dioxide with Double-Resonance Absorption Spectroscopy

doi: 10.1063/1674-0068/cjcp2103045
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  • Corresponding author: Shui-ming Hu, E-mail: smhu@ustc.edu.cn
  • Received Date: 15 Mar 2021
  • Accepted Date: 12 Apr 2021
  • Available Online: 07 Sep 2021
  • Issue Publish Date: 27 Aug 2021
  • Fast and accurate quantitative detection of 14CO2 has important applications in many fields. The optical detection method based on the sensitive cavity ring-down spectroscopy technology has great potential. But currently it has difficulties of insufficient sensitivity and susceptibility to absorption of other isotopes/impurity molecules. We propose a stepped double-resonance spectroscopy method to excite 14CO2 molecules to an intermediate vibrationally excited state, and use cavity ring-down spectroscopy to probe them. The two-photon process significantly improves the selectivity of detection. We derive the quantitative measurement capability of double-resonance absorption spectroscopy. The simulation results show that the double-resonance spectroscopy measurement is Doppler-free, thereby reducing the effect of other molecular absorption. It is expected that this method can achieve high-selectivity detection of 14CO2 at the sub-ppt level.

     

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