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Yandong Tan, Cunfeng Cheng, Dong Sheng, Shuiming Hu. Detection of radiocarbon dioxide with double-resonance absorption spectroscopy[J]. Chinese Journal of Chemical Physics .
Citation: Yandong Tan, Cunfeng Cheng, Dong Sheng, Shuiming Hu. Detection of radiocarbon dioxide with double-resonance absorption spectroscopy[J]. Chinese Journal of Chemical Physics .

Detection of radiocarbon dioxide with double-resonance absorption spectroscopy

  • Received Date: 2021-03-15
  • Accepted Date: 2021-04-12
  • Rev Recd Date: 2021-04-12
  • Available Online: 2021-05-20
  • Fast and accurate quantitative detection of $^{14}$CO$_2$ 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 $^{14}$CO$_2$ 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 derived 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 $^{14}$CO$_2$ at the sub-ppt level.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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