Fast and accurate quantitative detection of ^(14)CO_(2) has impor-tant applications in many elds.The optical detection method based on the sensitive cavity ring-down spectroscopy technol-ogy has great potential.But cu...Fast and accurate quantitative detection of ^(14)CO_(2) has impor-tant applications in many elds.The optical detection method based on the sensitive cavity ring-down spectroscopy technol-ogy has great potential.But currently it has diffculties of insuffcient 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 signi cantly 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 e ect of other molecular absorption.It is expected that this method can achieve high-selectivity detection of ^(14)CO_(2) at the sub-ppt level.展开更多
基金This work was jointly supported by the National Natural Science Foundation of China(No.22241302,No.22373002,No.12393825,No.11974328)the Chinese Academy of Science(No.YSBR-055)the Anhui Provincial Leading Talents Project.
基金This work was jointly supported by the National Natural Science Foundation of China(No.21688102 and No.11974328)the Chinese Academy of Sci-ences(XDB21020100 and XDC07010000)An-hui Initiative in Quantum Information Technologies(AHY110000).
文摘Fast and accurate quantitative detection of ^(14)CO_(2) has impor-tant applications in many elds.The optical detection method based on the sensitive cavity ring-down spectroscopy technol-ogy has great potential.But currently it has diffculties of insuffcient 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 signi cantly 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 e ect of other molecular absorption.It is expected that this method can achieve high-selectivity detection of ^(14)CO_(2) at the sub-ppt level.
