Citation: HU Xiao, NI Shi-Chuan, YANG Na-Na, WANG Chun-Hui, WEI Na-Na, FANG Bo, LIU Dong-Yuan, ZHAO Wei-Xiong, ZHANG Wei-Jun. A Cavity Ring-down Spectrum Instrument for Analysis of HO₂ Radical Spectroscopy and Kinetics[J]. Chinese Journal of Analytical Chemistry, ;2023, 51(6): 994-1002. doi: 10.19756/j.issn.0253-3820.231062 shu

A Cavity Ring-down Spectrum Instrument for Analysis of HO₂ Radical Spectroscopy and Kinetics

HU Xiao ^1,2 ,
NI Shi-Chuan ^1,2 ,
YANG Na-Na ¹ ,
WANG Chun-Hui ³ ,
WEI Na-Na ¹ ,
FANG Bo ¹ ,
LIU Dong-Yuan ^1,2 ,
ZHAO Wei-Xiong ^1,, ,
ZHANG Wei-Jun ^1,3

1.
Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2.
Science Island Branch, Graduate School, University of Science and Technology of China, Hefei 230026, China;
3.
School of Environmental Science and Optoelectronics Technology, University of Science and Technology of China, Hefei 230026, China

Corresponding author: ZHAO Wei-Xiong, wxzhao@aiofm.ac.cn
Received Date: 21 February 2023
Revised Date: 19 April 2023

Fund Project: Supported by the National Natural Science Foundation of China (Nos. U21A2028, 42022051), the Youth Innovation Promotion Association, CAS (No. Y202089) and the CASHIPS Director′s Fund (No. YZJJ202101).

A new experimental set-up for highly sensitive detection of transient radicals was established based on cavity ring-down spectroscopy (CRDS) combined with flash photolysis. The mode coupling between the laser and the cavity was achieved by scanning the cavity length of the self-designed optical resonant cavity, and the ringdown time was obtained by fitting the decay curve based on the linear regression summation (LRS) algorithm. The minimum detectable absorption of the system of 5.05×10^-11 cm^-1 was achieved with effective optical path of 20.3 km and acquiring time of 6.25 s. HO₂ radicals were generated by using a 266 nm Nd∶YAG laser photolysis of O₃/C₂H₂ mixtures. The characteristic absorption of HO₂ radicals at 6638.203 cm^-1 was measured, and the absorption spectrum with a resolution of 0.002 cm^-1 was obtained. Under the condition of 2 kPa, the absorption cross section of HO₂ radicals at 6638.203 cm^-1 was 3.3×10^-19 cm²/molecule by measuring the decay of the HO₂ radicals self-reaction, and the corresponding absorption line strength was 6.02×10^-21 cm^-1/(molecule/cm²).
- Cavity ring-down spectroscopy,
- Laser-flash photolysis,
- Hydroperoxyl radical,
- Absorption cross section
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A Cavity Ring-down Spectrum Instrument for Analysis of HO₂ Radical Spectroscopy and Kinetics