Researchers led by Prof. Zhang Weijun from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences have proposed a feasible approach for the rapid detection of hydroxyl radicals.
Based on this technology, a new device called Frequency-modulated Faraday Rotation spectrometer has been developed, which can detect OH radicals with high precision. The study was published inHydroxyl radicals are important active oxidants in the atmosphere and are important reaction chain initiators in the oxidation of most compounds. In order to study their reaction processes and mechanisms in detail, they must be measured directly in"real time," i.e.
To address this problem, the researchers developed the FM-FRS spectrometer for highly sensitive and rapid measurement of OH radicals, which was characterized by wide measurement bandwidth, high sensitivity, and good selectivity, and is particularly suitable for kinetic studies of short-lived intermediate radicals.
"We used a special laser beam that is modulated at a very high frequency, up to 150 million times per second," said Cheng Feihu, a member of the team. Concentration-time profile of OH radical obtained after averaging three pulses at a 200 μs sampling interval. Credit: Cheng Feihu The researchers used the spectroscopic technique to measure the time-resolved spectral signal of the OH
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