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- W4242029503 abstract "Abstract. The hydroxyl free radical (OH) is the major oxidizing species in the lower atmosphere. Measuring the OH concentration is generally difficult and involves elaborate, expensive, custom-made experimental setups. Thus other more economical techniques, capable of determining OH concentrations at environmental chambers, would be valuable. This work is based on an indirect method of OH concentration measurement, by monitoring an appropriate OH tracer by proton transfer reaction mass spectrometry (PTR-MS). 3-pentanol, 3-pentanone and pinonaldehyde (PA) were used as OH tracers in α-pinene (AP) secondary organic aerosol (SOA) aging studies. In addition we tested butanol-d9 as potential universal OH tracer and determined its reaction rate constant with OH: kbutanol-d9 = 3.4(±0.88) · 10−12 cm3molecule−1s−1. In order to make the chamber studies more comparable among each other as well as to atmospheric measurements we suggest the use of a chemical (time) dimension:~the OH clock, which corresponds to the integrated OH concentration over time." @default.
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- W4242029503 date "2011-12-15" @default.
- W4242029503 modified "2023-10-01" @default.
- W4242029503 title "OH clock determination by proton transfer reaction mass spectrometry at an environmental chamber" @default.
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- W4242029503 doi "https://doi.org/10.5194/amtd-4-7471-2011" @default.
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