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• W2321937172 abstract "A new method for measuring gas-phase and aerosol reaction kinetics is described in which the gas flow, itself, acts as a virtual injector continuously increasing the contact time in analogy to conventional movable-injector kinetics techniques. In this method a laser is directed down the length of a flow tube, instantly initiating reaction by photodissociation of a precursor species at every point throughout the flow tube. Key tropospheric reactants such as OH, Cl, NO(3), and O(3) can be generated with nearly uniform concentrations along the length of the flow tube in this manner using 355 nm radiation from the third harmonic of a Nd:YAG laser. As the flow travels down the flow tube, both the gas-phase and particle-phase species react with the photogenerated radicals or O(3) for increasingly longer time before exiting and being detected. The advantages of this method are that (1) any wall loss of gas-phase and particle species is automatically accounted for, (2) the reactions are conducted under nearly pseudo-first-order conditions, (3) the progress of the reaction is followed as a continuous function of reaction time instead of reactant concentration, (4) data collection is quick with an entire decay trace being collected in as little as 1 min, (5) relative rates of several species can be measured simultaneously, and (6) bimolecular rate constants at least as small as k = 10(-17) (cm(3)/molecule)/s, or aerosol uptake coefficients at least as small as γ = 10(-4), can be measured. Using the virtual injector technique with an aerosol chemical ionization mass spectrometer (CIMS) as a detector, examples of gas-phase relative rates and uptake by oleic acid particles are given for OH, Cl, NO(3), and O(3) reactions with most agreeing to within 20% of published values, where available." @default.
• W2321937172 created "2016-06-24" @default.
• W2321937172 creator A5022742013 @default.
• W2321937172 creator A5023712736 @default.
• W2321937172 date "2012-06-15" @default.
• W2321937172 modified "2023-10-12" @default.
• W2321937172 title "“Virtual Injector” Flow Tube Method for Measuring Relative Rates Kinetics of Gas-Phase and Aerosol Species" @default.
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• W2321937172 doi "https://doi.org/10.1021/jp303221w" @default.
• W2321937172 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22702447" @default.
• W2321937172 hasPublicationYear "2012" @default.
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