We present chemical kinetics measurements of the luminol oxidation chemiluminescence (CL) reaction at the interface between two aqueous solutions, using liquid jet technology. Free-flowing liquid microjets are a relatively recent development that have found their way into a growing number of applications in spectroscopy and dynamics. A variant thereof, called flat-jet, is obtained when two cylindrical jets of a liquid are crossed, leading to a chain of planar leaf-shaped structures of the flowing liquid. We here show that in the first leaf of this chain, the fluids do not exhibit turbulent mixing, providing a clean interface between the liquids from the impinging jets. We also show, using the example of the luminol CL reaction, how this setup can be used to obtain kinetics information from friction-less flow and by circumventing the requirement for rapid mixing by intentionally suppressing all turbulent mixing and instead relying on diffusion.

Department of Chemistry University of Southern California Los Angeles California 90089 0482 United States

Fritz Haber Institut der Max Planck Gesellschaft Faradayweg 4 6 14195 Berlin Germany

Institut für Physik und CINSaT Universität Kassel Heinrich Plett Straße 40 34132 Kassel Germany

Institute for Chemical Sciences and Engineering 1015 Lausanne Switzerland

Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo nám 2 16610 Prague 6 Czech Republic

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