Quantification of Nitric Acid Using Photolysis Induced Fluorescence for use in Chemical Kinetic Studies

Creators: Winiberg, Frank A. F.; Percival, Carl J.; Sander, Stanley P.

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Abstract

Previous laboratory investigations have predominantly relied on UV absorption measurement of [HNO_3]. Whilst direct, this measurement is difficult at temperatures <298 K, where heterogeneous loss to cold surfaces is significant. Single and two photon photodissociation of HNO_3 was studied in N_2 and He at 193 and 248 nm, and a unique HNO_3 detection method was established using two photons at 248 nm, with good reproducibility and limit of detection (∼1.25 × 10^(14) cm^(-3)). Emissions from excited products have been identified spectroscopically, over a range of pressures and laser energies to support the HNO_3 quantification method.

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© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/). Received 27 November 2018, Revised 19 March 2019, Accepted 20 March 2019, Available online 22 April 2019. The experimental research was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA), and was supported by the Upper Atmosphere Research Program. Frank Winiberg's research was supported by an appointment to the NASA Postdoctoral Program, administered by Universities Space Research Association under contract with NASA. Conflicts of Interest: There are no conflicts to declare.

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