Comparison of temperature-dependent calibration methods of an instrument to measure OH and HO<sub>2</sub> radicals using laser-induced fluorescence spectroscopy

Abstract 2, following conversion to OH, over a wide variety of conditions, on different platforms and in simulation chambers. Conventional calibration of HOx (OH + 2) instruments has mainly relied on a single method, generating known concentrations of HOx from H2 O vapour photolysis in a flow of zero air impinging just outside the sample inlet (S HO x = C HO x x ], where S HO x C HO x x measurements in the Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) at the University of Leeds has been used to examine the sensitivity of FAGE to external gas temperatures (266–348 K). C OH (relative to the value at 293 K) of (0.0059 ± 0.0015) K- 1 C HO 2 0.014 ± 0.013) K- 1 σ C OH was also determined by observing the decay of hydrocarbons (typically cyclohexane) caused by OH reactions giving C OH 0.0038 ± 0.0007) K- 1 C HO 2 2 recombination with the temperature dependence of C HO 2 0.0064 ± 0.0034) K- 1 C HO x x number density, quenching, the relative population of the probed OH rotational level and HOx transmission from the inlet to the detection axis. The first three terms can be calculated and, in combination with the measured values of C HO x x transmission increases with temperature. Comparisons with other instruments and the implications of this work are discussed.

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch

Bibliographic citation
Comparison of temperature-dependent calibration methods of an instrument to measure OH and HO2 radicals using laser-induced fluorescence spectroscopy ; volume:16 ; number:19 ; year:2023 ; pages:4375-4390 ; extent:16
Atmospheric measurement techniques ; 16, Heft 19 (2023), 4375-4390 (gesamt 16)

Creator
Winiberg, Frank A. F.
Warman, William J.
Brumby, Charlotte A.
Boustead, Graham
Bejan, Iustinian G.
Speak, Thomas H.
Heard, Dwayne E.
Stone, Daniel
Seakins, Paul W.

DOI
10.5194/amt-16-4375-2023
URN
urn:nbn:de:101:1-2023101204362769414956
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
14.08.2025, 10:57 AM CEST

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Associated

  • Winiberg, Frank A. F.
  • Warman, William J.
  • Brumby, Charlotte A.
  • Boustead, Graham
  • Bejan, Iustinian G.
  • Speak, Thomas H.
  • Heard, Dwayne E.
  • Stone, Daniel
  • Seakins, Paul W.

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