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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 11
Atmos. Meas. Tech., 7, 3839–3847, 2014
https://doi.org/10.5194/amt-7-3839-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 7, 3839–3847, 2014
https://doi.org/10.5194/amt-7-3839-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 19 Nov 2014

Research article | 19 Nov 2014

Quantitative infrared absorption cross sections of isoprene for atmospheric measurements

C. S. Brauer1, T. A. Blake1, A. B. Guenther2, S. W. Sharpe3, R. L. Sams1, and T. J. Johnson1 C. S. Brauer et al.
  • 1Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
  • 2Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
  • 3Signature Science and Technology Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA

Abstract. Isoprene (C5H8, 2-methyl-1,3-butadiene) is a volatile organic compound (VOC) and is one of the primary contributors to annual global VOC emissions. Isoprene is produced primarily by vegetation as well as anthropogenic sources, and its OH- and O3-initiated oxidations are a major source of atmospheric oxygenated organics. Few quantitative infrared studies have been reported for isoprene, limiting the ability to quantify isoprene emissions via remote or in situ infrared detection. We thus report absorption cross sections and integrated band intensities for isoprene in the 600–6500 cm−1 region. The pressure-broadened (1 atmosphere N2) spectra were recorded at 278, 298, and 323 K in a 19.94 cm path-length cell at 0.112 cm−1 resolution, using a Bruker IFS 66v/S Fourier transform infrared (FTIR) spectrometer. Composite spectra are derived from a minimum of seven isoprene sample pressures, each at one of three temperatures, and the number densities are normalized to 296 K and 1 atm.

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