High-resolution absorption measurements of NH3 at high temperatures: 500–2100cm−1

Emma J. Barton, Sergei N. Yurchenko, Jonathan Tennyson, Sønnik Clausen, Alexander Fateev

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Abstract

High-resolution absorption spectra of NH3 in the region 500–2100 cm -1 at temperatures up to1027 1C and approximately atmospheric pressure (1013±20 mbar) are measured. NH3 concentrations of 1000 ppm,0.5% and 1% in volume fraction were used in the measurements. Spectra are recorded in high temperature gas flow cells using a FourierTransform Infrared (FTIR) spectrometer at a nominal resolution of 0.09cm-1. Measurements at 22.7 °C are compared to high-resolution cross sections available from thePacific Northwest National Laboratory (PNNL). The higher temperature spectra are analysed by comparison to a variational line list, BYTe, and experimental energy levels determined using the MARVEL procedure. Approximately 2000 lines have been assigned, of which 851are newly assigned to mainly hot bands involving vibrational states as high as v2=5.
Original languageEnglish
JournalJournal of Quantitative Spectroscopy & Radiative Transfer
Volume167
Pages (from-to)126-134
ISSN0022-4073
DOIs
Publication statusPublished - 2015

Keywords

  • High temperature
  • Ammonia
  • Absorption
  • FTIR spectroscopy
  • High-temperature flow gas cell
  • Line assignments

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