Infrared absorption spectra of hot ammonia

Infrared absorption spectra of NH3 have been obtained at high resolution (0.02cm−1) at seven temperatures between 296 and 973K. The spectra were recorded using a Bruker IFS 125 infrared Fourier transform spectrometer in the 2400–5500cm−1 region and empirical lower state energies have been obtained b...

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Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 2017-12, Vol.203, p.410-416
Main Authors: Beale, Christopher A., Hargreaves, Robert J., Coles, Phillip, Tennyson, Jonathan, Bernath, Peter F.
Format: Article
Language:English
Subjects:
Brown dwarfs
Fourier transform spectroscopy
Hot ammonia
Infrared absorption
Line lists
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Summary:Infrared absorption spectra of NH3 have been obtained at high resolution (0.02cm−1) at seven temperatures between 296 and 973K. The spectra were recorded using a Bruker IFS 125 infrared Fourier transform spectrometer in the 2400–5500cm−1 region and empirical lower state energies have been obtained by comparison of line strengths at different temperatures. Using two reference line lists, quantum number assignments have been made for each temperature for between 1660 and 3020 transitions, with J up to 22. The line lists obtained provide accurate line positions as well as intensities and experimental lower state energies at temperatures relevant for modeling the atmospheres of brown dwarfs and exoplanets. •Fourier transform infrared absorption spectra of hot ammonia.•Line positions, empirical lower state energies and intensities measured.•Line lists for brown dwarf and exoplanet atmospheres.
ISSN:0022-4073
1879-1352
DOI:10.1016/j.jqsrt.2017.02.012