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Published in

Elsevier, Journal of Quantitative Spectroscopy and Radiative Transfer, 1-4(82), p. 279-292, 2003

DOI: 10.1016/s0022-4073(03)00158-4

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Hot methane spectra for astrophysical applications

Journal article published in 2003 by Ray Nassar ORCID, Peter Bernath
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

We have recorded laboratory high resolution Fourier transform spectra of methane (CH4) emission at 800, 1000 and with an effective hot path length of . The spectra span 2000– (resolution , nominal pressure ) and 5000– (resolution , nominal pressure for each temperature. We have determined line positions and intensities for 15 434, 22 163 and 25 727 emission lines in the 800, 1000 and spectra, respectively. Positions have been calibrated to a 1σ accuracy of better than in the 2000– spectra and in the 5000– spectra based on the 2001 methane line list update in the HITRAN database. We have calculated absolute line intensity calibration factors for these lines based on HITRAN intensities scaled to the appropriate temperature. In addition, since some methane lines in our spectra appeared in absorption, we have directly used intensities calculated from HITRAN for 757, 839 and 1094 additional lines in the 800, 1000 and spectra, respectively. We expect our new hot methane line lists to be useful for direct comparison and simulation of the spectral energy distribution from brown dwarfs and hot extrasolar giant planets, and may also be used for comparison with line lists generated by both ab initio quantum chemists and more traditional theoretical spectroscopists. Furthermore, the method we have developed for obtaining high temperature line lists can be applied to other molecules in the HITRAN database.