Abstract
The self-broadening coefficients and intensities of approximately 460 of the strongest water vapour lines (intensity S ⩾ 1.5 × 10 −23 cm molec −1) in the spectral region 5000–5600 cm −1 have been derived from new laboratory measurements. The derived line intensities are on average in a good agreement with those in HITRAN-2001 (v.11.0) (within 0.5% for total band intensity). Self-broadening coefficients are compared with values estimated from the HITRAN-2001 foreign-broadening coefficients. Comparison has been also made with the recent HITRAN-2004 (v.12.0) compilation, which revealed marked systematic differences in the self-broadening coefficients (up to 20%) and in the line intensities (up to 5%). The possible reasons for these deviations are discussed.
Highlights
The HITRAN database of spectral lines parameters is an important component of many atmospheric and spectroscopic applications [1]
In most cases there was found to be a good agreement between fitted parameters and those in HITRAN-2001
And 5 the ratios of fitted and HITRAN-2001 line parameters are shown in panel (b) as a function of wavenumber and in (c) as a function of line intensity
Summary
The HITRAN database of spectral lines parameters is an important component of many atmospheric and spectroscopic applications [1]. It contains parameters of more than 1 million spectral lines and is regularly updated with line parameters derived from new laboratory measurements and theoretical calculations. In our recent laboratory investigations, devoted to the detection of water dimer in pure vapour samples [2], it was necessary to know the self-broadened halfwidth of the water vapour spectral lines in the spectral region 5000-5600 cm-1. The origin of the HITRAN-2001 update of H2O line parameters in this spectral region is described by Toth [3]. This paper presents the results of deriving these parameters from line fitting to pure water vapour spectra, obtained at the Molecular Spectroscopy Facility at the Rutherford Appleton Laboratory using a high-resolution Fourier transform spectrometer
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