Measurements of N-2-broadening and -shifting parameters of the water vapor spectral lines in the 19,560-19,920 cm(-1) region using FT-spectrometer with LED source

摘要

The water vapor line broadening and shifting coefficients for about 91 strongest water vapor lines in the 19,560-19,920 cm(-1) spectral region induced by nitrogen pressure are measured with a spectral resolution of 0.05 cm(-1) at room temperature by a Fourier transform spectrometer using high luminance LED light source. A high signal-to-noise ratio (S/N approximate to 10 000) allows one to analyze the lines with intensities from 1.54 x 10(-23) to 2.0 x 10(-26) cm/molecule. The multi-spectrum fitting procedure was used to fit line broadening and shift parameters of the 5 nu(1)+nu(3), and 6 nu(1) bands using the Voigt, Speed dependent Voigt and HTP profiles. Line width and shift values are calculated using a semi-empirical approach extended by the use of empirical data to determine some fitting model parameters. The method was further developed by using anharmonic wavefunctions in the estimates of line profile parameters. (C) 2019 Elsevier Ltd. All rights reserved.