Multispectrum fitting technique for data recorded by Fourier transform spectrometer:: application to N2O and CH3D

To improve the fit of spectroscopic parameters recorded by Fourier transform spectrometer (intensities, broadening coefficients, and pressure shift), we have developed a multispectrum fitting technique, this technique being already described by other research groups (Benner DC, Rinsland CP, Malathy Devi V, Smith MAH, Atkins D. JQSRT 1995;53:705; Carlotti, Appl Opt 1988;27:3250). We describe the algorithm of the software allowing to analyse and visualise several spectra simultaneously. To validate our software, line intensities (for N2O and CH3D) and self-broadening coefficients were fitted and compared with previous studies. We have also studied the wave numbers of N2O and compared them with heterodyne measurements in order to estimate the relative accuracy of our results. (C) 2001 Elsevier Science Ltd. All rights reserved.