Quantitative Emission And Absorption Spectrometry Of Hot Gases From Moderate Resolution Spectra

J. N. Sun; P. R. Griffiths

doi:10.1117/12.932173

29 October 1981 Quantitative Emission And Absorption Spectrometry Of Hot Gases From Moderate Resolution Spectra

J. N. Sun, P. R. Griffiths

Proceedings Volume 0289, 1981 Intl Conf on Fourier Transform Infrared Spectroscopy; (1981) https://doi.org/10.1117/12.932173
Event: 1981 International Conference on Fourier Transform Infrared Spectroscopy, 1981, Columbia, United States

Abstract

When spectra of simple gases are measured at moderate resolution, the rotational fine structure of bands may be resolved but the effect of convolving the true shape of each line with the instrument line shape (ILS) function of the spectrometer leads to decreased band intensity. We have studied the feasibility of fitting the peak intensities of lines in absorption and emission vibration-rotation spectra to theoretical values computed by convolving the true spectrum with the sinc² ILS function of an FT-IR spectrometer. Early work showed that absorption spectra of CO at room temperature gave an excellent fit but the fit became poorer at elevated temperature. Subsequent work has shown that part of the reason for this behavior was an inaccurate knowledge of the temperature dependence of collision-broadened line widths, and we will present more accurate data for self-broadened CO. The current state of this technique for determining the temperature and concentration of remote hot gases from FT-IR emission spectra will then be summarized.

Citation Download Citation

J. N. Sun and P. R. Griffiths "Quantitative Emission And Absorption Spectrometry Of Hot Gases From Moderate Resolution Spectra", Proc. SPIE 0289, 1981 Intl Conf on Fourier Transform Infrared Spectroscopy, (29 October 1981); https://doi.org/10.1117/12.932173

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