Voigt deconvolution method and its applications to pure oxygen absorption spectrum at 1270 nm band

• data analysis was analyzed by Voigt deconvolution method.
• each spectral line consists of a superposition of two bands.
• Competition between the Gaussian and the Lorentzian width was evident in figures (5,6,7).
• The width ratio () reveals the issue of competition between thermal and collisional effects.
• Voigt FWHM was always a linear function with the pressure at 298 K, 323 k and 348 K, but at 373 K does not.

Experimental spectral lines of pure oxygen at 1270 nm band were analyzed by Voigt deconvolution method. The method gave a total Voigt profile, which arises from two overlapping bands. Deconvolution of total Voigt profile leads to two Voigt profiles, the first as a result of O2 dimol at 1264 nm band envelope, and the second from O2 monomer at 1268 nm band envelope. In addition, Voigt profile itself is the convolution of Lorentzian and Gaussian distributions. Competition between thermal and collisional effects was clearly observed through competition between Gaussian and Lorentzian width for each band envelope. Voigt full width at half-maximum height (Voigt FWHM) for each line, and the width ratio between Lorentzian and Gaussian width (ΓLΓG− 1) have been investigated. The following applied pressures were at 1, 2, 3, 4, 5, and 8 bar, while the temperatures were at 298 K, 323 K, 348 K, and 373 K range.

The first figure from Figure (2): Voigt deconvolution at 323 K.Figure optionsDownload as PowerPoint slide