Abstract
A variable temperature photoacoustic cell has been constructed and tested by studying the interplay of CO2, H2O, and NH3 in synthetic smoke. Saturation effects for CO2 and NH3 have been modeled and compared with experiments, and results are obtained for the vibrational relaxation rate associated with NH3-H2O collisions. The cell has been used for studying the temperature dependence of self-broadening and N2 broadening of CO2 lines. The temperature dependence of the scattering rate is well described by a T −n law with n=0.77 in both cases. This result agrees with previous results obtained by tunable diode laser spectroscopy, but disagrees with results obtained by indirect methods.
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Supported by the Danish Science Research Council under grant no. 11-7777, and by FLS-airloq A/S
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Hammerich, M., Vildrik-Sørensen, L., de Vries, H. et al. Photoacoustic measurements of Lorentz broadening in CO2 between 25° C and 450° C. Appl. Phys. B 53, 170–179 (1991). https://doi.org/10.1007/BF00330233
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DOI: https://doi.org/10.1007/BF00330233