Line parameter measurements and calculations of CO broadened by H 2O and CO 2 at elevated temperatures

Abstract

Measurements of collisional broadening of four fundamental CO lines in atmospheres of CO 2 and H 2O at 300–600 K were made. The Voigt line-shape model was fitted parametrically to the absorption spectra line-shapes. The results are compared with other experimental studies and with theoretical calculations for CO 2 broadening. Absorption spectra of the exhaust gases of a flat flame were recorded and analyzed to yield CO concentration, temperature, and line half-widths. The flame spectra half-widths were compared with extrapolations of lower temperature data using the simple power law approximation γ(T)=γ(T 0) ( T 0 T ) n . The utility of this approximation in the development of combustion diagnostic techniques is discussed.