ROTATIONAL LEVEL-DEPENDENT COLLISIONAL BROADENING AND LINE SHIFT OF THE A2-EPSILON+-X2-PI (1, 0) BAND OF OH IN HYDROGEN AIR COMBUSTION GASES

Measurements of the collisional broadening and line shift of the (1, 0) band of the A2SIGMA+-X2PI system of OH are reported in atmospheric pressure hydrogen-air combustion gases. The measurements were made using a single-mode, narrow linewidth, frequency-doubled ring dye laser operating near 283 nm. The OH was generated in the combustion gases of a flat flame H-2-air burner. Collisional broadening parameters for equilibrium mixtures of H-2, O2, H2O, and N2 were obtained spanning a range of fuel/air equivalence ratios from 0.6 to 1.6 and temperatures from 1500 to 2050 K. Measurements were obtained spanning rotational quantum numbers from J'' = 4.5 to 16.5. The collision induced frequency shift was determined to be 0.1 that of the collisional broadening.