Abstract
The beam from a rapid-tuning single-frequency laser was used to probe the R1(7) and R1(11) A 2Σ+ ← X 2∏ (0, 0) line pair of OH at a 45° incident angle in a combustion-driven, supersonic free jet. Absorption line shapes were recorded in spatially resolved, single-point fluorescence. The Doppler shift, intensity ratio, and collisional broadening of the measured line pair were used to determine velocity, temperature, and pressure. The repetition rate of the measurement was 3 kHz.
© 1990 Optical Society of America
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