Rotational level dependence of ground state recovery rates for OH X 2Π(v″=0) in atmospheric pressure flames using the picosecond saturating-pump degenerate four-wave mixing probe technique

摘要: We report the first direct measurement of rotational level dependency rate recovery initially depleted levels in electronic ground state X 2Π(v″=0) OH produced different flame environments at atmospheric pressure. The initial depopulation a specific is accomplished by an intense picosecond pump pulse 308 nm to partially saturate A 2Σ–X 2Π(0,0) transition. population then monitored probing same via (1,0) band 283 using degenerate four-wave mixing (DFWM). Both laser wavelengths were derived from pulse-amplified and frequency doubled output two independently tunable distributed feedback dye lasers operated with Rh101 Rh6G ethanol, respectively, pumped second harmonic ps-Nd:YAG laser. It shown that repopulation decreases 54% 50% increasing quantu...