Rahman K Arafat, Athmanathan Venkat, Slipchenko Mikhail N, Roy Sukesh, Gord James R, Zhang Zhili, Meyer Terrence R
Appl Opt. 2019 Mar 10;58(8):1984-1990. doi: 10.1364/AO.58.001984.
Quantitative femtosecond two-photon laser-induced fluorescence of atomic oxygen was demonstrated in an H/air flame at pressures up to 10 atm. Femtosecond excitation at 226.1 nm was used to pump the 3pP3←←2pP3 electronic transition of atomic oxygen. Contributions from multiphoton de-excitation, production of atomic oxygen, and photolytic interferences were investigated and minimized by limiting the laser irradiance to ∼10 W/cm. Quantitative agreement was achieved with the theoretical equilibrium mole fraction of atomic oxygen over a wide range of fuel-air ratios and pressures in an H/air laminar calibration burner.
在高达10个大气压的H/空气火焰中实现了对原子氧的定量飞秒双光子激光诱导荧光。利用226.1nm的飞秒激发光泵浦原子氧的3pP3←←2pP3电子跃迁。通过将激光辐照度限制在约10 W/cm，研究并最小化了多光子去激发、原子氧的产生以及光解干扰的影响。在H/空气层流校准燃烧器中，在广泛的燃料-空气比和压力范围内，实现了与原子氧理论平衡摩尔分数的定量一致。
