An airborne compatible photofragmentation two-photon laser-induced fluorescence instrument for measuring background tropospheric levels of NO, NO(x), and NO2
An airborne compatible photofragmentation two-photon laser-induced fluorescence instrument for measuring background tropospheric levels of NO, NO(x), and NO2
复制标题
机载兼容光碎裂双光子激光诱导荧光仪器，用于测量背景对流层 NO、NO(x) 和 NO2 水平
DOI：
10.1029/jd095id07p10155
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发表时间：
1990
影响因子：
--
通讯作者：
D. Davis
中科院分区：
文献类型：
--
作者：
S. Sandholm;J. Bradshaw;K. S. Dorris;M. Rodgers;D. Davis
据报道，一种光碎裂双光子激光诱导荧光 (PF/TP-LIF) 传感器具有同时测量 NO/NOx/NO2 的能力。该仪器技术基于通过 TP-LIF 方法直接光谱检测 NO。 NOx (NO+NO2) 以及随后的 NO2 的测量是通过 XeF 准分子激光器在 353 nm 处对 NO2 进行光断裂来完成的。然后使用 TP-LIF 技术定量检测所得的 NO 光碎片。当 NO2 光解池停留时间小于 0.5 秒时，NO2 的激光光解效率通常为 60%。所述 PF/TP-LIF 仪器的检测限 (S/N=2) 对于 NO（2 分钟积分时间）为 3.5 pptv，对于 NO2（6 分钟积分时间）为 10 pptv。对该系统中化学干扰的评估没有发现重大问题。讨论了 PF/TP-LIF 方法扩展到同时检测多个 NxOy 物种的情况。
Reported on is a photofragmentation two-photon laser-induced fluorescence (PF/TP-LIF) sensor with a demonstrated capability for making simultaneous measurements of NO/NOx/NO2. This instrumental technique is based on the direct spectroscopic detection of NO via the TP-LIF methodology. The measurement of NOx (NO+NO2), and subsequently NO2, is accomplished by the photofragmentation of NO2 at 353 nm via a XeF excimer laser. The resultant NO photofragment is then quantitatively detected using the TP-LIF technique. The laser photolysis efficiency for NO2 is typically 60% for NO2 photolysis cell residence times of less than 0.5 s. The limit of detection (S/N=2) for the described PF/TP-LIF instrument is 3.5 pptv for NO (2 min integration time) and 10 pptv for NO2 (6 min integration time). An assessment of chemical interferences in this system revealed no significant problems. The extension of the PF/TP-LIF methodology to the simultaneous detection of multiple NxOy, species is discussed.