Laser-induced fluorescence based detection system for measurement of tropospheric OH using 308 nm excitation at low pressure
作者： Andreas Hofzumahaus , Frank Holland
DOI: 10.1117/12.140228
关键词: Photomultiplier 、 Detection limit 、 Resonance fluorescence 、 Optoelectronics 、 Laser 、 Analytical chemistry 、 Dye laser 、 Luminescence 、 Laser pumping 、 Chemistry 、 Laser-induced fluorescence
摘要: A detection system for the measurement of tropospheric OH radicals by laser-induced fluorescence has been developed. Ambient air is expanded through a nozzle into cell and irradiated at low pressure pulsed frequency-doubled dye laser. The laser wavelength tuned to selectively excite on single rovibronic transition 308 nm. OH-resonance fluorescence, emitted mostly between 307 311 nm, detected gated photomultiplier/photon counter assembly. This excitation/detection method reduces interferences due generated efficiently far below projected limit detection. Calibration our present yields (SNR = 2) 8.2 x 10 exp 6 OH/cu cm 5-min on-resonance off-resonance signal integration period pulse repetition rate 20 Hz. considerable improvement 3.7 5 anticipated replacing currently available copper-vapor pumped allowing higher kHz. would allow useful in situ measurements testing current chemistry models.© (1993) COPYRIGHT SPIE--The International Society Optical Engineering. Downloading abstract permitted personal use only.
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