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14 April 2000 Real-time REMPI detection of benzene and toluene: a progress report
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Proceedings Volume 3929, Solid State Lasers IX; (2000)
Event: Symposium on High-Power Lasers and Applications, 2000, San Jose, CA, United States
A general concept of real-time detection of organic molecules via resonance enhanced multi-photon ionization (REMPI) was illustrated for the molecule indene at LASE '99. This paper focuses on benzene and toluene, which are ubiquitous components of fuels and widespread environmental contaminants in soil and groundwater. The 266.0 nm 4th harmonic wavelength from a Nd:YAG laser falls within the first UV absorption system of single ring benzenoid compounds, but overlap with the structured absorbance bands exhibited by benzene and toluene is poor. Tunable solid state laser options under consideration include Yb:YAG and Nd:KGW, although most of the work to date had been performed with a frequency-doubled tunable dye laser. A heuristic model of the REMPI process that considers laser wavelength and pulse energy, duration, and repetition frequency has been developed for evaluating laser options. Studies to determine the overlap of a free-running (i.e., non-tuned) Nd:KGW laser with benzene and toluene absorbance features are underway, as are determinations of the saturation fluences.
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Gregory D. Gillispie, Joseph L. Klingfus, and Steven McCormack "Real-time REMPI detection of benzene and toluene: a progress report", Proc. SPIE 3929, Solid State Lasers IX, (14 April 2000);

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