27 January 2017 Monitoring of nitrous acid (HONO) by external-cavity quantum cascade laser-based off-beam quartz-enhanced photoacoustic spectroscopy (QEPAS)
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Abstract
In this presentation, we report on the high-sensitivity and high-selectivity measurement of HONO by off-beam quartz-enhanced photoacoustic spectroscopy (QEPAS) in a very small gas sample volume (of ~ 40 mm3) resulting in a ultrashort residence time of less than 10 ms (compared to ~ 7 min for a conventional 210 m multipass cell or ~ 10-min. integration time for currently used chemical analytical instruments). A minimum detection limit of 66 ppbv (1σ) HONO was achieved at 70 mbar using a laser output power of 50 mW and 1 s integration time. This MDL was down to 7 ppbv at the optimal integration time of 150 s.
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Hongming Yi, Hongming Yi, Rabih Maamary, Rabih Maamary, Xiaoming Gao, Xiaoming Gao, Markus W. Sigrist, Markus W. Sigrist, Eric Fertein, Eric Fertein, Weidong Chen, Weidong Chen, } "Monitoring of nitrous acid (HONO) by external-cavity quantum cascade laser-based off-beam quartz-enhanced photoacoustic spectroscopy (QEPAS)", Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 1011137 (27 January 2017); doi: 10.1117/12.2251096; https://doi.org/10.1117/12.2251096
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