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Photoacoustic detection of NO2 and N2O using quantum cascade lasers |
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| Authors: | J.P. Lima H. Vargas A. Miklós M. Angelmahr P. Hess |
| Affiliation: | (1) Laboratório de Ciências Físicas – CCT, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000, Pq. Califórnia Campos dos Goytacazes, CEP 28013-602, Rio de Janeiro, RJ, Brazil;(2) Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany |
| Abstract: | Pulsed quantum cascade lasers (QCLs) with 6.2-μm and 8-μm wavelengths and a differential photoacoustic (PA) detector were used to measure concentrations of NO2 and N2O in the sub-ppmv range at ambient pressure. The QCL temperatures were tuned between -40 °C and 30 °C. Good agreement was found between measured PA vibrational spectra and simulated HITRAN spectra of both nitrogen oxides. The PA signals showed a linear dependence on the concentration in the investigated 0.5–50 ppmv region in both cases. The results for N2O are compared with a PA measurement of N2O at 2.9 μm using a grazing-incidence optical parametric oscillator. PACS 42.62.Fi; 82.80.Kq; 82.80.Gk; 92.60.Sz |
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