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.
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42.62.Fi; 82.80.Kq; 82.80.Gk; 92.60.Sz
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Lima, J., Vargas, H., Miklós, A. et al. Photoacoustic detection of NO2 and N2O using quantum cascade lasers. Appl. Phys. B 85, 279–284 (2006). https://doi.org/10.1007/s00340-006-2357-0
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DOI: https://doi.org/10.1007/s00340-006-2357-0