Quantum cascade laser spectroscopy of N2O in the 7.9 μm region for the in situ monitoring of the atmosphere

A quantum cascade laser spectrometer was used in the Groupe de Spectrométrie Moléculaire et Atmosphérique of Reims (France) to precisely study nitrous oxide (N2O) line parameters near 7.9 μm. The spectral region ranging from 1275 to 1280 cm-1, which is suitable for the in situ measurement of N2O in the atmosphere from balloon-borne measurements, was studied using a commercial laser from Alpes Lasers. Five lines of the ν1 band of N2O have been studied. The results of intensity measurements, air-broadening coefficients and their variation with temperature from −58 °C up to ambient temperature are compared with previous determinations and available databases. These results demonstrate that these parameters for N2O are quite well known in the literature. Parameters obtained in this work are given with a very high precision.