The high-resolution FT interferometer of the Laboratoire d’Infrarouge at Orsay has been used to investigate the broadening of N2O lines in the 4- and 8-µm spectral regions. All data were taken at both room temperature and 220 K. The uncertainty of the measured values of linewidths was estimated to <4%. From these data, the exponent n of the temperature dependence of linewidths was experimentally determined for the first time, for the systems N2O-N2O, N2O-N2, and N2O-O2. In the first two cases, it was shown that n is nearly J-independent, whereas it seems to vary linearly for N2O-O2. Finally the values of N2O air-broadened linewidths were derived for the two temperatures 295 K and 220 K representing the upper and lower boundaries of middle atmosphere temperatures.
© 1984 Optical Society of America
Nelly Lacome, Armand Levy, and Guy Guelachvili, "Fourier transform measurement of self-, N2-, and O2-broadening of N2O lines: temperature dependence of linewidths," Appl. Opt. 23, 425-435 (1984)