Fourier transform measurement of self-, N(2)-, and O(2)-broadening of N(2)O lines: temperature dependence of linewidths.
The high-resolution FT interferometer of the Laboratoire d'Infrarouge at Orsay has been used to investigate the broadening of N(2)O lines in the 4- and 8-microm 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 N(2)O-N(2)O, N(2)O-N(2), and N(2)O-O(2). In the first two cases, it was shown that n is nearly J-independent, whereas it seems to vary linearly for N(2)O-O(2). Finally the values of N(2)O air-broadened linewidths were derived for the two temperatures 295 K and 220 K representing the upper and lower boundaries of middle atmosphere temperatures.
Lacome
N
N
Levy
A
A
Guelachvili
G
G