MEASUREMENTS OF THE NO2 ABSORPTION CROSS-SECTION FROM 42 000 CM(-1) TO 10 000 CM(-1) (238-1000 NM) AT 220 K AND 294 K

The NO2 absorption cross-section has been measured from 42000 to 10000 cm(-1) (238 - 1000 nm) with a Fourier transform spectrometer (at the resolution of 2 cm(-1), 0.01 nm at 240 nm to 0.2 nm at 1000 nm) and a 5 m temperature controlled multiple reflection cell. The uncertainty o n the cross-section is estimated to be less than 3% below 40000 cm(-1) (lambda > 250 nm) at 294 K, 3% below 30000 cm(-1) (lambda > 333 nm) a t 220 K, but reaches 10% for higher wavenumbers. Temperature and press ure effects have been observed. Comparison with data from the literatu re generally shows a good agreement for wavenumbers between 37500 and 20000 cm(-1) (267 - 500 nm). Outside these limits, the difference can reach several percent. (C) 1998 Elsevier Science Ltd. All rights reser ved.