High-resolution absolute absorption cross sections of NO 2 at 295, 573, and 673 K at visible wavelengths

Abstract

Absolute absorption cross sections of nitrogen dioxide were measured with a resolution of 0.008 nm in 470–490, 520–534, 588–601, and 603–616 nm spectral regions at temperatures of 295, 573, and 673 K. An absolute error of ±10% is due principally to uncertainty in the NO 2 concentration. Absorption cross sections were also measured at these temperatures in the 450–650 nm spectral region with a resolution of 0.075 nm with an error of ±10%. All data were corrected for thermal decomposition of NO 2 at the elevated temperatures. The spectral features show broadening at elevated temperatures consistent with the breakdown of Δ K selection rules for higher rotational levels.