资源环境科技发展态势分析平台

Classical molecular dynamics simulations (CMDS) are used for calculations of the collision-induced absorption (CIA) by pure N-2 in the (2.1-2.2 mu m) region of the first overtone band. They lead to reasonable (+/- 15%) agreement with the only two laboratory measurements available, at 97 K and room temperature. Based on these experiment/theory comparisons, empirical corrections are made to the CMDS-calculated CIA of pure N-2 in the 200-300 K temperature range. In addition, the contribution of N-2-O-2 collisions is, in the absence of any laboratory measurement, calculated and a simple semiempirical model (the first of its kind) is built in order to predict the CIA of N-2 under Earth atmosphere conditions. This is successfully validated by comparisons with ground-based atmospheric transmission spectra in the 2.1-2.2 mu m region.