Publication Date:
2017-01-28
Description:
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 µm) 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 semi-empirical 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 µm region.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics
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