Abstract
A molecular dynamics simulation of an ensemble of water molecules has been performed using a flexible polarizable model. Far-infrared (FIR) radiation absorption cross sections of water vapor with various degrees of clusterization have been calculated in the dipole oscillator approximation. It is shown that the radiation absorption by libration vibrational modes is already observed for the clusters involving about ten molecules and shifts the absorption spectrum toward the maximum of the thermal radiation spectrum of the Earth.
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