Infrared water vapor continuum absorption at atmospheric temperatures

摘要: We have used a continuous-wave carbon dioxide laser in single-mode realization of cavity ring-down spectroscopy to measure absorption coefficients water vapor at 944cm−1 for several temperatures the range 270–315 K. The conventional description infrared is applied, which modeled two parts consisting local line and remaining residual absorption, has become known as continuum. This continuum consists distinct water-water, water-nitrogen, water-oxygen continua. water-water coefficient found magnitude Cs(296K)=(1.82±0.02)×10−22cm2molecule−1atm−1, water-nitrogen Cn(296K)=(7.3±0.4)×10−25cm2molecule−1atm−1. temperature dependences both continua are shown be well represented by model describing expected behavior weakly bound binary complexes. Using this model, ou...