Polynomial coefficients for calculating O2 Schumann-Runge cross sections at 0.5/cm resolution

Physics

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Absorption Cross Sections, Atmospheric Attenuation, Attenuation Coefficients, Oxygen, Polynomials, Schumann-Runge Bands, Least Squares Method, Light Transmission, Temperature Dependence

Scientific paper

O2 cross sections from 49,000 to 57,000/cm have been fitted with temperature dependent polynomial expressions, providing an accurate and efficient means of determining Schumann-Runge band cross sections for temperatures between 130 and 500 K. The least squares fits were carried out on a 0.5/cm spectral grid, using cross sections obtained from a Schumann-Runge line-by-line model that incorporates the most recent spectroscopic data. The O2 cross sections do not include the underlying Herzberg continuum, but they do contain contributions from the temperature dependent Schumann-Runge continuum. The cross sections are suitable for use in UV transmission calculations at high spectral resolution. They should also prove useful for updating existing parameterizations of ultraviolet transmission and O2 photolysis.

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