Abstract
We present a new inversion procedure for the dispersion integral equation relating the total photoabsorption cross section to the frequency-dependent (dynamic) polarizability of an atom or molecule. Together with a reliable method to calculate the latter, this opens a way to the calculation of photoabsorption cross sections for complex molecules. We assess the reliability of the new inversion method by inverting the response functions for Ar, Kr, N 2 and CO as obtained by the time-dependent second-order Møller-Plesset method and comparing with other theoretical and experimental results.
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