Vibrationally resolved partial cross sections and asymmetry parameters for carbon K-shell photoionization of the CO_2 molecule

摘要

We have measured the vibrationally resolved partial cross sections sigma_{v_1^{prime}} and asymmetry parameters eta_{v_1^{prime}} for C K-shell photoionization of the CO2 molecule in the Σu shape resonance region above the C K-shell ionization threshold. The positions of both the maxima of sigma_{v_1^{prime}} and the minima of eta_{v_1^{prime}} move towards the C K-shell threshold with increasing symmetric stretching vibrational excitation v'1 in the C 1s single-hole state. Calculations employing the relaxed-core Hartree–Fock approach reproduce the observed vibrational effects.