Abstract
A study of synchrotron radiation induced photoionization and photodissociation of CO2 has been performed using the Swedish national synchrotron facility Max in Lund. Monochromatic synchrotron radiation, in the 10-30 eV region, has been used to obtain mass spectra of the CO2+, CO+, O+, and C+ ions. The observed structure is interpreted in terms of autoionization and photodissociation processes via excited Rydberg states in CO2 converging to the ionic X2 Pi g, A2 Pi u, B2 Sigma u+, and C2 Sigma u+ states. In the CO2+ ion yield measurements, new progressions are assigned as members of a Rydberg series converging to the A-state for which only the n*=2.5 member has been observed before. A transition to the bent valence state has been recorded and discussed. Fluorescence spectra obtained in the visible and VUV regions support ion yield results. Furthermore, structures originating from resonant autoionization have been found.
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