Abstract
Mass analysis studies were performed of ions detected after (2+n) REMPI of acetylene for resonance excitations to various gerade Rydberg states as a function of laser power. These data, along with STQN/DFT calculations for dissociation of acetylene to C2+H2, allowed an estimate of a threshold for photodissociation via gerade Rydberg states near 75000–77000cm−1. Mechanisms are proposed regarding (2+3) REMPI of acetylene to form C2+ as well as C+ and H+. Simulation analysis of partly-resolved rotational structured spectra recorded for different jet cooling allowed determinations of precise spectroscopic parameters and lifetime estimates for the Rydberg state, 4p1Δg00.
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