Abstract
A new electronic state of C2H, tentatively assigned as the 3pσ 2Π Rydberg state, has been observed by resonance-enhanced multiphoton spectroscopy (REMPI). The observed absorptions originate from vibrationally excited C2H and C2D formed in the photodissociation of C2H2, C2D2, and C2HD at 193 nm in a molecular beam. Two-laser experiments and REMPI spectroscopy of photofragments of the dissociation of C2HD were used to assign the carriers of the observed spectra to C2H and C2D. Two-photon resonant, three-photon ionization (2+1 REMPI) of C2H and C2D is accompanied by substantial fragmentation to C+2 ions caused by multiple photon absorption by resonantly excited C2H and C2D. The identity of the lower C2H electronic state(s) (Ã 2Π or X̃ 2Σ+ ) was not established.
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