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1991•The Journal of Chemical PhysicsRequires access

Resonance enhanced multiphoton ionization photoelectron spectra of CO2. II. Competition between photoionization and dissociation

Ming Wu, David P. Taylor, Philip M. Johnson

Open publisher page 12 citations

Abstract

Resonance enhanced multiphoton ionization photoelectron spectra (REMPI-PES) of CO2 were obtained via several Rydberg states. Contrary to expected diagonal Franck–Condon factors, long vibrational progressions were seen in each photoelectron spectrum. The dominant vibration varied with the resonant state. A long progression of two quanta of the asymmetric stretch was observed in the PES through nf resonances, while symmetric stretches were more apparent with the 3p resonances. These results may arise from photoionization occurring during molecular dissociation.

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Resonance enhanced multiphoton ionization photoelectron spectra (REMPI-PES) of CO2 were obtained via several Rydberg states. Contrary to expected diagonal Franck–Condon factors, long vibrational progressions were seen in each photoelectron spectrum. The dominant vibration varied with the resonant state. A long progression of two quanta of the asymmetric stretch was observed in the PES through nf resonances, while symmetric stretches were more apparent with the 3p resonances. These results may arise from photoionization occurring during molecular dissociation.

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Available abstract

Resonance enhanced multiphoton ionization photoelectron spectra (REMPI-PES) of CO2 were obtained via several Rydberg states. Contrary to expected diagonal Franck–Condon factors, long vibrational progressions were seen in each photoelectron spectrum. The dominant vibration varied with the resonant state. A long progression of two quanta of the asymmetric stretch was observed in the PES through nf resonances, while symmetric stretches were more apparent with the 3p resonances. These results may arise from photoionization occurring during molecular dissociation.

Key concepts: Photoionization, Resonance-enhanced multiphoton ionization, Ionization, Rydberg formula, Dissociation (chemistry), Atomic physics, Spectral line, Rydberg state

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