Vibrationally-resolved structure in O2+ dissociation by intense ultrashort laser pulses
Abstract
Laser induced dissociation of O2+ is studied in the strong-field limit using a crossed laser-ion beam coincidence 3D momentum imaging method (790 and 395 nm, 40 fs, ~1015 W/cm2) . The measured kinetic energy release spectra from dissociation of O2+ reveal vibrational structure never observed before in multielectron molecules, which persists over a wide range of laser intensities. By evaluation of the potential energy curves, we assign the spectral energy peaks to dissociation via a one photon pathway | a4Πu >-->| f4Πg- 1ω >-- a bond softening mechanism similar to the one observed in H2+. Careful inspection unveils an apparent suppression in the dissociation of particular vibrational peaks which is a manifestation of the well-known Cooper minima effect. Laser induced dissociation of O2+ is studied in the strong-field limit using a crossed laser-ion beam coincidence 3D momentum imaging method (790 and 395 nm, 40 fs, ~1015 W/cm2) . The measured kinetic energy release spectra from dissociation of O2+ reveal vibrational structure never observed before in multielectron molecules, which persists over a wide range of laser intensities. By evaluation of the potential energy curves, we assign the spectral energy peaks to dissociation via a one photon pathway | a4Πu> -->| f4Πg- 1ω > -- a bond softening mechanism similar to the one observed in H2+. Careful inspection unveils an apparent suppression in the dissociation of particular vibrational peaks which is a manifestation of the well-known Cooper minima effect.
Supported by the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.- Publication:
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APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- May 2011
- Bibcode:
- 2011APS..DMP.L1106Z