Distinguishing resonance symmetries with energy-resolved photoion angular distributions from ion-pair formation in O$_2$ following two-photon absorption of a 9.3 eV femtosecond pulse

• URL: http://arxiv.org/abs/2006.11484v2
• Date: Wed, 26 Aug 2020 18:26:09 GMT
• Title: Distinguishing resonance symmetries with energy-resolved photoion angular distributions from ion-pair formation in O$_2$ following two-photon absorption of a 9.3 eV femtosecond pulse
• Authors: Kirk A. Larsen, Robert R. Lucchese, Daniel S. Slaughter, Thorsten Weber
• Abstract summary: We present a combined experimental and theoretical study on the photodissociation dynamics of ion-pair formation in O$$ following resonant two-photon absorption of a 9.3 eV femtosecond pulse. Ion-pair formation states of $3Sigma-_g$ and $3Pi_g$ symmetry are accessed through predissociation of optically dark continuum Rydberg states converging to the B $2Sigma-_g$ ionic state. The KER-dependent photoion angular distribution reveals the underlying two-photon absorption dynamics
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a combined experimental and theoretical study on the photodissociation dynamics of ion-pair formation in O$_2$ following resonant two-photon absorption of a 9.3 eV femtosecond pulse, where the resulting O$^+$ ions are detected using 3-D momentum imaging. Ion-pair formation states of $^3\Sigma^-_g$ and $^3\Pi_g$ symmetry are accessed through predissociation of optically dark continuum Rydberg states converging to the B $^2\Sigma^-_g$ ionic state, which are resonantly populated via a mixture of both parallel-parallel and parallel-perpendicular two-photon transitions. This mixture is evident in the angular distribution of the dissociation relative to the light polarization, and varies with the kinetic energy release (KER) of the fragmenting ion-pair. The KER-dependent photoion angular distribution reveals the underlying two-photon absorption dynamics involved in the ion-pair production mechanism and indicates the existence of two nearly degenerate continuum resonances possessing different symmetries, which can both decay by coupling to ion-pair states of the same total symmetry through internal conversion.

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