Energy-resolved photoion angular distributions from ion-pair formation in O2 following 2-photon absorption of a 9.3 eV femtosecond pulse
Abstract
We present a combined experimental and theoretical study on the photodissociation dynamics of ion-pair formation in O2 following resonant 2-photon absorption of a 35 femtosecond 9.3 eV pulse produced via 400 nm driven high harmonic generation, where the resulting O+ ions are detected using a 3-D momentum imaging spectrometer. Ion-pair formation states of 3Σg and 3Πg symmetry are accessed through predissociation of continuum molecular Rydberg states that are resonantly populated via a mixture of both ∥- ∥ and ∥- ⊥ 2-photon transitions, where this mixture varies with the kinetic energy release (KER) of the dissociating ion-pair. The variation in the mixture's composition is captured by the KER dependent photoion angular distribution, which helps clarify the underlying 2-photon absorption dynamics involved in the ion-pair formation mechanism and indicates that the propensity towards undergoing a ∥- ∥ or ∥- ⊥ transition varies with the molecular structure.
- Publication:
-
APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DMPQ01024L