Anion photoelectron spectroscopy is typically constrained by Franck-Condon considerations, so that only totally symmetric vibrational modes are active. By pre-exciting anion vibrations prior to photodetachment, one can access neutral vibrational energy levels and, more generally, regions of the neutral potential energy surface that are inaccessbie from the anion ground vibrational state. We will present results in which anions are pre-excited with an infrared laser and their photoelectron spectra is subsequently obtained using slow electron velocity-map imaging of cryogenically cooled anions (cryo-SEVI). The hydroxide anion will serve as the first test system for this new technique.

Photoelectron spectrsscopy of vibrationally excited anions

ACS Spring Meeting 2021

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