Multiply charged anions are characterized by strong intramolecular Coulomb repulsions, which can have significant effects on the outgoing electrons in a photodetachment experiment. We have used photoelectron imaging to probe the effects of the Coulomb repulsion on the outgoing electron trajectories and have shown that the excess charges have significant influences on the outgoing electrons [1]. We have also developed a high-resolution velocity-map imaging system to study singly-charged anions produced using electrospray ionization and cooled in a cryogenic ion trap [2]. In our first experiment on phenoxide, we observed autodetachment resonances due to dipole bound excited states of the anion [3]. By tuning the detachment laser to the vibrational levels of the dipole-bound states, we obtained resonantly-enhanced photoelectron spectra that are highly non-Franck-Condon and yield much richer vibrational information [4]. We will show that resonant photoelectron spectroscopy via dipole bound states can also yield conformation-selective information [5].

From multiply-charged anions to ultracold anions: High-Resolution resonant photoelectron imaging via dipole-bound excited states

254th National Meeting (2017)

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