The Ground And Excited States Of Aromatic Oxide Radicals Via Anion Photoelectron Spectroscopy
Kregel, Steven J.
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https://hdl.handle.net/2142/111130
Description
Title
The Ground And Excited States Of Aromatic Oxide Radicals Via Anion Photoelectron Spectroscopy
Author(s)
Kregel, Steven J.
Contributor(s)
Garand, Etienne
Issue Date
2021-06-23
Keyword(s)
Radicals
Abstract
Aromatic oxide free radicals play an important role in atmospheric and combustion chemistry, where they are involved in the formation of secondary organic aerosols and soot. The oxygen atom lone pairs can readily mix with the aromatic system giving rise to extensive electronic delocalization and influencing molecular reactivity. The oxygen atom also imparts a significant dipole moment to the radical system, which supports low-lying resonance and dipole bound states. We probed three cryogenically cooled aromatic oxide radicals (phenoxy, 1-naphthoxy, 2-naphthoxy) via Slow Electron Velocity Map Imaging (SEVI) to unravel their electronic and vibrational structure. We determined electron affinities and excited state energies for the three systems, and observed numerous active vibrational modes. Resonant photoexcitation to the dipole bound state was found to drastically alter the observed vibrational structure, and care was taken to avoid these resonances during direct photodetachment studies.
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