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Ashworth, Eleanor K., Ashworth, Stephen H. 
ORCID: https://orcid.org/0000-0003-4213-3541 and Bull, James N. ORCID: https://orcid.org/0000-0003-0953-1716
(2024)
Spectroscopy and dynamics of isolated anions: Versatile instrumentation for photodetachment and photoelectron spectroscopy.
Review of Scientific Instruments, 95 (7).
ISSN 0034-6748
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Abstract
Molecular anions are appealing targets for study because, compared with their neutral and cationic counterparts, they can be probed with conventional laboratory lasers without the need for multiphoton ionization schemes, and they provide spectroscopic details on the corresponding neutral molecules. Here, we describe a section of a modular instrument designed to perform high-throughput photoelectron and photodetachment spectroscopy of gas-phase anions, with future provision for time-resolved and isomer-selective spectroscopy. The instrument framework allows for the incorporation and adaptation of several ion sources, as demonstrated here with plasma (electric) discharge sources providing variable hard to soft ion generation conditions. The generated anions are separated according to their mass-to-charge ratio through time-of-flight mass spectrometry ( m/z Δm/z = 500–600) and are focused into a set of perpendicular velocity-map imaging electrodes (ΔE E ≈4%), where mass-selected anions are probed using laser light and the ejected electrons are velocity-map imaged. Instrument performance is demonstrated through the acquisition of photodetachment and photoelectron spectra for CH2CN−, showing sharp resonances in the vicinity of the detachment threshold assigned to rovibrational states of a dipole-bound anion and broader lifetime-limited spectral features at photon energies well above the threshold assigned to prompt autodetachment from a temporary anion resonance. Similar measurements could be performed on any molecular anions generated in the sources.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | anion,photodetachment spectroscopy,photoelectron spectroscopy,gas phase,physical and theoretical chemistry,spectroscopy,atomic and molecular physics, and optics ,/dk/atira/pure/subjectarea/asjc/1600/1606 |
| Faculty \ School: | Faculty of Science Faculty of Science > School of Chemistry (former - to 2024) Faculty of Science > School of Physics (former - to 2024) Faculty of Science > School of Natural Sciences (former - to 2024) |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Centre for Photonics and Quantum Science Faculty of Science > Research Groups > Chemistry of Light and Energy |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 12 Jul 2024 13:32 |
| Last Modified: | 05 Nov 2024 00:51 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/95901 |
| DOI: | 10.1063/5.0207759 |
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