Photoelectron spectroscopy of anthracene and fluoranthene radical anions
Abstract
Here, we report the slow electron velocity map imaging spectroscopy of cryogenically cooled anthracene and fluoranthene radical anions, two similarly sized polycyclic aromatic hydrocarbon molecules. The results allow us to examine the lowest energy singlet and triplet states in the neutral molecules on equal footing from the anionic ground state. The analysis of the experimental spectra is aided by harmonic calculations and Franck-Condon simulations, which generally show good agreement with experimental values and spectra. The electron affinity of fluoranthene is measured to be 0.757(2) eV, which is larger than that of anthracene at 0.532(3) eV. The lowest energy triplet state in anthracene is observed at 1.872(3) eV above the singlet ground state, while that of fluoranthene is observed at 2.321(2) eV above its singlet ground state. Comparisons of experimental and calculated spectra show that in addition to the Franck-Condon active modes, there is a clear presence of vibrational modes that gain intensity via vibronic coupling in both the singlet and triplet states in both molecules. In addition, the triplet state generally exhibits increased vibronic coupling compared to the singlet state, with the fluoranthene triplet state exhibiting evidence of distortion from C2v symmetry.
- Authors:
-
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemistry
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1469198
- Alternate Identifier(s):
- OSTI ID: 1456264
- Grant/Contract Number:
- SC0010326; CHE-0840494
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 148; Journal Issue: 23; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ion-trap; velocity map imaging; organic compounds; gas phase; Karlsruhe basis sets; photoelectron spectroscopy; triplet state
Citation Formats
Kregel, Steven J., Thurston, Glen K., and Garand, Etienne. Photoelectron spectroscopy of anthracene and fluoranthene radical anions. United States: N. p., 2018.
Web. doi:10.1063/1.5036757.
Kregel, Steven J., Thurston, Glen K., & Garand, Etienne. Photoelectron spectroscopy of anthracene and fluoranthene radical anions. United States. https://doi.org/10.1063/1.5036757
Kregel, Steven J., Thurston, Glen K., and Garand, Etienne. Thu .
"Photoelectron spectroscopy of anthracene and fluoranthene radical anions". United States. https://doi.org/10.1063/1.5036757. https://www.osti.gov/servlets/purl/1469198.
@article{osti_1469198,
title = {Photoelectron spectroscopy of anthracene and fluoranthene radical anions},
author = {Kregel, Steven J. and Thurston, Glen K. and Garand, Etienne},
abstractNote = {Here, we report the slow electron velocity map imaging spectroscopy of cryogenically cooled anthracene and fluoranthene radical anions, two similarly sized polycyclic aromatic hydrocarbon molecules. The results allow us to examine the lowest energy singlet and triplet states in the neutral molecules on equal footing from the anionic ground state. The analysis of the experimental spectra is aided by harmonic calculations and Franck-Condon simulations, which generally show good agreement with experimental values and spectra. The electron affinity of fluoranthene is measured to be 0.757(2) eV, which is larger than that of anthracene at 0.532(3) eV. The lowest energy triplet state in anthracene is observed at 1.872(3) eV above the singlet ground state, while that of fluoranthene is observed at 2.321(2) eV above its singlet ground state. Comparisons of experimental and calculated spectra show that in addition to the Franck-Condon active modes, there is a clear presence of vibrational modes that gain intensity via vibronic coupling in both the singlet and triplet states in both molecules. In addition, the triplet state generally exhibits increased vibronic coupling compared to the singlet state, with the fluoranthene triplet state exhibiting evidence of distortion from C2v symmetry.},
doi = {10.1063/1.5036757},
journal = {Journal of Chemical Physics},
number = 23,
volume = 148,
place = {United States},
year = {Thu Jun 21 00:00:00 EDT 2018},
month = {Thu Jun 21 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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