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Title: Isomer-specific vibronic structure of the 9-, 1-, and 2-anthracenyl radicals via slow photoelectron velocity-map imaging

Abstract

Polycyclic aromatic hydrocarbons, in various charge and protonation states, are key compounds relevant to combustion chemistry and astrochemistry. In this paper, we probe the vibrational and electronic spectroscopy of gas-phase 9-, 1-, and 2-anthracenyl radicals (C14H9) by photodetachment of the corresponding cryogenically cooled anions via slow photoelectron velocity-map imaging (cryo-SEVI). The use of a newly designed velocity-map imaging lens in combination with ion cooling yields photoelectron spectra with <2 cm-1 resolution. Isomer selection of the anions is achieved using gas-phase synthesis techniques, resulting in observation and interpretation of detailed vibronic structure of the ground and lowest excited states for the three anthracenyl radical isomers. The ground-state bands yield electron affinities and vibrational frequencies for several Franck–Condon active modes of the 9-, 1-, and 2-anthracenyl radicals; term energies of the first excited states of these species are also measured. Spectra are interpreted through comparison with ab initio quantum chemistry calculations, Franck–Condon simulations, and calculations of threshold photodetachment cross sections and anisotropies. Experimental measures of the subtle differences in energetics and relative stabilities of these radical isomers are of interest from the perspective of fundamental physical organic chemistry and aid in understanding their behavior and reactivity in interstellar and combustion environments. Finallymore » and additionally, spectroscopic characterization of these species in the laboratory is essential for their potential identification in astrochemical data.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2]
+ Show Author Affiliations
  1. Department of Chemistry, University of California, Berkeley, CA 94720,
  2. Department of Chemistry, University of California, Berkeley, CA 94720,, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1238082
Alternate Identifier(s):
OSTI ID: 1414746
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 113 Journal Issue: 7; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; polycyclic aromatic hydrocarbons; anion photoelectron spectroscopy; velocity-map imaging; vibronic structure

Citation Formats

Weichman, Marissa L., DeVine, Jessalyn A., Levine, Daniel S., Kim, Jongjin B., and Neumark, Daniel M. Isomer-specific vibronic structure of the 9-, 1-, and 2-anthracenyl radicals via slow photoelectron velocity-map imaging. United States: N. p., 2016. Web. doi:10.1073/pnas.1520862113.
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Weichman, Marissa L., DeVine, Jessalyn A., Levine, Daniel S., Kim, Jongjin B., & Neumark, Daniel M. Isomer-specific vibronic structure of the 9-, 1-, and 2-anthracenyl radicals via slow photoelectron velocity-map imaging. United States. https://doi.org/10.1073/pnas.1520862113
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Weichman, Marissa L., DeVine, Jessalyn A., Levine, Daniel S., Kim, Jongjin B., and Neumark, Daniel M. Wed . "Isomer-specific vibronic structure of the 9-, 1-, and 2-anthracenyl radicals via slow photoelectron velocity-map imaging". United States. https://doi.org/10.1073/pnas.1520862113.
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@article{osti_1238082,
title = {Isomer-specific vibronic structure of the 9-, 1-, and 2-anthracenyl radicals via slow photoelectron velocity-map imaging},
author = {Weichman, Marissa L. and DeVine, Jessalyn A. and Levine, Daniel S. and Kim, Jongjin B. and Neumark, Daniel M.},
abstractNote = {Polycyclic aromatic hydrocarbons, in various charge and protonation states, are key compounds relevant to combustion chemistry and astrochemistry. In this paper, we probe the vibrational and electronic spectroscopy of gas-phase 9-, 1-, and 2-anthracenyl radicals (C14H9) by photodetachment of the corresponding cryogenically cooled anions via slow photoelectron velocity-map imaging (cryo-SEVI). The use of a newly designed velocity-map imaging lens in combination with ion cooling yields photoelectron spectra with <2 cm-1 resolution. Isomer selection of the anions is achieved using gas-phase synthesis techniques, resulting in observation and interpretation of detailed vibronic structure of the ground and lowest excited states for the three anthracenyl radical isomers. The ground-state bands yield electron affinities and vibrational frequencies for several Franck–Condon active modes of the 9-, 1-, and 2-anthracenyl radicals; term energies of the first excited states of these species are also measured. Spectra are interpreted through comparison with ab initio quantum chemistry calculations, Franck–Condon simulations, and calculations of threshold photodetachment cross sections and anisotropies. Experimental measures of the subtle differences in energetics and relative stabilities of these radical isomers are of interest from the perspective of fundamental physical organic chemistry and aid in understanding their behavior and reactivity in interstellar and combustion environments. Finally and additionally, spectroscopic characterization of these species in the laboratory is essential for their potential identification in astrochemical data.},
doi = {10.1073/pnas.1520862113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 7,
volume = 113,
place = {United States},
year = {Wed Jan 20 00:00:00 EST 2016},
month = {Wed Jan 20 00:00:00 EST 2016}
}
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https://doi.org/10.1073/pnas.1520862113
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