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Title: Dipole-bound excited states and resonant photoelectron imaging of phenoxide and thiophenoxide anions

Abstract

We report photodetachment and resonant photoelectron-imaging studies of cryogenically cooled phenoxide (C 6H 5O ) and thiophenoxide (C 6H 5S ) anions. In a previous study, a dipole-bound excited state was observed for C 6H 5O at 97 cm –1 below the detachment threshold. Eight resonant photoelectron spectra were obtained via excitations to eight vibrational levels of the dipole-bound state (DBS) followed by autodetachment. In this paper, we present a complete photodetachment spectrum of C 6H 5O covering a spectral range 2600 cm –1 above the detachment threshold and revealing nine additional vibrational resonances of the DBS. We also report the first observation of a dipole-bound excited state for C 6H 5S , 39 cm –1 below its detachment threshold of 18 982 cm –1. Photodetachment spectroscopy covering a spectral range 1500 cm –1 above the threshold reveals twelve vibrational resonances for the DBS of C 6H 5S . By tuning the detachment laser to the vibrational resonances in the DBS of C 6H 5O and C 6H 5S , we obtain highly non-Franck-Condon resonant photoelectron spectra, as a result of mode-selectivity and the Δv = –1 propensity rule for vibrational autodetachment. Five new fundamental vibrational frequenciesmore » are obtained for the ground state of the C 6H 5O ( X 2B 1) radical. Intramolecular inelastic scattering is observed in some of the resonant photoelectron spectra, leading to the excitation of the Franck-Condon-inactive lowest-frequency bending mode (ν 20) of C 6H 5O. The first excited state of C 6H 5O ( A 2B 2) is observed to be 0.953 eV above the ground state. Twelve resonant photoelectron spectra are obtained for C 6H 5S , allowing the measurements of seven fundamental vibrational frequencies of the C 6H 5S radical, whereas the non-resonant photoelectron spectrum exhibits only a single Franck-Condon active mode. The current study again demonstrates that the combination of photodetachment spectroscopy and resonant photoelectron spectroscopy is a powerful technique to obtain vibrational information about polar radical species.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Brown Univ., Providence, RI (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Brown Univ., Providence, RI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1594592
Alternate Identifier(s):
OSTI ID: 1478445
Grant/Contract Number:  
SC0018679
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 149; Journal Issue: 16; 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

Citation Formats

Zhu, Guo-Zhu, Qian, Chen-Hui, and Wang, Lai-Sheng. Dipole-bound excited states and resonant photoelectron imaging of phenoxide and thiophenoxide anions. United States: N. p., 2018. Web. doi:10.1063/1.5049715.
Zhu, Guo-Zhu, Qian, Chen-Hui, & Wang, Lai-Sheng. Dipole-bound excited states and resonant photoelectron imaging of phenoxide and thiophenoxide anions. United States. https://doi.org/10.1063/1.5049715
Zhu, Guo-Zhu, Qian, Chen-Hui, and Wang, Lai-Sheng. Mon . "Dipole-bound excited states and resonant photoelectron imaging of phenoxide and thiophenoxide anions". United States. https://doi.org/10.1063/1.5049715. https://www.osti.gov/servlets/purl/1594592.
@article{osti_1594592,
title = {Dipole-bound excited states and resonant photoelectron imaging of phenoxide and thiophenoxide anions},
author = {Zhu, Guo-Zhu and Qian, Chen-Hui and Wang, Lai-Sheng},
abstractNote = {We report photodetachment and resonant photoelectron-imaging studies of cryogenically cooled phenoxide (C6H5O–) and thiophenoxide (C6H5S–) anions. In a previous study, a dipole-bound excited state was observed for C6H5O– at 97 cm–1 below the detachment threshold. Eight resonant photoelectron spectra were obtained via excitations to eight vibrational levels of the dipole-bound state (DBS) followed by autodetachment. In this paper, we present a complete photodetachment spectrum of C6H5O– covering a spectral range 2600 cm–1 above the detachment threshold and revealing nine additional vibrational resonances of the DBS. We also report the first observation of a dipole-bound excited state for C6H5S–, 39 cm–1 below its detachment threshold of 18 982 cm–1. Photodetachment spectroscopy covering a spectral range 1500 cm–1 above the threshold reveals twelve vibrational resonances for the DBS of C6H5S–. By tuning the detachment laser to the vibrational resonances in the DBS of C6H5O– and C6H5S–, we obtain highly non-Franck-Condon resonant photoelectron spectra, as a result of mode-selectivity and the Δv = –1 propensity rule for vibrational autodetachment. Five new fundamental vibrational frequencies are obtained for the ground state of the C6H5O (X2B1) radical. Intramolecular inelastic scattering is observed in some of the resonant photoelectron spectra, leading to the excitation of the Franck-Condon-inactive lowest-frequency bending mode (ν20) of C6H5O. The first excited state of C6H5O (A2B2) is observed to be 0.953 eV above the ground state. Twelve resonant photoelectron spectra are obtained for C6H5S–, allowing the measurements of seven fundamental vibrational frequencies of the C6H5S radical, whereas the non-resonant photoelectron spectrum exhibits only a single Franck-Condon active mode. The current study again demonstrates that the combination of photodetachment spectroscopy and resonant photoelectron spectroscopy is a powerful technique to obtain vibrational information about polar radical species.},
doi = {10.1063/1.5049715},
url = {https://www.osti.gov/biblio/1594592}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 16,
volume = 149,
place = {United States},
year = {2018},
month = {10}
}

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