Photoelectron spectra of C sub 2 sup minus and C sub 2 H sup minus

Journal Article · Thu Feb 07 04:00:00 EST 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100156a026· OSTI ID:5202682

Ervin, K M; Lineberger, W C ^[1]

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1. Univ. of Colorado, Boulder (USA) National Inst. of Standards and Technology, Boulder, CO (USA)

The photoelectron spectra of C{sub 2}{sup {minus}} and C{sub 2}H{sup {minus}} have been measured at a photon energy of 3.531 eV. The electron affinities of dicarbon, EA(C{sub 2}) = 3.269 {plus minus} 0.006 eV, and ethynyl radical, EA(C{sub 2}H) = 2.969 {plus minus} 0.006 eV, are determined. The dissociation energy of dicarbon anion, D{sub 0}(C{sub 2}{sup {minus}}) = 187.2 {plus minus} 2.5 kcal mol{sup {minus}1}, is derived from the experimental electron affinities of C{sub 2} and C and the literature value for the dissociation energy of neutral dicarbon, D{sub 0}(C{sub 2}) = 141.0 {plus minus} 2.5 kcal mol{sup {minus}1}. The CC stretch fundamental and CCH bending vibrational levels up to v = 3 are observed in C{sub 2}H(X{sup 2}{Sigma}{sup +}). The fundamental frequencies for C{sub 2}H{sup {minus}}(X{sup 1}{Sigma}{sup +}) are 1,800 {plus minus} 20 cm{sup {minus}1} (CC stretch) and 505 {plus minus} 20 cm{sup {minus}1} (CCH bend). The photoelectron spectrum of ethynyl exhibits strong non-Franck-Condon transitions, induced by vibronic coupling, to odd vibrational levels in the CCH bend.

• OSTI ID: 5202682
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:3; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
AFFINITY
ALKYL RADICALS
CARBON
DATA
DATA ANALYSIS
DISSOCIATION ENERGY
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
ENERGY RANGE
ETHYL RADICALS
EV RANGE
EV RANGE 01-10
EXPERIMENTAL DATA
FRANCK-CONDON PRINCIPLE
INFORMATION
NONMETALS
NUMERICAL DATA
PHOTOELECTRON SPECTROSCOPY
RADICALS
SPECTROSCOPY