ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The low-lying electronic states of CCO have been investigated by photoelectron spectroscopy of CCO− at wavelengths of 266 and 355 nm in conjunction with ab initio calculations. Photodetachment is observed to occur to the X˜ 3Σ−, A˜ 3Π, a˜ 1Δ, and b˜ 1Σ+ electronic states of CCO. This marks the first observation of the low-lying singlet states. A revised value for the electron affinity of CCO is found to be 2.289±0.018 eV. These results are compared with CASPT2 ab initio calculations of the energetics and structure of the ground and excited states of CCO and CCO−. Using the measured electron affinity of CCO, the heats of formation Δf H0298(CCO)=3.99±0.20 eV and ΔfH0298(CCO−)=1.67±0.20 eV are determined. In addition, the C–C bond dissociation energies in CCO and CCO− are determined, as well as the H–CCO bond energy in HCCO. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.473000
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