Quantum chemical coupled cluster study of the structure and spectra of the ground and first excited states of the ketenyl radical

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Abstract

The structure and spectra of the ketenyl radical have been investigated by ab initio quantum chemistry, using coupled cluster methods and basis sets of triple zeta quality including f functions. Three states are considered: the 1 2A″ (1 2Π) and 1 2A′ (1 2Π) states are the two components of the Renner-Teller pair originating in the lowest electronic state, while the 2 2Π state is the first electronically excited state, showing no Renner-Teller distortion. Equilibrium geometries, vibrational frequencies and excitation energies were calculated. The calculated data are compared with the limited spectroscopic information available. While the calculated values are in agreement with the microwave and infrared results, practically no common points with the UV spectrum reported by Krishnamachari and Venkatasubramanian were found. This indicates that a reinterpretation of the spectrum is necessary.

Original languageEnglish
Pages (from-to)91-99
Number of pages9
JournalChemical Physics Letters
Volume263
Issue number1-2
Publication statusPublished - Dec 6 1996

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Quantum chemistry
Excitation energy
Electronic states
Vibrational spectra
Excited states
Microwaves
Infrared radiation
Geometry
excitation
quantum chemistry
microwaves
geometry
electronics
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "The structure and spectra of the ketenyl radical have been investigated by ab initio quantum chemistry, using coupled cluster methods and basis sets of triple zeta quality including f functions. Three states are considered: the 1 2A″ (1 2Π) and 1 2A′ (1 2Π) states are the two components of the Renner-Teller pair originating in the lowest electronic state, while the 2 2Π state is the first electronically excited state, showing no Renner-Teller distortion. Equilibrium geometries, vibrational frequencies and excitation energies were calculated. The calculated data are compared with the limited spectroscopic information available. While the calculated values are in agreement with the microwave and infrared results, practically no common points with the UV spectrum reported by Krishnamachari and Venkatasubramanian were found. This indicates that a reinterpretation of the spectrum is necessary.",
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T1 - Quantum chemical coupled cluster study of the structure and spectra of the ground and first excited states of the ketenyl radical

AU - Szalay, P.

AU - Fogarasi, G.

AU - Nemes, L.

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AB - The structure and spectra of the ketenyl radical have been investigated by ab initio quantum chemistry, using coupled cluster methods and basis sets of triple zeta quality including f functions. Three states are considered: the 1 2A″ (1 2Π) and 1 2A′ (1 2Π) states are the two components of the Renner-Teller pair originating in the lowest electronic state, while the 2 2Π state is the first electronically excited state, showing no Renner-Teller distortion. Equilibrium geometries, vibrational frequencies and excitation energies were calculated. The calculated data are compared with the limited spectroscopic information available. While the calculated values are in agreement with the microwave and infrared results, practically no common points with the UV spectrum reported by Krishnamachari and Venkatasubramanian were found. This indicates that a reinterpretation of the spectrum is necessary.

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