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  • Articles: DFG German National Licenses  (1)
  • 1970-1974  (1)
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  • Articles: DFG German National Licenses  (1)
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    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 20 (1971), S. 282-291 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Resultate von ab initio-Rechnungen für das CH3-Radical für die tiefliegenden Konfigurationen werden angegeben. Die Konfiguration des tiefsten 2 E′-Zustandes resultiert allerdings bei planarer Geometrie nicht aus der Elektronen-Grundkonfiguration. Letztere ist zwar bei fast pyramidaler Struktur wesentlich tiefer, schneidet aber erstere im Verlauf der Verzerrung des Moleküls. In dieser Region ist die HF-Näherung nicht mehr gültig. — Die anderen tiefliegenden Konfigurationen [2A″2 (Grund-Konfiguration), 2 A′1 (3s Rydberg) und 1 A′1 (Ion)] verhalten sich normal.
    Notes: Abstract Ab initio LCAO-MO-SCF calculations have been performed on assorted low-lying configurations of the CH3 radical to assess the adequacy of the Hartree-Fock treatment of this species. The 2 E′ configuration of lowest energy in the planar ground state equilibrium geometry is shown not to be the valence configuration. Near its (pyramidal) equilibrium geometry the 2 E′ valence configuration is well below the other 2 E′ configuration. The two 2 E′ configurations must, then, cross as the molecule is distorted. In this region the Hartree-Fock formation is unable to describe 2 E′ states. The other low-lying states [2 A′'2 (ground), 2 A′1 (3s Rydberg), and 1 A′1 (ion)] and the 2 E′ states in the pyramidal geometry are satisfactorily determined within the Hartree-Fock formalism.
    Type of Medium: Electronic Resource
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