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- W2018031276 abstract "The equilibrium geometry of the ethynyl (CCH) radical has been obtained using the results of high-level quantum chemical calculations and the available experimental data. In a purely quantum chemical approach, the best theoretical estimates (1.208 Å for rCC and 1.061−1.063 Å for rCH) have been obtained from CCSD(T), CCSDT, MR-AQCC, and full CI calculations with basis sets up to core-polarized pentuple-zeta quality. In a mixed theoretical−experimental approach, empirical equilibrium geometrical parameters (1.207 Å for rCC and 1.069 Å for rCH) have been obtained from a least-squares fit to the experimental rotational constants of four isotopomers of CCH which have been corrected for vibrational effects using computed vibration-interaction constants. These geometrical parameters lead to a consistent picture with remaining discrepancies between theory and experiment of 0.001 Å for the CC and 0.006−0.008 Å for the CH distances, respectively. The corresponding rs and r0 geometries are shown not to be representative for the true equilibrium structure of CCH." @default.
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- W2018031276 date "2004-02-17" @default.
- W2018031276 modified "2023-10-14" @default.
- W2018031276 title "Equilibrium Geometry of the Ethynyl (CCH) Radical" @default.
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- W2018031276 doi "https://doi.org/10.1021/jp036885t" @default.
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