| Title: | Accurate Benchmark Calculation of the Reaction Barrier Height for Hydrogen Abstraction by the Hydroperoxyl Radical from Methane. Implications for CnH2n+2 where n = 2 → 4
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| Authors: | Aguilera-Iparraguirre J., Curran H.J., Klopper W. and Simmie J.M., 2008 |
| Abstract: | The CH4 + HO2• reaction is studied by using explicitly correlated coupled-cluster theory with singles and doubles (CCSD-R12) in a large 19s14p8d6f4g3h basis (9s6p4d3f for H) to approach the basis-set limit at the coupled-cluster singles−doubles level. A correction for connected triple excitations is obtained from the conventional CCSD(T) coupled-cluster approach in the correlation-consistent quintuple-ζ basis (cc-pV5Z). The highly accurate results for the methane reaction are used to calibrate the calculations of the hydroperoxyl-radical hydrogen abstraction from other alkanes. For the alkanes CnH2n+2 with n = 2 → 4, the reactions are investigated at the CCSD(T) level in the correlation-consistent triple-ζ (cc-pVTZ) basis. The results are adjusted to the benchmark methane reaction and compared with those from other approaches that are commonly used in the field such as CBS-QB3, CBS-APNO, and density functional theory. Rate constants are computed in the framework of transition state theory, and the results are compared with previous values available. |
| ICHEC Project: | BurnQuest: Towards a World Class Combustion Chemistry Centre |
| Publication: | Journal of Physical Chemistry A (2008) 112: 7047–7054 |
| URL: | http://dx.doi.org/10.1021/jp8012464 |
| Status: | Published |
