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Dual-level direct dynamics calculations of kinetic isotope effects for the CH4 +F→CH3 +HF abstraction reaction
- Source :
-
Chemical Physics Letters . Jun2005, Vol. 409 Issue 1-3, p38-42. 5p. - Publication Year :
- 2005
-
Abstract
- Abstract: Kinetic isotope effects (KIE) for hydrogen abstraction from CH4, CD4, and 13CH4 by fluorine was studied by the variational transition state theory with multidimensional tunneling contributions (VTST/MT). A low-level potential energy surface is obtained with the AM1SRP method. High-level energies, geometries and frequencies of the reactants, transition state, and products were computed using MP2 and CCSD(T) methods. Using the CVT/μOMT method, the kH/kD kinetic isotope effect value is 1.52 (298K), in excellent agreement with experimental values (1.4–1.5). All computed values of k12C/k13C KIE over a large range of temperatures (200–2000K) show normal values (KIE>1). [Copyright &y& Elsevier]
- Subjects :
- *QUANTUM chemistry
*REFERENCE values
*UNDERGROUND construction
*TEMPERATURE
Subjects
Details
- Language :
- English
- ISSN :
- 00092614
- Volume :
- 409
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Chemical Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 17924346
- Full Text :
- https://doi.org/10.1016/j.cplett.2005.04.098