Isomerization Reaction Surfaces: Quantum Mechanical Studies of Triplet C2H2, Singlet AlHO and Singlet C2H2O
Abstract
High-level ab initio molecular electronic structure theory has been utilized to investigate specific isomerization reaction surfaces including the triplet acetylene and vinylidene potential energy (PE) hypersurface, the X-tilde HAlO and AlOH PE hypersurface and the X-tilde oxirene potential energy minima. Basis sets as large as triple zeta plus two sets of polarization functions augmented with higher angular momentum functions TZ(2df,2pd) have been utilized in conjunction with correlated methods as sophisticated as the coupled cluster approach including all single, double and perturbative triple excitations CCSD(T). Of particular interest are predictions of the activation energies, zero-point vibrational energy (ZPVE) corrected barriers for rearrangement, of a-tilde 3B2 vinylidene to b-tilde 3Bu trans-bent acetylene and of cis-bent a 3B2 acetylene to trans-bent b-tilde 3Bu acetylene. The physical properties of a-tilde 3B2 vinylidene, including the dipole moment, harmonic vibrational frequencies and the infrared intensities, have also been reported. The activation energy and Delta E from X-tilde HAlO to X-tilde AlOH is predicted. Some molecular properties of HAlO and AlOH in their equilibrium geometries useful for experimental identification purposes are also given.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1995
- Accession Number
- ADA334924
Entities
People
- George R. Vacek
Organizations
- Air Force Research Laboratory