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J Chem Phys. 2010 Nov 7;133(17):174307. doi: 10.1063/1.3499813.

A theoretical approach to the photochemical activation of matrix isolated aluminum atoms and their reaction with methane.

Author information

1
Instituto de Física, Universidad Nacional Autónoma de México, AP 20-364, Mexico 01000 Distrito Federal, Mexico. madelalba@gmail.com

Abstract

The photochemical activation of Al atoms in cryogenic matrices to induce their reaction with methane has been experimentally studied before. Here, a theoretical study of the nonadiabatic transition probabilities for the ground ((2)P:3s(2)3p(1)) and the lowest excited states ((2)S:3s(2)4s(1) and (2)D:3s(2)3d(1)) of an aluminum atom interacting with a methane molecule (CH(4)) was carried out through ab initio Hartree-Fock self-consistent field calculations. This was followed by a multiconfigurational study of the correlation energy obtained by extensive variational and perturbational configuration interaction analyses using the CIPSI program. The (2)D state is readily inserted into a C-H bond, this being a prelude to a sequence of avoided crossings with the initially repulsive (to CH(4)) lower lying states (2)P and (2)S. We then use a direct extension of the Landau-Zener theory to obtain transition probabilities at each avoided crossing, allowing the formation of an HAlCH(3) intermediate that eventually leads to the final pair of products H+AlCH(3) and HAl+CH(3).

PMID:
21054032
DOI:
10.1063/1.3499813

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