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UNDERSTANDING CHEMICAL REACTIONS INVOLVING NON-ADIABATIC TRANSITIONS: PREDISSOCIATION OF THE ELECTRONICALLY EXCITED Li-HF COMPLEX

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Recent Advances in the Theory of Chemical and Physical Systems

Part of the book series: Progress in Theoretical Chemistry and Physics ((PTCP,volume 15))

Abstract

The electronic predissociation from several excited electronic states of LiHF is studied using a time dependent Golden rule treatment, in an adiabatic representation. The potential energy surfaces used are those developed recently [J. Chem. Phys. 119 (2003) 10088] to simulate the experimental spectrum. The nonadiabatic couplings are calculated using highly correlated electronic functions and a finite difference method. It is found that the electronic predissociation process towards the ground electronic state yields to the formation of LiF products, with a large probability, > 90%. Also, the lifetimes associated to the A states are much shorter than for the B state. It is inferred that the electronic predissociation from the B and B’ electronic states should take place through the A electronic state, which acts as a doorway. Such process is explained by important ∑ – Π vibronic couplings appearing between the A, B and B’s.

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AGUADO, A., PANIAGUA, M., SANZ, C., RONCERO, O. (2006). UNDERSTANDING CHEMICAL REACTIONS INVOLVING NON-ADIABATIC TRANSITIONS: PREDISSOCIATION OF THE ELECTRONICALLY EXCITED Li-HF COMPLEX. In: JULIEN, JP., MARUANI, J., MAYOU, D., WILSON, S., DELGADO-BARRIO, G. (eds) Recent Advances in the Theory of Chemical and Physical Systems. Progress in Theoretical Chemistry and Physics, vol 15. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4528-X_19

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