Abstract
The photodissociation of Br2 was investigated within the near-visible UV absorption band. Based on the potential curves for the ground and low-lying excited states, the optical cross-sections for the discrete transitions of C1u, B3+0u, A31uX1+g and their total energy absorption spectrum are derived, and the quantum yield of (Br + Br*) channel are determined correspondingly. The one-dimensional LandauZener model is used to evaluate the behavior of curve crossing during photodissociation. The results indicate that the influence of nonadiabatic mechanism, which may be caused by the electronic-vibrational interplay between the B and C states, is negligibly small for the (Br + Br*), channel. From the LandauZener modeling of the observed product recoil parameter (Br+Br), the best-fit value of the coupling matrix element or coupling strength between the diabatic B and C state potentials is obtained.
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