Perturbations by States with Infinite Radiative Lifetime Simple Intensity Borrowing

1 Perturbations by States with Infinite Radiative Lifetime Simple Intensity Borrowing 

Let the vibronic basis functions 1 and 2 correspond to a mutually interacting pair of electronic levels, 

The simplest and most common situation is that basis functions 1 and 2 have, respectively, appreciable and negligible transition probability into a lower energy basis function 0, 

I20 will be negligible whenever the lifetime of basis function 2 is infinite, 

The result of the Hi2 interaction is two mixed eigenstates, the higher-energy eigenstate, +), corresponding to the eigenenergy 

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