Abstract
Newly calculated radiative transition probabilities for the A(1)Sigma(+) -+ X-1 Sigma(+) and C-1 Sigma(+) --> X-1 Sigma(+) emission bands of KH are used to calculate the radiative and nonradiative lifetimes of the various vibrational levels (0 <= v <<= 35) and (0 <= v <= 55) of A(1)Sigma(+) and C-1 Sigma(+) states of the diatomic potassium hydride, KH molecule. For higher vibrational levels, an estimate of the bound-to-free emission probability is also needed and included. Accurate positions and radiative and nonradiative lifetimes of states belonging to the adiabatic A and C states of KH molecule are estimated. The results come from a Fermi's Golden Rule treatment in the coupling calculation. That confirms the accuracy reached in both approaches and also in the treatment of the diabatic-adiabatic transformation. It involves, in particular, an effective phase choice that is needed to properly estimate nonadiabatic couplings.