Knowledge Bank

Lifetime measurements have been made for the individual rotational levels of $\nu^{\prime} = 0 $ and $\nu \prime =1$ for the $NH A^{3}\Pi $ and $c1\Pi$ $states.1$ In order to understand the origins of these predissociations, we have computed the Franck-Condon overlaps of the bound-bound interactions, namely $A3\Pi$ with the ground state $X3\Sigma -$ and the bound-repulsive interactions. i.e., $A3\Pi$ with $\mathrm{<mrow\; data-mjx-texclass="ORD">5</mrow>}\Sigma -$ state which arises from the ground state asymptote. It is found that the latter results in rapid variation of the overlaps as a function of the rotational quantum number. The theoretical matrix-element calculations are in progress and the comparison between the theoretical predissociation widths with the experimental data will be discussed.