Radiationless transitions in gaseous nitrogen heterocyclics: Energy dependence of internal conversion in quinoline and isoquinoline

Abstract

Energy dependence of luminescence from quinoline and isoquinoline vapors indicates that S₁→S₀ internal conversion, already important at zero excess vibrational energy, becomes the dominant photophysical process with vibrational excitation of the molecule in S₁. This is predicted to be a general phenomenon for molecules with closely spaced, lowest energy, nπ* and ππ* singlet states.