Abstract
Photoion – fluorescence photon coincidence experiments were carried out in order to detect the fluorescence of NH3+ which is expected to occur from that part of its à electronic state that lies below the lowest dissociation limit. Hel and Nel sources were used to produce the ions. No NH3+ fluorescence was detected and upper limits for its quantum yield under our experimental conditions are given. We show that the lifetime of the à state is probably very long, making it difficult to observe fluorescence. Furthermore, we argue that the molecular parameters and potential energy surfaces of the à and [Formula: see text] states are such that resonance limit nonradiative coupling to high rovibrational levels of the [Formula: see text] state could be an efficient process for apparent intramolecular quenching of NH3+à state fluorescence.
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