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Infrared emission due to W 3Δu (v′=4) → A 3Σ+u (v″=1, 2) and B′ 3Σ−u (v′=6) → B 3Πg (v″=1, 2) transitions of N2 molecules isolated in Kr matrices has been observed. The bottlenecks for radiationless relaxation which allow for a competition by these rather slow radiative transitions are identified by selectively populating individual vibrational levels in the vibrational progression of the A 3Σ+u, B 3Πg, a 1Πg, and w 1Δu states.
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Kühle et al. (1986) studied this question.
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