Abstract

Vibrationally resolved N 2 + (B–X) (1–2) and (0–1) emission bands were recorded after photoexcitation of N 2 in the 20–46 eV energy range. The branching ratio between these transitions reveals strong non-Franck–Condon effects. Ab initio calculations using a configuration interaction method based on Kohn–Sham orbitals indicate that the autoionisation of certain superexcited states is responsible for some structures present in the branching ratio curve.

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