Abstract
In N 2 O a detailed study of the vibrational distribution of the X ˜ state reached after decay of core-to- π ∗ excitation of N terminal, N central and O 1 s core levels is reported. We observe a change in the relative intensity of bending versus stretching modes while scanning the photon energy across all three resonances. While this effect is known to be due to the Renner–Teller splitting in the core-excited states, we could derive that the antisymmetric stretching is excited mainly in the decay of the N terminal 1 s-to- π ∗ excitation. An explanation for such selectivity is provided in terms of interplay of vibrational structure on potential energy surfaces of different electronic states involved in the process.
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