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Journal Article

Vibrationally Resolved Inner-Shell Photoexcitation of the Molecular Anion C2-


Trinter,  Florian
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schippers, S., Hillenbrand, P.-M., Perry-Sassmannshausen, A., Buhr, T., Fuchs, S., Reinwardt, S., et al. (2023). Vibrationally Resolved Inner-Shell Photoexcitation of the Molecular Anion C2-. ChemPhysChem, 24(11): e202300061. doi:10.1002/cphc.202300061.

Cite as: https://hdl.handle.net/21.11116/0000-000C-F4F1-0
Carbon 1s core-hole excitation of the molecular anion C2- has been experimentally studied at high resolution by employing the photon-ion merged-beams technique at a synchrotron light source. The experimental cross section for photo–double-detachment shows a pronounced vibrational structure associated with 1σu ->3σg and 1σg ->1πu core excitations of the C2- ground level and first excited level, respectively. A detailed Franck-Condon analysis reveals a strong contraction of the C2- molecular anion by 0.2 Å upon this core photoexcitation. The associated change of the molecule's moment of inertia leads to a noticeable rotational broadening of the observed vibrational spectral features. This broadening is accounted for in the present analysis which provides the spectroscopic parameters of the C2-u-1g2 2u+ and
g-1g2 2g+ core-excited levels.