Vibronic structure in resonant Auger Raman spectroscopy of large π-conjugated molecules

►Resonant Auger Raman shows electron-vibration coupling in organic molecules. ► The fine structure of the autoionization signal differs from direct photoemission. ► Continuous modifications are observed around an absorption resonance. ► These effects are very sensitive to the molecular environment. ► This allows analyzing even weak, predominantly non-covalent interaction.