Abstract
We present a high-resolution C K- and O K-NEXAFS study for the large aromatic molecule acenaphthenequinone (ANQ) in the condensed phase. This is the largest molecule for which a distinct vibronic fine structure at the O K-edge has been resolved so far. The most prominent results are the appearance of only one predominant vibrational mode, a C–H stretching mode, in the O 1s NEXAFS spectra and the analysis of the anharmonicity of the excited state potential.
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