Excitation and decay spectra of core-excited resonances in acetaldehyde, propionaldehyde and acetone

摘要

Monochromatic synchrotron radiation was used to selectively excite core electrons of the carbon and oxygen atoms in acetaldehyde, propionaldehyde and acetone, creating neutral core-excited resonance states. Electron energy spectra associated with autoionization of the strong resonances in these molecules were collected. The character of each resonance state was deduced from its decay spectrum. Among other conclusions, this analysis suggests that the highest-energy, intense carbon core-excited resonance in acetaldehyde arises from excitation of two degenerate core-excited states, one with the core-hole site located on the carbonyl carbon and the other with the core-hole site located on the alkyl carbon.