Fig. 2: Electron spectra of valence and core-valence ionized allene.
From: Symmetry breaking in core-valence double ionisation of allene
a A close-up of the lowest core-valence double ionisation feature obtained at 350.4 eV at the synchrotron radiation facility BESSY-II which comprises a central peak at 310.8 eV about twice as strong as the two adjacent peaks at 309.3 and 312.1 eV, respectively. The results of a least-square curve-fitting analysis are also included in this panel. b holds the core-valence double ionisation spectrum of allene from (a), but with shifted energy scale for comparison to single ionisation valence photoelectron spectrum of allene (c). c is from ionisation at 40.8 eV photon energy provided by a gas discharge lamp compared to the core-valence double ionisation spectrum of allene and is corrected for pre-pulse ionisation events.
