The Auger decay from the C core-ionized state of CO has been studied with photon energies close to and far above threshold. Close to the threshold post-collision interaction (PCI) redistributes intensity from the low kinetic energy side to the high kinetic energy side of the Auger lines. Taking advantage of this a previously unresolved vibrational level of the B final state has now been observed and we have extracted a vibrational splitting of 0.27(3) eV. This shows how the PCI effect not only broadens the Auger line, but that the associated asymmetric line sharpening can be used to reveal the finer details of the Auger spectrum.
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Sundin et al. (1997) studied this question.
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