Abstract
The cross sections and asymmetry parameters of the two $\ensuremath{\pi}\ensuremath{-}{\ensuremath{\pi}}^{*}^{2}\ensuremath{\Sigma}^{+}$ shakeup satellites on $\mathrm{C} 1s$ in the photoelectron spectrum of CO are found to differ significantly in the threshold region. The first satellite (due to triplet $\ensuremath{\pi}\ensuremath{-}{\ensuremath{\pi}}^{*}$ coupling) shows intensity enhancement near threshold whereas the second satellite (singlet $\ensuremath{\pi}\ensuremath{-}{\ensuremath{\pi}}^{*}$ coupling) decreases in intensity as expected for the adiabatic limit. Moreover, the data indicate that a shape resonance in the first-satellite channel is responsible for the observed effect rather than a conjugate shakeup process.
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