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The C 1s photoelectron spectrum of CO has been measured with high resolution in the threshold region. The data exhibit hitherto unresolved vibrational structure on the C 1s main photoelectron line as well as new features in the satellite region. The vibrational energy of the CO⁺ ion is 301±{}3 meV. The vibrational structure changes dramatically with photon energy due to the influence of the σ* shape resonance. The new satellite lines which are not present at high photon energies are attributed to conjugate shakeup processes.
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Randall et al. (1993) studied this question.
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