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The differential vibrational excitation cross section v=0 to v=1 has been obtained for CO in a crossed molecular-beam electron-beam apparatus in the 1-30 eV energy range. Besides the well known pi shape resonance at 1.8 eV, a broad and low-intensity peak centred at 19.5 eV is observed and attributed to a sigma shape resonance. Angular distributions within the sigma resonance energy show the contribution of the f wave (l=3).
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Tronc et al. (1980) studied this question.
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