A unique CO chemisorption mode (α₁CO), with the lowest reported CO stretching frequencies (1150-1330 cm^-1) on any clean or promoted metal surface, has been identified on Cr(110) by means of EELS, ESDIAD, LEED, AES, and oxygen coadsorption experiments. A "lying down" binding configuration in twofold-symmetric hollow sites is proposed for α₁CO molecules. For θCO>0.25, a second mode (α₂CO) bound perpendicular to Cr(110) is populated.
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Shinn et al. (1984) studied this question.
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