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Reflection i.-r. absorption spectra of CO adsorbed on thick film copper mirrors at room temperature show a narrow band at 2105 cm–1 accompanied by a broad band at 2092 cm–1. The relative intensities of these bands are variable for films deposited in ultra-high vacuum conditions. The dependences of absorption on angle of incidence and plane of polarization are in qualitative agreement with the theoretical predictions of Greenler.
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Pritchard et al. (1970) studied this question.
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