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MIR spectra, recorded at 100 K, of CO adsorbed at 25 mbar on SX001 (light blue), P25 (dark grey) and PC105 (orange), previously activated at 873 K. All the spectra have been normalized to the most intense peak at 2179 cm−1. In the inset a magnification of the signals showing the higher hypsochromic shift in the CO stretching vibration is reported.
