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A continuously tunable high resolution (0.2 cm^-1) infrared laser has been applied for the first time to infrared reflection absorption spectroscopy (IRAS) of submonolayer coverages of adsorbed molecules on a well-defined metal surface, i.e., single crystal Ru(001). The sensitivity, resolution, and continuous tunability of the laser are demonstrated with vibrational spectra of submonolayer CO adsorbed on Ru(001) (CTHETA=0.65). The results indicate a smaller bandwidth of the CO stretch (5 cm^-1) than previously observed. With an increase in substrate temperature from 85 to 300 K, a small frequency red shift of 2.5 cm^-1 is observed.
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Hoffmann et al. (1986) studied this question.
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