High resolution vibrational spectroscopy of CO on Ru(001): The importance of lateral interactions

Infrared studies of carbon monoxide hydrogenation over alumina-supported ruthenium

“…The plot is seen to consist of two distinct branches. While the shift in band position with coverage, observed in the present work is of the same magnitude as that reported for CO adsorption on Ru (001) surfaces (10,11), the highest and lowest frequencies observed in the single crystal studies are notably higher than those shown in Fig. 5.…”

From Adlayer Islands to Surface Alloy: Structural and Chemical Changes on Bimetallic PtRu/Ru(0001) Surfaces

“…In contrast, the intensity of the IR peak from CO adsorbed on Ru sites (2049 cm À1 ) has decreased. This development is caused by a combination of two effects: 1) a decreasing cross section for IR absorption of CO molecules on the Ru(0001) areas, which is also well known for CO ad coverages exceeding 0.33 ML on the unmodified Ru(0001), [35] and 2) dynamic coupling between CO molecules adsorbed on Pt and Ru areas. The latter effect, which leads to an intensity transfer from the low-frequency (CO ad /Ru) to the high-frequency band (CO ad /Pt), [36,37] is limited, however, to CO ad molecules directly at the interface between both areas.…”

Surface infrared reflection-absorption spectroscopy using a tunable diode laser

“…Using a similar approach, Mahaffy and Dignam [27] obtained a noise level equivalent to about 0.05% for a single reflection from a nickel surface. Golden et al [19], using a PEM, report noise levels of about 0.01%, and rotating polarizer experiments in which lock-in amplification has been successful [9,16,28] report similarly low noise levels. One final point concerns the asymmetry of the IRRAS bands (particularly evident in Fig.…”