STM observations of bridge-bonded CO on Pt(111) and asymmetric on-top CO on Pt(100)

The formation of HOCO in the coadsorption of water and carbon monoxide on Pt3Ni(111)

“…The loss features at 48 and 58 meV arise from the vibration of the whole CO molecule, adsorbed at bridge (mode at 48 meV) and atop sites (peak at 58 meV), against the Pt(111) substrate. [32][33][34] Vibrational peaks at 230 and 258 meV arise from the intramolecular stretching vibration of CO adsorbed at bridge and atop sites, respectively, in agreement with previous results for CO adsorption on Pt(111) [35][36][37][38] and other transition-metal systems. 39 However, a preferential occupation of the atop site with respect to the bridge is observed for CO/ Pt 3 Ni(111).…”

High-Pressure CO Phases on Co(0001) and Their Possible Role in the Fischer–Tropsch Synthesis

“…The mechanism by which the (2√3 × 2√3)R30°structure accommodated further CO has some similarity to the building principle of high-coverage CO structures on Pt(111) at low temperatures; the structures on this surface can also be understood by heavy domain walls. 23,24,26 Heavy domain wall formation is a way of enhancing the CO coverage that allows the molecules in the interior of the domains to remain at their preferred sites. It is distinctly different from the homogeneous compression of a hexagonal layer.…”

“…Adsorbed CO layers have, in fact, shown pressure gap effects on other surfaces. For example, on Pt(111), at low temperatures in UHV, CO forms domain phases in which additional CO is incorporated in “heavy domain walls”, whereas at 300 K and elevated pressures, the CO layer is homogeneously compressed to give hexagonal moiré structures. − Whether such pressure gap effects exist for CO on Co(0001) is largely unexplored.…”