Abstract
On the Ru(0001) surface Cs and CO form a very well ordered (Cs + CO)-(2 × 2) compound layer whose structure was determined recently (Cs on-top, CO in 3-fold sites). Here we present a vibrational analysis of the same system using high-resolution electron energy loss spectroscopy (HREELS), thermal desorption spectroscopy (TDS), and low-energy electron diffraction (LEED). Two CO stretch frequencies are observed depending on whether there are one or two CO molecules in the 2 × 2 cell. Two CO-Ru stretch modes are observed for the first time and are assigned to adsorption in the hcp and fcc hollow sites within the 2 × 2 cell. They are very weak in intensity which is attributed to the threefold-hollow site and some screening in the 2D compound. With CO adsorption a change of the electronic structure is observed: the adlayer loses metallicity and the CsRu stretch becomes visible. Strong changes of the CsRu stretch energies are observed with CO coverage.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
