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期刊论文
High-resolution electron energy loss spectroscopy and angle-resolved ultra-violet photoemission spectroscopy studies of carbon monoxide on a Cs-precovered Ru(10(1)over-bar-0) surface
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There are two molecular adsorption states of CO in the CO + Cs/Ru(<10(1)over bar 0>) system. One is alpha(1)-CO, with lower C-O frequency, and the other is alpha(2)CO, with higher C-O frequency. The latter is similar to that on a clean Ru(<10(1)over bar 0>) surface. The two states of CO are occupied sequentially during the exposure to CO. The C-O stretch frequency of both states shifts to a higher value with the exposure to CO and to a lower value with higher Cs precoverage. The electronic structure of the alpha(1)-CO molecule is different from that of the alpha(2)-CO molecule and is of the same character as CO in a tilted mode.
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