Structure and reactions of carbon and hydrogen on Ru(0001): a scanning tunneling microscopy study.
The interaction between carbon and hydrogen atoms on a Ru(0001) surface was studied using scanning tunneling microscopy (STM), density functional theory (DFT) and STM image calculations. Formation of CH species by reaction between adsorbed H and C was observed to occur readily at 100 K. When the coverage of H increased new complexes of the form of CH+nH (n=1, 2, and 3) were observed. These complexes, never observed before, might be precursors for further hydrogenation reactions. DFT analysis reveals that a considerable energy barrier exists for the CH+H-->CH(2) reaction.
Shimizu
Tomoko K
TK
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Mugarza
Aitor
A
Cerdá
Jorge I
JI
Salmeron
Miquel
M