The adsorption of benzene on Rh(lll) was investigated by using low-energy electron diffraction (LEED), thermal desorption spectroscopy (TDS), and angle-resolved ultraviolet photoelectron spectroscopy (ARUPS).Under very good vacuum conditions we found a (\/l9 x \/l9)R23.4°pure benzene adsorption structure which could be converted to the c(2-3 x 4)rect and (3 x 3) structures by admission of CO. The adsorption symmetry, the possible adsorption sites, the orientation of the benzene molecules, and the molecular interaction in the adsorbate layer were investigated with ARUPS. The structure exhibits a work function change of Ae(i> = -1.47 eV, indicating one of the highest benzene densities on Rh(l 11) observed so far. A considerable dispersion of the 2aig-derived band of the adsorbate layer was observed.
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