Abstract
Co-adsorption of CO and potassium on Fe(110) is investigated by HREELS. We find three CO adsorption states, with different C-O stretching frequencies. When θk=0.03, the three loss peaks are ascribed to three kinds of interactions i.e., short-range, medium-range and long-range interaction. When θk = 0.06, the long-range interaction adsorption state disappears, but the short-range state dominats. All C-O stretching frequencies shift to higher wavenum-ber with the increasing of CO exposure. CO-Fe loss peak disappears with the increasing of potassium atoms on the surface.
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