Abstract
We have studied adsorption of CO on Fe 3O 4(1 1 1) films grown on a Pt(1 1 1) substrate by temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and high resolution electron energy loss spectroscopy (HREELS). Three adsorption states are observed, from which CO desorbs at ∼110, 180, and 230 K. CO adsorbed in these states exhibits stretching frequencies at ∼2115–2140, 2080 and 2207 cm −1, respectively. The adsorption results are discussed in terms of different structural models previously reported. We suggest that the Fe 3O 4(1 1 1) surface is terminated by 1/2 ML of iron, with an outermost 1/4 ML consisting of octahedral Fe 2+ cations situated above an 1/4 ML of tetrahedral Fe 3+ ions, in agreement with previous theoretical calculations. The most strongly bound CO is assigned to adsorption to Fe 3+ cations present on the step edges.
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