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Abstract
We have investigated the interactions of propene with Ag(1 1 1) by means of temperature programmed desorption (TPD) and reflection adsorption infrared spectroscopy (RAIRS). At 100 K, propene reversibly adsorbs, with desorption peaks at 161 K (α 1 state), 145 K (α 2 state) and 123 K (α 3 state) sequentially populated as the coverage increases. These are ascribed to two slightly different adsorption states involving Ag (α 1 and α 2) and multilayer (α 3), respectively. Repulsive interactions drive a change from α 1- to α 2-propene during adsorption and desorption. The three adsorption states are distinguished by RAIRS on the basis CH 2 wagging vibration frequencies at 924, 918 and 908 cm −1, respectively. Relative intensities demonstrate that the plane containing the three carbon atoms lies nearly parallel to the Ag(1 1 1) surface for the α 1 and α 2 adsorption states but is tilted away for the multilayer α 3 adsorption state.
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