Istituto dei materiali per l'elettronica ed il magnetismo     
Savio L., Vattuone L., Rocca M. Role of steps and terrace width in gas-surface interaction: O2/Ag(410). In: Physical Review Letters, vol. 87 (27) article n. 276101. The American Physical Society, 2001.
We demonstrate by vibrational spectroscopy that open steps are the active site for O-2 dissociation on Ag(410), and that the barrier to adsorption at defects can be measured by energy and angle resolved investigation of the dynamics of the gas-surface interaction. We identify a molecular adsorption channel with considerably reduced activation barrier and a nonactivated dissociative pathway. The O-2 sticking probability is increased at steps and strongly reduced at terraces with respect to Ag(100), implying that reactivity is influenced by terrace width.
URL: http://link.aps.org/doi/10.1103/PhysRevLett.87.276101
DOI: 10.1103/PhysRevLett.87.276101
Subject 82.65.+r, 68.35.Dv, 68.43.Pq

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