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Molecularly chemisorbed intermediate state to oxygen adsorption on Pd{1 1 0} by P. Junell; K. Honkala; M. Hirsimäki; M. Valden; K. Laasonen is a Physics and Astronomy article available to read on EtoBox.

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Translational energy (E T ) dependence of oxygen (O 2 ) adsorption on Pd{1 1 0} has been investigated with molecular beam surface scattering (MBSS) experiments. The initial sticking probability (S 0 ) and adsorption kinetics of oxygen are shown to depend strongly on E T of the incident molecule. An inverse surface temperature dependence of S 0 is also observed at low translational energies. Using density-functional theory calculations several O 2 adsorption potential energy curves (PECs) on Pd{1 1 0} were determined. Direct adsorption PECs with an activation barrier and two PECs with a molecular chemisorption state were found. Both experimental and theoretical results indicate a twofold adsorption mechanism. At low E T molecules end up in a very attractive molecularly chemisorbed precursor state from which they eventually dissociate. At higher E T more molecules begin to dissociate via a direct activated adsorption channel.

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Author

P. Junell; K. Honkala; M. Hirsimäki; M. Valden; K. Laasonen

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0039-6028)

Published

2003

Language

EN

Field

Physics and Astronomy (Physical Sciences)