Dissociative adsorption of O2 on Cu(110) and Cu(100)

Three-dimensional quantum dynamics studies

Jiu Yuan Ge, Jiqiong Dai, John Zhang

Research output: Contribution to journalArticle

Abstract

The dynamics of dissociative chemisorption of oxygen on Cu(110) and Cu(100) has been studied using a time-dependent quantum wave-packet approach. Dissociation probabilities for O2 on both (110) and (100) surfaces of copper are calculated for ground state as well as rovibrationally excited oxygen molecules. The present calculation simulates O2 dissociation on nascent copper surfaces with no consideration for surface reconstruction. The dynamics calculation is based on a flat-surface model in which three molecular degrees of freedom are explicitly included while the lateral coordinates of the molecule are neglected. The interaction potential energy surface (PES) for the dynamics calculation is constructed using the LEPS (London-Erying-Polyni-Sato) PES form with potential parameters fitted to some available experimental and theoretical data. The barrier of the LEPS PES for oxygen dissociation on copper is 0.11 eV for Cu(110) and 0.08 eV for Cu(100). Relatively speaking, the saddle point of the O2/Cu(110) PES is located near the entrance channel, while that of the O2/Cu(100) is near the product channel. This feature is primarily responsible for the difference in calculated dissociation probabilities of oxygen on two surfaces. Specifically, the dissociation probability of O2 on Cu(110) is large and less sensitive to the vibrational excitation of the molecule, while that of O2 on Cu(100) is much smaller and more sensitive to vibrational excitation of the molecule.

Original languageEnglish (US)
Pages (from-to)11432-11437
Number of pages6
JournalJournal of Physical Chemistry
Volume100
Issue number27
StatePublished - Jul 4 1996

Fingerprint

Potential energy surfaces
Adsorption
adsorption
Oxygen
Copper
Molecules
dissociation
potential energy
oxygen
Wave packets
copper
Surface reconstruction
molecules
Chemisorption
Ground state
saddle points
entrances
wave packets
chemisorption
excitation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Dissociative adsorption of O2 on Cu(110) and Cu(100) : Three-dimensional quantum dynamics studies. / Ge, Jiu Yuan; Dai, Jiqiong; Zhang, John.

In: Journal of Physical Chemistry, Vol. 100, No. 27, 04.07.1996, p. 11432-11437.

Research output: Contribution to journalArticle

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