Probing the charge-transfer state of CO on Pt(111) by two-dimensional infrared-visible sum frequency generation spectroscopy

K. C. Chou; S. Westerberg; Y. R. Shen; P. N. Ross; G. A. Somorjai

doi:10.1103/PhysRevB.69.153413

Probing the charge-transfer state of CO on Pt(111) by two-dimensional infrared-visible sum frequency generation spectroscopy

K. C. Chou, S. Westerberg, Y. R. Shen, P. N. Ross, and G. A. Somorjai

Phys. Rev. B 69, 153413 – Published 30 April 2004

Abstract

The lowest charge-transfer band of CO on Pt(111) was identified using two-dimensional infrared-visible sum frequency generation spectroscopy. The electronic resonance associated with the stretching mode of atop CO appeared at 2.51 eV with a bandwidth of 0.83 eV. The result is consistent with earlier calculations using CO-Pt cluster models indicating that the resonance is from $5 d$ to $6 s p$ orbital of Pt hybridized with orbital of CO. The measured transition energy suggests that the antibonding state of Pt $6 s p$ and CO $5 σ$ for atop CO on Pt(111) is $\sim 2.2 eV$ above Fermi level.

Received 25 November 2003

DOI:https://doi.org/10.1103/PhysRevB.69.153413

Authors & Affiliations

K. C. Chou^1,3,*, S. Westerberg^1,3, Y. R. Shen^2,3, P. N. Ross³, and G. A. Somorjai^1,3,†

¹Department of Chemistry, University of California, Berkeley, California 94720, USA
²Department of Physics, University of California, Berkeley, California 94720, USA
³Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

^*Address after July 2004: Department of Chemistry, University of British Columbia, Vancouver, Canada.
^†Electronic address: somorjai@socrates.berkeley.edu

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Vol. 69, Iss. 15 — 15 April 2004

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