Six-dimensional quantum treatment of the vibrations of diatomic adsorbates on solid surfaces: CO on Cu(100)

Atul Bahel, Zlatko Bacic

Research output: Contribution to journalArticle

Abstract

Computational methodology for exact quantum 6D calculations of the vibrational eigenstates, energy levels, and wave functions of a diatomic molecule adsorbed on a rigid corrugated surface is presented. It is intended for adsorbates executing coupled, strongly anharmonic large-amplitude vibrations. Surface nonrigidity is introduced in an approximate way, by means of a simplified surface-mass model. Using this methodology, we calculate the vibrational levels of CO/Cu(100) for all four isotopomers of CO, 12C16O, 13C16O, 12C18O, and 13C18O. The empirical potential by Tully and co-workers [J. C. Tully, M. Gomez, and M. Head-Gordon, J. Vac. Sci. Technol. A 11, 1914 (1993)] is employed. Our calculated fundamental frequencies of CO/Cu(100) vibrations are compared to those from earlier theoretical treatments on the same potential, as well as with the experimental frequencies and isotope frequency shifts. In addition to 6D calculations, we perform 5D (rigid CO) and 4D (fixed-site) quantum calculations, which provide information about the couplings among the vibrational modes of CO on Cu(100). Excited levels of the lowest-frequency in-plane (doubly degenerate) frustrated translation mode are analyzed and assigned.

Original languageEnglish (US)
Pages (from-to)11164-11176
Number of pages13
JournalJournal of Chemical Physics
Volume111
Issue number24
StatePublished - Dec 22 1999

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Adsorbates
Carbon Monoxide
solid surfaces
vibration
methodology
diatomic molecules
frequency shift
vibration mode
flexibility
eigenvectors
isotopes
energy levels
wave functions
low frequencies
Wave functions
Isotopes
Electron energy levels
Molecules

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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Six-dimensional quantum treatment of the vibrations of diatomic adsorbates on solid surfaces : CO on Cu(100). / Bahel, Atul; Bacic, Zlatko.

In: Journal of Chemical Physics, Vol. 111, No. 24, 22.12.1999, p. 11164-11176.

Research output: Contribution to journalArticle

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