Observation of Fano line shapes in infrared vibrational spectra of CO{sub 2} adsorbed on Cu(997) and Cu(111)

Journal Article · Sun Feb 07 04:00:00 EST 2016 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4941060· OSTI ID:22493723

Koitaya, Takanori; Shiozawa, Yuichiro; Mukai, Kozo; Yoshimoto, Shinya; Yoshinobu, Jun ^[1]

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1. The Institute for Solid State Physics, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)

Adsorption states of carbon dioxide on the Cu(997) and Cu(111) surfaces were investigated by infrared reflection absorption spectroscopy, temperature programmed desorption, and X-ray photoelectron spectroscopy. CO{sub 2} molecules are physisorbed on the Cu(997) surface at temperatures below 70 K; neither chemisorption nor dissociation of CO{sub 2} occurs on the Cu(997) surface at this low temperature. However, the vibrational spectra of adsorbed CO{sub 2} depend significantly on the substrate temperature and coverage. IR spectra of CO{sub 2} vibrational modes at 70 K show asymmetric Fano line shapes, while only normal absorption bands are observed when CO{sub 2} is adsorbed at 20 K. Fano line shapes are also observed for CO{sub 2} on Cu(111) at 85 K. The observation of Fano effect indicates the coupling between the electronic continuum states of the Cu surface and the internal vibrational modes of CO{sub 2} even in such physisorbed system.

• OSTI ID: 22493723
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 5 Vol. 144; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
ADSORPTION
CARBON DIOXIDE
CHEMISORPTION
COPPER
COUPLING
DESORPTION
DISSOCIATION
INFRARED SPECTRA
MOLECULES
REFLECTION
SUBSTRATES
SURFACES
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES
X-RAY PHOTOELECTRON SPECTROSCOPY