skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
; ; ; ;  [1]
  1. The Institute for Solid State Physics, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8581 (Japan)
Publication Date:
OSTI Identifier:
22493723
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 144; Journal Issue: 5; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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