Surface-enhanced Raman scattering as a ubiquitous vibrational probe of transition-metal interfaces: benzene and related chemisorbates on palladium and rhodium in aqueous solution
Article Abstract:
The vibration of adsorbates in benzene, toluene, benzonitrile, palladium and rhodium films in aqueous solution has been studied with a new surface-enhanced Raman scattering (SERS) technique. Toluene and benzonitrile were selected because of their similar molecular symmetry. The two transition metals were chosen because uniform films of known thickness can be made from them with constant-current deposition. Most of the adsorbate normal modes can be identified by using 'dynamic polarizability' surface selection rules followed by SERS. Chemisorbate structure and surface bonding can be known through Raman band intensities and adsorption frequency shifts.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Infrared spectroscopy of mixed nitric-oxide-carbon-monoxide adlayers on ordered iridium(111) in aqueous solution: a model study of coadsorbate vibrational interactions
Article Abstract:
The vibration and electrochemical properties of mixed saturated nitric oxide-carbon-monoxide layers (NO/CO) adlayers on iridium(111) in aqueous acidic solution has been studied with infrared spectroscopy. Vibrational frequency and intensity data are used in investigating the influence of intermolecular interactions on the infrared spectra. Results indicate that the NO/CO adlayers are molecularly intermixed in nature based on vibrational band frequency and intensity data. It can be concluded that truly segregated CO and NO domains do not exist in the adlayers.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Reduction kinetics of surface rhodium oxide by hydrogen and carbon monoxide at ambient gas pressures as probed by transient surface-enhanced Raman spectroscopy
Article Abstract:
A study was conducted to analyze the transient reduction kinetics associated with surface rhodium oxide by gaseous H2 and Co. Surface-enhanced Raman spectroscopy was carried out to perform the analysis. The rhodium films were made using disks cut from gold foils. The gas-phase composition was observed by leaking the reactor gas into a quadrupole mass spectrometer. Experimental results indicated the effectiveness of Raman spectroscopy in in situ surface chemical characterization studies.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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