Optical second harmonic generation from a catalytically active molybdenum electrode

Second harmonic generation (SHG) from an electrochemically controlled Mo surface is detected by using 7 ns laser pulses at a fundamental wavelength of 1064 nm. When this electrode is used as a catalytic support for hydrogen evolution, the optical signal shows a correlation with the reaction current....

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Bibliographic Details
Published in:Applied surface science 1998-09, Vol.135 (1-4), p.46-52
Main Authors: Lovell, M.A., Roy, D.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Double layer
Electrocatalysis
Exact sciences and technology
Metals. Metallurgy
Molybdenum
Nonlinear susceptibility
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of specific thin films
Optical properties of specific thin films, surfaces, and low-dimensional structures
Physics
Second harmonic generation
Surface electron density
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Summary:Second harmonic generation (SHG) from an electrochemically controlled Mo surface is detected by using 7 ns laser pulses at a fundamental wavelength of 1064 nm. When this electrode is used as a catalytic support for hydrogen evolution, the optical signal shows a correlation with the reaction current. Considerations of surface kinetics indicate that this observed correlation is a result of free electron-mediated changes in surface conditions. The results of this work reinforce the currently recognized utility of SHG as a probe of reactive metal surfaces. These new data for Mo also contribute to the expansion of the presently known domain of SHG studies of electrochemical systems.
ISSN:0169-4332
1873-5584
DOI:10.1016/S0169-4332(98)00307-9