Sample cells for probing solid/liquid interfaces with broadband sum-frequency-generation spectroscopy.
Rev Sci Instrum
; 81(6): 063111, 2010 Jun.
Article
em En
| MEDLINE
| ID: mdl-20590229
ABSTRACT
Two sample cells designed specifically for sum-frequency-generation (SFG) measurements at the solid/liquid interface were developed one thin-layer analysis cell allowing measurement of films on reflective metallic surfaces through a micrometer layer of solution and one spectroelectrochemical cell allowing investigation of processes at the indium tin oxide/solution interface. Both sample cells are described in detail and data illustrating the capabilities of each are shown. To further improve measurements at solid/liquid interfaces, the broadband SFG system was modified to include a reference beam which can be measured simultaneously with the sample signal, permitting background correction of SFG spectra in real time. Sensitivity tests of this system yielded a signal-to-noise ratio of 100 at a surface coverage of 0.2 molecules/nm(2). Details on data analysis routines, pulse shaping methods of the visible beam, as well as the design of a purging chamber and sample stage setup are presented. These descriptions will be useful to those planning to set up a SFG spectrometer or seeking to optimize their own SFG systems for measurements of solid/liquid interfaces.
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1
Base de dados:
MEDLINE
Assunto principal:
Análise Espectral
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article