A spectroelectrochemical cell for ultrafast two-dimensional infrared spectroscopy.
Rev Sci Instrum
; 86(8): 083102, 2015 Aug.
Article
em En
| MEDLINE
| ID: mdl-26329169
ABSTRACT
A spectroelectrochemical cell has been designed to combine electrochemistry and ultrafast two-dimensional infrared (2D-IR) spectroscopy, which is a powerful tool to extract structure and dynamics information on the femtosecond to picosecond time scale. Our design is based on a gold mirror with the dual role of performing electrochemistry and reflecting IR light. To provide the high optical surface quality required for laser spectroscopy, the gold surface is made by electron beam evaporation on a glass substrate. Electrochemical cycling facilitates in situ collection of ultrafast dynamics of redox-active molecules by means of 2D-IR. The IR beams are operated in reflection mode so that they travel twice through the sample, i.e., the signal size is doubled. This methodology is optimal for small sample volumes and successfully tested with the ferricyanide/ferrocyanide redox system of which the corresponding electrochemically induced 2D-IR difference spectrum is reported.
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1
Base de dados:
MEDLINE
Assunto principal:
Espectrofotometria Infravermelho
/
Eletroquímica
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article