page_title: Raman spectroelectrochemistry
section_title: Configuration
hierarchical_section_title: Raman spectroelectrochemistry / Configuration
caption_attribution_description: Español: Configuraciones de Raman-SEC. La primera imagen muestra la configuración normal, la segunda la configuración de microscopio invertido y la última la configuración angular. Todas ellas se muestran sobre electrodos serigrafiados.
context_page_description: Raman spectroelectrochemistry is a technique that studies the inelastic scattering or Raman scattering of monochromatic light related to chemical compounds involved in an electrode process. This technique provides information about vibrational energy transitions of molecules, using a monochromatic light source, usually from a laser that belongs to the UV, Vis or NIR region. Raman spectroelectrochemistry provides specific information about structural changes, composition and orientation of the molecules on the electrode surface involved in an electrochemical reaction, being the Raman spectra registered a real fingerprint of the compounds.
  When a monochromatic light beam samples the electrode/solution interface, most of the photons are scattered elastically, with the same energy than the incident light. However, a small fraction is scattered inelastically, being the energy of the laser photons shifted up or down. When the scattering is elastic, the phenomenon is denoted as Rayleigh scattering, while when it is inelastic it is called Raman scattering.
context_section_description: Different configurations can be used to perform Raman-SEC experiments. Raman scattering provides spectra with very weak Raman bands, therefore, a very well aligned optical configuration is required. Laser has to be focused on the electrode surface and an efficient collection of the scattered photons is mandatory. Many of the instruments used for Raman-SEC are based on the combination of a spectrometer, a potentiostat and a confocal microscope, since it is possible to focus and collect the scattered photons in a highly efficient way.  Low resolution Raman spectrometers can be also used, providing suitable results. Using this setup, the sampling area is larger and average information about the electrode surface is obtained.
  Typical configurations in Raman-SEC:
  Normal configuration. The laser beam samples the electrode/solution interface in a normal way respect to the electrode surface.  The scattered radiation is collected, and the monochromator allows passing only the light beam with wavelengths different from that of the laser used.
  Inverted microscope. In this configuration the electrode/solution is sampled from behind the electrode, using optically transparent electrodes (OTE). 
  Angular configuration. This configuration is usually selected when electrochemical techniques are combined with TERS.
caption: Raman-SEC configurations. The first picture shows the normal arrangement, the second the inverted microscope configuration and the last the angle arrangement. All of them are shown on screen-printed electrodes.
exif: {}