text: 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. 
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