Stimulated Raman scattering observation in carbon tetrachloride, benzene and ethanol

In this research was implemented the Raman spectroscopy for the observation of stimulated Raman spectra in liquids. The behavior of the vibrational normal modes for the molecules of carbon tetrachloride, benzene and ethanol was analyzed, observing for the case of benzene and ethanol the anti-Stokes Raman scattering for one normal modes vibration. The stimulated Raman spectra of these substances were generated using a Nd:YAG laser operated at 532 nm, energy by pulse of 80 mJ, 3-5 ns pulse duration and 5 Hz of frequency. The laser radiation was focused in the liquid contained in a quartz cuvette of 1 cm path length with a spherical lens of 10 cm focal distance. The scattering radiation by the sample was collected perpendicularly with an optical fiber of 2 m in length and conducted through of entrance slit to a Czerny-Turner mounting spectrograph 0.25 m, equipped with a diffraction grating of 1200 grooves/mm and 2048 pixels CCD detector. For the attenuation of Rayleigh scattering was used a Notch filter at 532 nm in the entrance slit to a spectrograph.