3. A student built a Raman spectroscopic system that could measure both Stokes-Raman and Anti-Stokes Raman scattering of

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3 A Student Built A Raman Spectroscopic System That Could Measure Both Stokes Raman And Anti Stokes Raman Scattering Of 1 (103.46 KiB) Viewed 23 times

3. A student built a Raman spectroscopic system that could measure both Stokes-Raman and Anti-Stokes Raman scattering of molecules. The whole scattering spectrum of CCl, obtained with the instrument is shown below. Answer the following questions. [30 pt] -218 cm - 314 cm - 459 cm t+790 vn- + 762 cm », +459 cm 7, +314 cm C +218 cm - 762 cm 790 cm Stokes Raman bands (type D,-) anti-Stokes Raman bands (type 0, +UM) Rayleigh hand, (c) A. If the Raman scattering of CCl4 was obtained with a 532 nm laser, what will be the shortest and the longest wavelengths of the Raman scattered light of CCl4? [10 pt] B. Based on the results in (A), suggest a proper detector for your Raman instrument. Justify your answer. [5 pt] C. If a notch filter was used to block the Rayleigh scattering with a 532 nm laser excitation but allow for both Stokes-Raman and Anti-Stokes Raman scattering, sketch the transmission spectrum of the notch filter that shows % transmission vs. wavelength. Indicate the wavelength scale on the graph. [5 pt] D. If you use a 785 nm laser instead, describe how the whole scattering spectrum of CCl4 will change (i.e. the wavelength range and relative Raman scattering intensities). [10 pt]