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CHEM 550 Homework #10 – Infrared Spectroscopy 1. When doing Raman spectroscopy the Stokes lines are typically the scattered light that is monitored for the measurements. Why are the Stokes lines measured rather than the antiStokes lines? 2. What would happen to the relative intensities of the Stokes and anti-Stokes lines as the temperature of the molecule being measured was: a) Increased? b) Decreased? 3. Why can Raman spectroscopy be applied to the analysis of aqueous solutions when IR cannot? 4. Draw and label the electronic transitions on an energy level diagram that would provide the signal seen for the scattering below: Just show the most likely transitions for each of the shifts. 5. Why do the anti-Stokes lines in shown in the figure of problem #4 decrease in intensity the further they are shifted from the excitation wavelength? 6. A

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