PLEASE ANSWER ALL PARTS FOR THUMBS UP

A. (5 marks) What are the selection rules for Rotational Raman spectroscopy? Provide a phenomenological justification.

B. (5 marks) Describe the basic experimental setup required for Raman spectroscopy (A diagram will be sufficient)

C. (5 marks) Draw the energy-level-diagram for vibrational excitation of carbon tetrachloride. Show the transitions involved in Stokes and anti-Stokes transitions.

D. (5 marks) One of the fundamental vibrational modes of carbon tetrachloride (CCl4) occurs at 218 cm-1 . At what wavelength in nm would the Stokes and anti-Stokes vibrational Raman lines for this vibrational line appear if the excitation source was (i) a Helium/Neon laser (632.8 nm); (ii) an Argon Ion laser (488.0 nm).

E. (5 marks) How does the intensity of the Raman scattering depend on the frequency of the incident radiation? Assuming that the excitation sources in part (c) have the same power, estimate the relative intensities of the carbon tetrachloride Raman lines when each of the two excitation sources is used.

F. (5 marks) Calculate the ratio of the intensity of the anti-Stokes to the intensity of the Stokes line for (i) the 218 cm-1 line in carbon tetrachloride when the sample is at 20 C.