2. Raman Spectroscopy EXCITED! C.V. Raman, 1928 One in 10 7 Inelastic scattering Of Light!

3. EXCITED! VIRTUAL Stokes and anti-Stokes

4. Polarizability

5. Polarizability Ellipsoid Polarizability in different directions are different! Use polarizability ellipsoid to represent this

6. Rotational Raman Effect Ellipsoid should not be a sphere! Initial state Final state

7. 6B10B14B 6B 10B 14B Stokes Anti-Stokes 20B 12B J 3 2 1 0 6B 2B 0 EJEJ 30B

8. Vibrational Raman Effect Polarizability ellipsoid should change shape

14. Vibrational-rotational Raman Effect

15. J 3 2 1 0 10B 6B 2B 0 EJEJ 6B10B14B6B10B14B J 3 2 1 0 10B 6B 2B 0 EJEJ Anti-Stokes SOQ

16. Mutual Exclusion of IR and Raman