Raman Flashcards
Want are the types of scattering when a photon and molecule collide
Elastic and inelastic
What is elastic scattering
No change in energy - Rayleigh line
What is inelastic scattering
Raman
What is it called when the photon gains energy
Anti stokes
How does a Raman spectra work
Very strong laser pointed at cell causes scattering in many directions monochrometer selects one v
Which side does the anit stoke line lie
Right
What is the gross selection rule
Change in polarizabilty on vibration or rotation
What is an isotopic ellipsoide
Same polarizabilty in all directions e.g. Spherical rotors
What is the specific selection rule for rotational Raman
+-2,0
What is the selection rule for vibrational Raman
-+1
Why is the anti stokes band normally weak
Low population in 1 most are in 0
What is the mutual exsculison principle
If a molecule has a centre of inversion it’s Raman active cannot be IR Active
