Spectroscopic techniques

Question 1

Raman spec

Answer 1

a form of vibrational spectroscopy using deflected light, scattering protons

Question 2

photons

Answer 2

interact with molecular vibrations in a material and are scattered
are little packets of energy

Question 3

Types of scattering

Answer 3

1. elastic - leave in the same state as they entered (Rayleigh 10^7)
2. inelastic - leaves the molecule in a different quantum state (Raman 1)

Question 4

types of raman

Answer 4

1. stokes - photon/ light comes in, loses energy to molecule
2. anti stokes - light comes in and takes energy from molecule

Question 5

molecular vibrations

Answer 5

• change in polarisation = Raman active
• change in dipole moment = IR active

Question 6

Raman vs IR

Answer 6

light scattering / IR absorption
change in polarisability / change in absorption
aqueous sample / non aqueous
little to no sample prep / sample prep