Spectroscopy {Raman spectroscopy} can study plastics, waxes, pure organic molecules, complex ions, or non-spherical molecules, by polarizing non-polar bonds with UV or visible light and analyzing infrared radiation.
scattering
UV or visible light scatters from molecules to polarize them, with +2 or -2 total angular momentum. Rayleigh scattering is elastic, with unchanged wavelength. Raman scattering is inelastic, because it makes dipoles, so vibration and rotation energy levels affect it.
polarization
Polarization causes infrared-light emission or absorption at vibration or rotation energies. Raman-scattering vibrations are not infrared. Raman-scattering rotations are infrared. Raman lines can have lower frequency {Stokes line} or higher frequency {anti-Stokes line}.
Physical Sciences>Chemistry>Analytical Chemistry>Spectroscopy
5-Chemistry-Analytical Chemistry-Spectroscopy
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Date Modified: 2022.0224