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Discussion

Raman spectroscopy observes light that has been

  • A.reflected from the sample's surface
  • B.scattered with a change of frequency
  • C.absorbed and then re-emitted at the same frequency
  • D.transmitted without any interaction

Answer: B

A small fraction of the scattered photons gain or lose a vibrational quantum, and the shift rather than the absolute frequency carries the information. The much stronger unshifted Rayleigh scattering must be filtered out.

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