Linked from
The 51 pages that link to Raman spectroscopy, each with the reason it gives.
SpectroscopyBroader topic: It reveals vibrational information complementary to infrared absorption.
ScatteringBroader topic: The energy shifts in scattered photons reveal molecular structure.
Inelastic scatteringBroader topic: The shifted photon energies directly encode vibrational modes.
C. V. RamanBroader topic: The effect Raman discovered became the basis of this analytical method.