Differentiate between IR spectra and Raman spectra.

Infrared (IR) spectroscopy and Raman spectroscopy are both powerful analytical techniques used to study molecular vibrations in materials, but they employ different principles and offer distinct advantages.

1. Principle: 
   - IR spectroscopy measures the absorption of infrared radiation by molecular vibrations. It analyzes the energy absorbed when molecules undergo vibrational transitions.
   - Raman spectroscopy measures the scattering of monochromatic light by molecular vibrations. It detects _________ _______ ____ ____ _________ _______ __________ ___ ___ __________ _________.
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