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Full set of Notes with Fill-Ins - San Jose State University

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Chem 155 Unit 15 269 <strong>of</strong> 316Some general points regarding Raman:Pro: Raman uses visible light:OpticsSolventsBiological samplesImaging <strong>with</strong> Raman has better spatial resolutionbecause <strong>of</strong> the shorter wavelengths used.Microscopes can be used in ‘Raman microprobe’mode.Silver and gold particles or rough surfaces can verystrongly enhance Raman scattering.Different vibrational modes can be seen (e.g.centrosymmetric)1ν vib ⋅2πkμVery low frequency modes are accessible (e.g.inorganics):Depolarization ratio can distinguish betweensymmetric and asymmetric stretches.Page 269 <strong>of</strong> 316

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