Raman - Chapter 18: Raman Spectroscopy Homework: Compare...

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Chapter 18: Raman Spectroscopy Homework: Compare the selection rules and instrumentation involved in IR and Raman spectroscopies. List a molecule that is IR active but not Raman active and vice versa. Intensity Raman Shift (cm -1 ) 0 +100 +200 +300 -100 -200 -300 Rayleigh Stokes Anti-Stokes Visible excitation, Scattered light detected
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Chapter 18: Raman Spectroscopy Discovered by C. V. Raman in 1928 (Nobel in 1931) Highly complimentary to IR: IR inactive groups can be Raman active and vice versa Water can be used as solvent Glass or quartz cells can be used in place of salt plates or fused silica
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Chapter 18: Raman Spectroscopy Visible or NIR Light Inelastic Light Scattering
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Raman Spectroscopy is a Light Scattering Technique When light encounters molecules in the air, the predominant mode of scattering is elastic scattering, called Rayleigh scattering . This scattering is responsible for the blue color of the sky. Elastic means the photon energy does not change when it hits and is re-radiated. No Atmosphere, No color Atmosphere, Rayleigh Scattering, Color Rayleight Scattering Intensity 1/ λ 4 ; Blues scattered the most
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Raman Spectroscopy is a Light Scattering Technique It is also possible for the incident photons to interact with the molecules in such a way that energy is either gained or lost so that the scattered photons are shifted in frequency. Such
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Raman - Chapter 18: Raman Spectroscopy Homework: Compare...

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