587 2008 wk07 _Raman_ch 18 std

587 2008 wk07 _Raman_ch 18 std - Raman Spectroscopy Raman...

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1 Raman Spectroscopy Raman overview – 1928: C.V. Raman – 1931 Nobel Prize in physics • For his discovery and systematic explanation – Basics of Raman relative to Infrared – Stokes and Anti-Stokes Raman – Pros and Cons of using Raman Spectroscopy – Raman Instrumentation • Laser line excitation and Rayleigh line – Theory – Depolarization ratios and symmetry – Applications • Molecules • Solids and extent of crystallization • Sample size effects – Linear vs. nonlinear Raman spectroscopic methods IR versus Raman Gross Selection Rules Infrared Spectroscopy - Change in dipole moment during the vibrational transition Raman Spectroscopy - Change in polarizability during the vibrational transition *Group theory predicts whether a vibrational mode is infrared- or Raman-active What is measured? Infrared Spectroscopy - Measure the IR transmission (P/P 0 ) Raman Spectroscopy -Measure the scattered source light -
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2 Comparing IR and Raman Spectra Some vibrational modes will either be Raman or IR active. Raman Scattering http://www.raman.de/english/html/basics.htm Scattering can occur from a “virtual state” as opposed to a real electronic state (S 1 )
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3 Both IR & Raman (Stokes & anti-Stokes) provide vibrational information.
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This note was uploaded on 07/17/2008 for the course CHEM 587 taught by Professor Allen during the Spring '08 term at Ohio State.

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587 2008 wk07 _Raman_ch 18 std - Raman Spectroscopy Raman...

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