421-821-chapter-18

421-821-chapter-18 - Raman Spectroscopy A) Introduction 1.)...

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Raman Spectroscopy A) Introduction 1.) Raman spectroscopy : complimentary to IR spectroscopy . - radiation at a certain frequency is scattered by the molecule with shifts in the wavelength of the incident beam. - observed frequency shifts are related to vibrational changes in the molecule associated with IR absorbance. - Raman Scattering Spectrum Resembles IR absorbance spectrum a) IR Raman i. vibrational modes vibrational modes ii. change in dipole change in polarizability iii. excitation of molecule to momentary distortion of the excited vibrational state electrons distributed around the bond iv. asymmetric vibrations (active) symmetric vibrations (active) δ - + δ - extend compress
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2.) Basic Principals of Raman Spectroscopy : - light is scattered by the sample at various angles by momentary absorption to virtual state and reemission energy absorbed by molecule from photon of light not quantized No change in electronic states a a Infinite number of virtual states
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This note was uploaded on 05/09/2010 for the course CHEM 221 taught by Professor Dr.robertpowers during the Fall '07 term at San Diego.

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421-821-chapter-18 - Raman Spectroscopy A) Introduction 1.)...

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