Intro Raman Scattering

Scattering of Light: Raman Spectroscopy Deanna O’Donnell Informal P-Chem Review June 9 th , 2009

A review of light ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

History ,[object Object],[object Object],[object Object],[object Object],Sir. C.V. Raman

Raman Basics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Raman Basics ,[object Object],[object Object],[object Object],Stokes and Anti-stokes Raman Spectrum of CCl 4 E 1 E 0 Stokes Scattering Anti-Stokes Scattering Rayleigh Scattering   -  m   +  m   virtual states

More Raman Basics ,[object Object],[object Object],[object Object],Normal Raman  ≤ 10 0 Resonance Raman  ≥ 10 3 Energy  o = 500nm  o = 334nm

Signal Enhancement ,[object Object],[object Object],[object Object],[object Object],[object Object], i =  ij E j  i = induced electric dipole  ij = polarizability E = electric field of the iiiiiiiiii electromagnetic radiation I mn = I o (  o -  mn ) 4  |(  ij ) mn | 2 (  ij ) mn  (  em -  o ) -1 http://www.personal.dundee.ac.uk/~tjdines/Raman/RR3.HTM

Resonance Raman Intensity I mn = I o (  o -  mn ) 4  |(  ij ) mn | 2 (  ij ) mn  (  em -  o ) -1

Example of Frank-Condon Factors ,[object Object],Electronic structure of para aminophenoxyl radical in water - G. N. R. Tripathi A = Absorption Spectrum of p-aminophenoxyl radical

TR-RR Data Collection  scattered 440 nm ± 30 nm  incident 440 nm Background: H 2 O, sodium benzoate, t-butanol,KOH (pH = 13.2), degassed with N 2 Signal + Background: H 2 O, sodium benzoate, t-butanol, KOH (pH = 13.2), degassed with N 2 , and benzoate dianion

Good References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Intro Raman Scattering

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Intro Raman Scattering