April06_2005_2pp

April06_2005_2pp - April 6, 2005 Think about: Monday or...

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1 April 6, 2005 ¾ Think about: Monday or Tuesday Review Session for Exam #3 ¾ Problem Set #4 Solutions – coming soon! Spectroscopy: Raman Spectroscopy Chem 221 Instrumental Analysis Spring 2005
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3 Raman Scattering ¾ Discovered in 1928 by C.V. Raman (received Nobel Prize in 1930) Ground State Excited State “Virtual” State First, let’s look at Elastic (Rayleigh) scattering (no change in energy of light): EMR induces oscillating electric field in electron cloud around molecule – which is then re-emitted as a photon 4 Inelastic Scattering • If there is a vibration which results in a change in the net polarizability of the electron cloud: Scattered photon will be at an energy either greater than or lower than the original energy by an amount equal to the energy of the vibration: Inelastic Scattering (Only about 1 molecule in 10 8 –10 9 will inelastically scatter photons)
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5 Quantum View Stokes Lines: longer wavelength
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This note was uploaded on 05/15/2010 for the course CHEM 221 taught by Professor Joelgoldberg during the Spring '10 term at UVM.

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April06_2005_2pp - April 6, 2005 Think about: Monday or...

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