April08_2005_2pp

April08_2005_2pp - April 8, 2005 Decision Time: Monday or...

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1 April 8, 2005 ¾ Decision Time: Monday or Tuesday Review Session for Exam #3 ¾ Problem Set #4 Solutions – still coming soon! 2 Raman Properties ¾ Get vibrational spectrum 9 complementary with IR 9 can use UV/Vis instrumentation 9 aqueous solutions are accessible to study ¾ Problems 9 Low efficiency of effect = poor sensitivity 9 Competition from fluorescence for highly fluorescent species
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3 Solving Problems ¾ Resonance Raman 9 Selectivity and Detectability ¾ Surface-Enhanced Raman 9 Selectivity and Detectability ¾ Multi-Channel Detection 9 Detectability ¾ Near-IR Excitation 9 Fluorescence Rejection 4 Resonance Raman ¾ If λ incident corresponds to a strong absorption band, I Raman enhanced by 10 2 –10 6 x ν incident ν stokes Enhancement only for vibrational modes associated with portion of molecule involved in electronic transition. How does this differ from fluorescence?
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5 Surface Enhanced Raman Spectroscopy (SERS) ¾ Raman signal enhancement occurs if sample is on an “active metal” surface • “active metal” = Ag, Au, Cu, and others • a generalizable phenomenon (SEIRA)
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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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April08_2005_2pp - April 8, 2005 Decision Time: Monday or...

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