RelativeResourceManager(11) - Infrared and Raman...

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Infrared and Raman Spectrometry Chem 420 October 06, 2008 Professor Ryan C. Bailey
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Review session and test logistics z Review session: Tonight, 6-8 PM, 161 Noyes Lab z Exam date, time, and location: Wednesday, October 8, 12-12:50 PM z Last names beginning A-Mc : 217 Noyes Lab z Last names beginning Me-Z : 192 Lincoln Hall z Students will sit every other seat filling room from back z Exam begins promptly at 12 noon and ends at 12:50 PM. z Special situations need to notify me in advance to find solution. z Remember, you get one sheet of paper to write anything
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October 13, 2008 z CLASS CANCELED z Electroanalytical methods lecture pushed back to 10/15 z We’ll make up the day in the MS section
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Problem set #2 z Pickup after class by alphabetical order z Group 1: A-Mc z Group 2: Me-Z z Average=68.2 (80) z Key is available on-line z Grading issues must be contested in writing to Callie ( [email protected] ) within one week. You must provide your assignment by next Tuesday at one of her office hours (T, 9-10AM or Th, 12-1PM in 61 RAL).
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Recap from last class z What is the main difference between fluorescence and phosphorescence? z What are the major non- radiative relaxation processes? z What are some advantages and disadvantages of photoluminescent methods compared to absorbance-based measurements? z Greater inherent sensitivity, broader dynamic range; not all molecules luminesce z How is chemiluminescence different than photoluminescence?
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Questions???
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Infrared spectral regions () ( ) ( ) -1 4 Hz 1 μ m cm 10 cm μ mc m / s c ν λ =⋅ =
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What is IR measuring? z Radiation not energetic enough to promote electronic transitions, but rather vibrational and rotational motions z Absorption results in an increase in amplitude of the motion z Selection rule: Molecule (mode) must undergo a net change in dipole moment to be IR active
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Types of molecular vibrations z Vibration must cause a change in dipole moment z Stretches and bends
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Harmonic oscillator, Hook’s law and anharmonicity z Anharmonic oscillator on account of coulombic repulsion at short distances and dissociation at long distances. 2 1 2 F ky Ek y =− =
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Vibrational frequencies: IR and Raman z Vibrations are quantized—can only assume discrete energies z Vibrational energy levels are equally spaced and transitions can only occur if the vibrational quantum number changes by ± 1.
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This note was uploaded on 04/08/2010 for the course CHEM 420 taught by Professor Bailey during the Spring '08 term at University of Illinois at Urbana–Champaign.

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RelativeResourceManager(11) - Infrared and Raman...

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