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CHEM 433 – 9/13/11

CHEM 433 – 9/13/11. I. Introductory Topics B. Molecules and Energy (Ch. 0) - How do molecules Store energy? —> Quantization (or not …) - How does E Storage relate to T? —> Boltzmann Distribution Read: Finish Chapter “0”, start IMF handout HW #1 Due: Th.

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CHEM 433 – 9/13/11

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  1. CHEM 433 – 9/13/11 I. Introductory Topics B. Molecules and Energy (Ch. 0) - How do molecules Store energy? —> Quantization (or not …) - How does E Storage relate to T? —> Boltzmann Distribution Read: Finish Chapter “0”, start IMF handout HW #1 Due: Th

  2. Energy Quantization: The general Idea is that the smaller the particle, and the more tight its confines are, the larger the SPACINGS between ENERGY LEVELS… E E ~ 0 “continuum” E ≥ kT E ~ large Puck in a rink Nuclei held by bonds e– held by nuclei

  3. “Scales” of various types of energy levels Rotational (Diatomic) Vibrational (Diatomic) Electronic (H atom) Translational E=0! J=3 (7) 12B -RH/9 n=3 9/2we v=4 7/2we v=3 -RH/4 n=2 E A “continuum”… J=2 (5) 6B 5/2we v=2 >10,000 cm-1: (~80,000 here) 3/2we v=1 J=1 (3) 2B ~1000 cm-1 } ~1 cm-1 } v=0 J=0 (1) 0 E=0

  4. An Interesting link … http://www.chm.davidson.edu/chemistryapplets/KineticMolecularTheory/Maxwell.html

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