CHEM 433 – 9/13/11
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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. 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. - PowerPoint PPT Presentation
Transcript of 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
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
Puck in a rink
Nuclei held by bonds
e– held by nuclei
E ~ largeE ≥ kT
E ~ 0“continuum”
“Scales” of various types of energy levels
Translational Rotational(Diatomic)
Vibrational(Diatomic)
Electronic(H atom)
A
“contin
uum
”…
E=0
v=1
J=0 (1)
J=1 (3)
J=2 (5)
J=3 (7)
v=0
v=2
v=4
0
12B
6B
2B
v=3
3/2e
5/2e
7/2e
9/2e
~1 cm-1
~1000 cm-1
>10,000 cm-1:(~80,000 here)
} }
-RH/4
-RH/9
n=2
n=3
E
E=0!
An Interesting link …
http://www.chm.davidson.edu/chemistryapplets/KineticMolecularTheory/Maxwell.html
