Lecture06A - Lecture 6 1 Partition Functions (17.3, 4, 5)...

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Unformatted text preview: Lecture 6 1 Partition Functions (17.3, 4, 5) (Believe it or not) There is more to life than monatomic ideal gases. In Chapter 18 we will derive the details, but for now lets consider an ideal diatomic molecule (rigid rotor harmonic oscillator approx.). The molecular partition function has 3 parts: ( 29 3/2 2 /2 2 2 2 8 , 1 hv hv m I e q V V h h e -- = - Our old friend: translation for an ideal gas molecule of mass m. I = moment of inertia v = harmonic frequency ( 29 ( 29 , As before: , , ! N q V Q Q N V N = = Lecture 6 2 ( 29 2 ln ln ln ! 3 3 2 ln ln ln 1 ln ... 2 2 2 hv Q N q N N hv m N N N e N h - =- = ----- + + other terms without , ln 3 2 2 1 hv hv N V Q N N Nhv Nhve E U e -- = - = + + + = - / / 3 2 2 1 B B hv k T B B hv k T Nhv Nhve U Nk T Nk T e-- = + + +- A A / / For N=N (1 mole), and N 3 2 2 1 B B B hv k T A A hv k T k R N hv N hve U RT RT e-- = = + + +- Translational energy Rotational energy Zero-point energy Vibrational (beyond zero-point) energy As we might have anticipated, Energy is distributed among the...
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This note was uploaded on 04/08/2010 for the course CHEM 444 taught by Professor Jameslis during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Lecture06A - Lecture 6 1 Partition Functions (17.3, 4, 5)...

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