Lecture 11 - Molecules with Internal Motion 1)...

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Molecules with Internal Motion 1) Intermolecular interactions are negligible 2) Classical gas   3 1 n  1 (1) 1 trans int nuc rot int elec vib ( , ) ! ( , ) N N Q Q V T N Q V T Q Q Q Q Q Q Q  For example diatomic molecules: 6 degrees of freedom for the 2 nuclei 3 translations for center of mass 1 vibration along the axis 2 rotations of the axis in space ( , )  Diatomic Molecules dissociation 45 10 10 10 kT E K TK     Practically no molecule in the excited state as well (exception oxygen at 2000 6000  ) diss 55,000 EK but excited 11000  Vibrational States 3 K k Almost full contribution for 4 10 T No contribution for 2 10 T Temperature is not high enough to excite vibrational states of high energy— harmonic oscillation. Partition Function: 1 2 vib 0 n n Qe     
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    v v 2 / v vv vib / 2 ; 1 T T e C Nk Tk e          vib vib 0
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This note was uploaded on 09/28/2011 for the course PHYSICS 971 taught by Professor Chakabarti during the Spring '10 term at Kansas State University.

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Lecture 11 - Molecules with Internal Motion 1)...

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