Manfra25-2011

Manfra25-2011 - CHAPTER 10 Molecules and Solids 10.1...

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10.1 Molecular Bonding and Spectra 10.3 Structural Properties of Solids CHAPTER 10 Molecules and Solids Molecules and Solids Johannes Diderik van der Waals (1837 – 1923) “You little molecule!” - Fred Flintstone (insulting his friend Barney Rubble) New problems: chapter 8: 2, 7, 9, 12, 15, 21, 23, 24, 26, 28 Due Wednesday April 13 th .
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Molecular Bonds Metallic bond : Free valence electrons may be shared by a number of atoms. Drude model for a metal: a free- electron gas!
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Rotational States Molecular spectroscopy : We can learn about molecules by studying how molecules absorb, emit, and scatter light. From the equi-partition theorem, a diatomic molecule may be thought of as two atoms held together with a massless, rigid rod ( rigid rotator model ). In a purely rotational system, the kinetic energy is expressed in terms of the angular momentum L and rotational inertia I .
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Rotational States L is quantized. The energy levels are E rot varies only as a function of the quantum number .
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A vibrational energy mode can also be excited. Thermal excitation of a vibrational mode can occur. It is also possible to stimulate vibrations in molecules with light. Assume that the two atoms are
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Manfra25-2011 - CHAPTER 10 Molecules and Solids 10.1...

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