lecture39_40 - Molecules 1) Types of molecular bonds Ionic...

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Molecules 1) Types of molecular bonds Ionic bonds Interaction between oppositely charged ionized atoms Examples: NaCl, MgCl 2 Typical energy: 1 – 5 eV Covalent bonds More equal role of two atoms than with ionic bonds Examples: H 2 , CH 4 Typical energy: 1 – 5 eV Van der Vaals Bonds Interaction between the electric dipole moments of atoms or molecules Examples: Typical energy: 0.1eV or less Hydrogen bonds Unique to hydrogen containing compounds Examples: organic molecules Typical energy: less then 0.5eV
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Covalent bonds in a hydrogen molecule Schematic diagram of the methane molecule
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2) Molecular spectra Rotational energy levels I L I E 2 2 2 2 1 = = ϖ 1 ,... 1 , 0 - = n l ( 29 I l l E l 2 1 2 + = Vibrational energy levels ( 29 ( 29 r n m k n n E 2 1 2 1 + = + = 2 o r r m I = 2 1 2 1 m m m m m r + =
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Rotational and vibrational energy levels ( 29 ( 29 r nl m k n I l l E 2 1 2 2 1 + + + =
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lecture39_40 - Molecules 1) Types of molecular bonds Ionic...

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