elecspec

elecspec - Electronic Spectroscopy Using light absorption...

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Electronic Spectroscopy Using light absorption to change charge distribution of electrons about molecule This is a lot of energy often can break bonds. Types of electronic transitions: Organics: Involving π , σ , n electrons Saturated compounds σ→σ (<150 nm), n →σ (<250 nm): deep UV Double bonds/unsaturated systems less energy to π π→π , n →π transitions : UV and visible (200-700 nm) C C + C C + + C O + C O + + Inorganics: Additionally, transitions between d orbitals split by presence of ligand field. Usually in visible. d-d transition Charge transfer transition: Electron moves between ligand and metal. One must act as donor and other as acceptor MnO 4 Electronic Spectra (We will work with examples from diatomics) At equilibrium, molecule is in ground electronic state lowest energy electronic state and typically in v=0. Transitions to higher lying electronic states are accompanied by changes in v, J.
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This note was uploaded on 11/27/2011 for the course CHEM 5.43 taught by Professor Timothyf.jamison during the Spring '07 term at MIT.

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elecspec - Electronic Spectroscopy Using light absorption...

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