L41-for-posting - The Electromagnetic Spectrum Lecture 41...

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1 Lecture 41 Now You See Now You See: Spectroscopy Key Idea: “Spectroscopy" is a powerful tool for learning about atoms and molecules. The Electromagnetic Spectrum micro- wave Visible radiation: A valence electron changes orbitals Example : H atom emission, transition from n>2 to n=2 H 400 nm 700 nm Example : π→π * transition in indigo dye energy π * E σ * π σ Co(NH 3)6 3+ (aq) Example : d orbital transition in Co 3+ The Electromagnetic Spectrum micro- wave valence electron transition molecular vibrations molecular rotations nuclear spin flip core electron transition nuclear transition Spectroscopy and Applications λ region Transition Application UV/Vis Valence e Stratospheric Ozone : How does it protect us from cataracts and skin cancer ? IR Molecular vibrations Greenhouse Gases : What are they and why do they warm up the atmosphere ? Micro- wave Molecular rotations Microwave ovens : How is food heated without heat ?
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Fall '08 term at University of California, Berkeley.

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L41-for-posting - The Electromagnetic Spectrum Lecture 41...

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