Lumo Spec - CH 15: Luminescence Spectroscopy 15-1, 15-2,...

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CH 15: Luminescence Spectroscopy 15-1, 15-2, 15-3, 15-4, 15-5, 15-9
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CH 15: Luminescence Spectroscopy 15-1, 15-2, 15-3, 15-4, 15-5, 15-9 Photoluminescence (or just luminescence) Fluorescence Phosphorescence Chemiluminescence
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Recall Absorption and Emission from Atoms Resonance fluorescence: When the emitted radiation is the same energy as the absorbed radiation.
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Recall Absorption and Emission from Molecules The shift of the emitted radiation to lower energies in molecules is called a Stokes shift .
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Concept Te$t The stokes shift between the absorbance and fluorescence spectra is an example of a:
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Absorption, Fluorescence, and Phosphorescence
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Concept Te$t What is the best way to make a glow-in-the-dark shoe?
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Internal Conversion: Electron passes to a lower energy electronic state of the same multiplicity without emitting a photon. Most efficient when the two states are close in energy and have vibrational levels that overlap. (See Figure 15.2.) Internal conversion leads to large Stokes shifts because an absorption from S 0 to S 2 may only lead to emission from S 1 to S 0 .
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triplet state. Most
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This note was uploaded on 02/23/2011 for the course CHEM 4181 at Colorado.

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Lumo Spec - CH 15: Luminescence Spectroscopy 15-1, 15-2,...

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