'Low fluorescence glass quartz' diaporamas de présentation

Luminescence is rare in nonaromatic hydrocarbons.

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Solvent Effects

nonequilibrium excited state. Solvent Effects. Increased viscosity can increase luminescence intensity. H-bonding and dipole interactions with the solvent contribute to the Stokes shift. Ashutosh Sharma and Stephen Schulman, Fluorescence Spectroscopy , John Wiley & Sons, New York, 1999.

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Quenching

Quenching. Non- radiative energy transfer from excited species to other molecules. Quantum Yield and Quenching. Show that quantum yield in the presence of a quencher is:. F A,p = k A n S0 V. F F,p = k F n S1 V. Dynamic Quenching/ Collisional Quenching

594 views • 12 slides