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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > September  >
In the Laboratory
Excited State Lifetimes and Bimolecular Quenching of Iodine Vapor
Giles Henderson, Ronald Tennis, and Terry Ramsey
Department of Chemistry, Eastern Illinois University, Charleston, IL 61920
Cover
September 1998
Vol. 75 No. 9
p. 1139
Abstract
A pulsed dye laser is used to prepare B(3Pou+) excited state I2 molecules. Time-resolved fluorescence emission profiles are observed with a monochromator, photomultiplier, and a computer interfaced oscilloscope. The measurements are carried out in a sealed fluorescence cell in which the iodine vapor pressure is precisely regulated by a custom Peltier thermoelectric module, powered by a computer-controlled gated power supply. This arrangement eliminates both the need for a vacuum line and the difficulties students often experience with fluorescence quenching by oxygen or other sample impurities. The fluorescence self-quenching rate constant and the quenching cross section are determined from a Stern-Volmer analysis of the pressure dependence of excited state lifetimes.
Supplement
The detailed version of the laboratory experiment is available from the authors. The text of the laboratory is a Microsoft Word Perfect file. The figures are available as an Adobe Illustrator file or as BMPs.
*  Contents
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*  Citation
 Henderson, Giles; Tennis, Ronald; Ramsey, Terry. J. Chem. Educ. 1998 75 1139.
*  Keywords
 physical chem, excited etates, energy transfer, fluorescence spectrometry, kinetics, laboratory equipment, apparatus, lasers, laser spectroscopy, luminescence
*  History
 Created:
Last Updated:		 June 21, 1999
November 22, 2005
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