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Excited State Lifetimes and Bimolecular Quenching of Iodine Vapor

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Giles Henderson , Ronald Tennis and Terry Ramsey

Department of Chemistry, Eastern Illinois University, Charleston, IL 61920

J. Chem. Educ., 1998, 75 (9), p 1139

DOI: 10.1021/ed075p1139

Publication Date (Web): September 1, 1998

Section:

History, Education, and Documentation

Abstract

A pulsed dye laser is used to prepare B(³Π_ou⁺) 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 asealed 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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Atomic Properties / Structure

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