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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > May  >
In the Laboratory
Topics in Chemical Instrumentation
Photoacoustic Calorimetry: An Undergraduate Physical-Organic Experiment
Beth Fletcher and Joseph J. Grabowski
Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260
Cover
May 2000
Vol. 77 No. 5
p. 640
Abstract
Photoacoustic calorimetry (PAC) is a powerful tool for studying photophysical properties of molecules and energetics of discrete chemical reactions. PAC can be thought of simply as "listening to molecules" as they decay from an energetically excited state. The laser technology employed is similar to that already used in many physical chemistry laboratories and is therefore easily implemented as a complementary exercise to existing laser experiments. Moreover, a typical PAC experiment can be accomplished in four hours. Two projects are detailed herein: (i) the measurement of and for the photofragmentation reaction of diphenylcyclopropenone and (ii) determination of the triplet state energy of C60. These projects illustrate PAC as applied to two different chemical systems while utilizing identical theory, equipment, and procedure. Numerous other chemical systems are also addressable by this state-of-the-art technology.
More Information
*  Citation
 Fletcher, Beth; Grabowski, Joseph J. J. Chem. Educ. 2000 77 640.
*  Keywords
 Physical Chemistry; Organic Chemistry; Lasers / Laser Spectroscopy; Laboratory Instruction
*  History
 Created:
Last Updated:		 March 31, 2000
April 15, 2005
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