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Photoacoustic Calorimetry: An Undergraduate Physical-Organic Experiment

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Beth Fletcher and Joseph J. Grabowski

Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260

J. Chem. Educ., 2000, 77 (5), p 640

DOI: 10.1021/ed077p640

Publication Date (Web): May 1, 2000

Section:

History, Education, and Documentation

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. Two 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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Feature):

Topics in Chemical Instrumentation

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Lasers

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Citing Articles

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Listening to Nanomaterials: Photoacoustic Spectroscopy
Narayanan Kuthirummal
Journal of Chemical Education2009 86 (10), 1238
- Listening to Nanomaterials: Photoacoustic Spectroscopy
  Narayanan Kuthirummal
  Journal of Chemical Education2009 86 (10), 1238
  An efficient and low-cost spectroscopic tool, photoacoustic spectroscopy (PAS), is described. Although this tool is suitable for all levels of chemistry and physics laboratories, it is particularly useful in an undergraduate laboratory. PAS is an ...
  Abstract | Hi-Res PDF | PDF w/ Links
Laser Measurement of the Speed of Sound in Gases: A Novel Approach to Determining Heat Capacity Ratios and Gas Composition
J. Clayton Baum , R. N. Compton and Charles S. Feigerle
Journal of Chemical Education2008 85 (11), 1565
- Laser Measurement of the Speed of Sound in Gases: A Novel Approach to Determining Heat Capacity Ratios and Gas Composition
  J. Clayton Baum , R. N. Compton and Charles S. Feigerle
  Journal of Chemical Education2008 85 (11), 1565
  The speed of sound is measured in several gases using a pulsed laser to create a micro-spark on a carbon rod and a microphone connected to a digital oscilloscope to measure the time-of-flight of the resulting shockwave over a known distance. These data ...
  Abstract | Hi-Res PDF | PDF w/ Links