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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > August  >
Research: Science and Education
Teaching the Rovibronic Spectroscopy of Molecular Iodine
J. Charles Williamson
Department of Chemistry, Willamette University, Salem, OR 97301
Cover
August 2007
Vol. 84 No. 8
p. 1355
Abstract
Molecular iodine absorbance and fluorescence spectroscopy has a long history in the undergraduate physical chemistry laboratory curriculum. A review of articles from the pedagogical literature reveals surprising variability in reported X-state and B-state potential parameters derived from such well-studied spectra. The variation is a result of errors in spectral interpretation and analysis, and this article clarifies the correct methods for treating the data. Parameters obtained from student data are compared with accepted values from the primary literature, and expectations for accuracy and precision are established. This article also points out that the internuclear separation of X-state I2 can be calculated from the spacing of an easily resolved rotational doublet in the argon ion laser-induced fluorescence spectrum. This doublet has not been identified before in pedagogical articles.
Supplement
Expanded theoretical development, further clarification on how to interpret the spectra, and a flowchart for students showing the main analysis steps necessary to calculate model potential energy curves from the collected spectra are available.
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Citation
Williamson, J. Charles. J. Chem. Educ. 2007, 84, 1355.
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Keywords
Fluorescence Spectroscopy; Gases; Hands-On Learning / Manipulatives; Laboratory Instruction; Lasers; Misconceptions / Discrepant Events; Molecular Properties / Structure; Photochemistry; Physical Chemistry; Quantum Chemistry; Spectroscopy; Upper-Division Undergraduate; UV-Vis Spectroscopy
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History
Created:
Last Updated:
6/22/2007
7/6/2007
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