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Teaching the Rovibronic Spectroscopy of Molecular Iodine

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J. Charles Williamson

Department of Chemistry, Willamette University, Salem, OR 97301

J. Chem. Educ., 2007, 84 (8), p 1355

DOI: 10.1021/ed084p1355

Publication Date (Web): August 1, 2007

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Fluorescence Spectroscopy

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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).

Molecular Iodine Fluorescence Using a Green Helium−Neon Laser
J. Charles Williamson
Journal of Chemical Education2011 88 (6), 816-818
- Molecular Iodine Fluorescence Using a Green Helium−Neon Laser
  J. Charles Williamson
  Journal of Chemical Education2011 88 (6), 816-818
  Excitation of molecular iodine vapor with a green (543.4 nm) helium−neon laser produces a fluorescence spectrum that is well suited for the upper-level undergraduate physical chemistry laboratory. Application of standard evaluation techniques to the ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
A Simple and Convenient Method of Multiple Linear Regression To Calculate Iodine Molecular Constants
Paul D. Cooper
Journal of Chemical Education2010 87 (7), 687-690
- A Simple and Convenient Method of Multiple Linear Regression To Calculate Iodine Molecular Constants
  Paul D. Cooper
  Journal of Chemical Education2010 87 (7), 687-690
  A new procedure using a student-friendly least-squares multiple linear-regression technique utilizing a function within Microsoft Excel is described that enables students to calculate molecular constants from the vibronic spectrum of iodine. This method ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links