A discussion and analysis of the X ?? B absorption and emission spectra of gaseous molecular iodine has been an important component of the undergraduate physical chemistry laboratory and lecture curriculum for decades. A detailed analysis of these spectra requires an understanding of a wide variety of important topics in physical chemistry. It is possible to carry out an analysis of the X ? B absorption spectrum using transitions located in an online database. Unfortunately, use of these online data is time-consuming and has limitations for the determination of some spectroscopic constants. By combining the results of published high resolution absorption and emission experiments, a spectral data set of molecular iodine electronic transitions has been generated. This data set allows undergraduate students to partake in an efficient and accurate rovibronic analysis of the X ?? B transition of molecular iodine. This analysis, which is suitable for a laboratory experience or an in-depth homework exercise, allows students to determine spectroscopic constants and Morse potentials for both the X and the B state. The analysis should be of interest to many undergraduate institutions that do not have the equipment necessary to acquire iodine vapor spectra at a resolution sufficient for a complete analysis.

Molecular iodine absorption and emission spectra: A comprehensive �dry lab� analysis

246th National Meeting (2013)

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