DOPPLER-FREE HIGH RESOLUTION SPECTRAL ATLAS OF IODINE MOLECULE 15,000 TO $19,000 CM^{-1}$
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Date
2000
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
A new accurate spectral atlas with the Doppler-free spectrum of $I_{2}$ from 15,000 to $19,000 cm^{-1}$ has been made up. Hyperfine lines were resolved using Doppler-free saturation spectroscopy with a single-mode ring dye laser (Coherent 899-29). The spectrum has been recorded together with frequency marks of an etalon. The cavity length of the etalon was stabilized by YAG laser light of which the frequency was locked to a certain hyperfine line of $I_{2}$. These frequency marks were calibrated with the precise transition wavenumbers of several standard lines. The absolute transition wavenumber of each observed hyperfine line can be determined by comparing the spectrum and frequency marks in the atlas. The error is less than $0.00015 cm^{-1}$, which is exceedingly better than the current atlas with the Doppler-limited $spectrum.^{a}$ The new atlas is essential for modern ultrahigh resolution molecular spectroscopy. The accurate transition wavenumbers of the spectral lines are important not only to obtain the accurate molecular constants but also to analyze the energy shifts by perturbation which induces excited state dynamics such as predissociation, intersystem crossing, intramolecular vibrational redistribution, and so on. This new atlas is now in press and will be released soon with the CD-ROM $data.^{b}$
Description
$^{a}$S. Gerstenkorn and P. Luc, Atlas du Spectre d' Absorption de la Mol\'{e}cule d'Iode entre $14800-20000 cm^{-1}$, CNRS, Paris, 1978. $^{b}$This work was promoted by the propulsive committee of Photoscience: Research for the Future of Japan Society for the Promotion of Science (JSPS).
Author Institution: Department of Chemistry, Faculty of Science, Kobe University; Faculty of Integrated Human Studies, Kyoto University
Author Institution: Department of Chemistry, Faculty of Science, Kobe University; Faculty of Integrated Human Studies, Kyoto University