# OBSERVATION AND ANALYSIS OF THE $2^{1}\Sigma^{+}_{g}$ STATE OF ${^{7}}Li_{2}$ and ${^{6}}Li_{2}$

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 Title: OBSERVATION AND ANALYSIS OF THE $2^{1}\Sigma^{+}_{g}$ STATE OF ${^{7}}Li_{2}$ and ${^{6}}Li_{2}$ Creators: Bacis, R.; Barakat, B.; Churassy, S.; Linton, C.; McDonald, S.; Martin, F.; Vergès, J. Issue Date: 1984 Publisher: Ohio State University Abstract: A transition in the $4700 - 7100 cm^{-1}$ region, from the previously unobserved $2^{1}\Sigma^{+}_{g}$ state of $Li_{2}$ to the $A^{1}\Sigma^{+}_{u}$ state has been observed in the Fourier Transform Infrared Spectrum of the Laser Induced Fluorescence excited by several lines of the argon ion laser. High resolution data have been obtained for seventeen vibrational levels of the $2^{1}\Sigma^{+}_{g}$ state of ${^{7}}Li_{2}$ and twelve levels of ${^{6}}Li_{2}$, thus establishing the vibrational numbering. Results of the rotational and vibrational analysis will be presented and discussed in relation to recent theoretical $predictions.^{1}$ Description: $^{1}$ D.D. Konowalow and J.L. Fish, Chem. Phys. 84, 463 (1984). Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Moleculaire, Universit\'{e} Claude Bernard-Lyon I; Physics Department, University of New Brunswick; Department of Chemistry and the George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology; Laboratoire Aim\'{e} Cotton, C.N.R.S. II URI: http://hdl.handle.net/1811/16579 Other Identifiers: 1984-FB-19