# HIGH RESOLUTION SPECTRUM FOR THE $A ^{1}\Sigma^{+}_{u}-X^{1}\Sigma^{+}_{g}$ SYSTEM OF LITHIUM ISOTOPOMERS

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 Title: HIGH RESOLUTION SPECTRUM FOR THE $A ^{1}\Sigma^{+}_{u}-X^{1}\Sigma^{+}_{g}$ SYSTEM OF LITHIUM ISOTOPOMERS Creators: Wang, X.; Yang, J.; Qi, Jianbing; Lyyra, A. M.; Le Roy, Robert J. Issue Date: 1998 Publisher: Ohio State University Abstract: On combining our over 40 vibrational bands for the $A ^{1}\Sigma^{+}_{n}-X^{1}\Sigma^{+}_{g}$ system of $^{6}Li_{2}$ and $^{6,7}Li_{2}$ sub-Doppler polarization spectrum with literature data from the Fourier transform spectrum of this system for $^{7}Li_{2},^{a}$ we have determined a new set of Le Roy - type molecular $constants,^{b}$ which include mass-reduced Dunham constants and Born-Oppenheimer and JWKB breakdown (BOB) correction terms, describing these two electronic states of all three isotopomers. The preliminary results indicate that the BOB corrections are not significant for the $X^{1}\Sigma^{+}_{g}$ state, but are significant for $A^{1}\Sigma^{+}_{u}$ state. Description: $^{a}$ Linh D. Le and R.A. Bernheim. Atlas of the Absorption Spectrum of $^{6}Li_{2}$ and $^{7}Li_{2}$. $^{b}$ R.I. Le Roy, paper FB09 at the $52^{nd}$ Ohio State University International Symposium on Molecular Spectroscopy''. Columbus, Ohio (1997); manuscript in preparation. Author Institution: Department of Physics, Temple University; Guelph-Waterloo Centre for Graduate Work in Chemistry, University of Waterloo URI: http://hdl.handle.net/1811/18754 Other Identifiers: 1998-FB-11