Knowledge Bank

The fluorescence spectra of the $B1\Pi u-X1\Sigma g+$ system of $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}LI2$ excited by the visible CW lines of the argon ion laser have been reported by velasco. Ottinger and $Zare1$. Recently Lightman and $Mature2$ have reported calculations of the possible B-X transitions of the $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}LI2$ molecule that are near coincident with eight different visible argon ton laser frequencies. We have carried out the laser induced fluorescence of $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}LI2$ for all these lines and identified a number of new series. We have also calculated the relative intensity of all the observed lines. One important reason for studying the laser induced fluorescence of $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}LI2$ Is to find transitions that might lase when optically pumped. This molecule (like $\mathrm{<mrow\; data-mjx-texclass="ORD">7</mrow>}Li2$) is a promising candidate for efficient, scalable and line tunable lasers in the visible and near infrared. Another reason for studying laser induced fluorescence of $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}LI2$ is to obtain sufficient information about this molecule before studying fluorescence spectra of $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}Li7Li$ to search for direct excitation of nominally gerade states. We are also in the process of carrying out the laser induced fluorescence using UV lines of the argon ion $laser.\ast$ Supported by the National Science Foundation and the National Aeronautics and Space Administration. $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ R. Velasco, Ch. Ottinger and R. N. Zare, J. Chen. Phys. 51, 5522 (1969).$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ A. J. Lightman and B. P. Mathur, J Chem, Phys. 69. 2262 (1978).