Knowledge Bank

Optical-optical double resonance, using two tunable dye lasers pumped by a nitrogen laser, has been used to characterize several hitherto unobserved gerade excited electronic states in $\mathrm{<mrow\; data-mjx-texclass="ORD">7</mrow>}Li2$. One laser fixed in wavelength, excited molecules from the $X1\Sigma g+$ ground state to a single level in the $A1\Sigma u+$ state. The second laser excited Molecules in the A state to the gerade states, which include at least one $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Sigma g+$ state and at least one $\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}\Pi g$ state. Molecular constants obtained for these states will be given.