Knowledge Bank

$Na2$ Rydberg states have been observed for $10\le n\le 119$ and $0\le J\le 9$ using high resolution all-optical triple resonance spectroscopy and an ultrasensitive ionizatlon $detector1$. Three cw single mode tunable ring dye/Ti:sapphire lasers (linewidth MHz) were used to reach the singlet ungerade Rydberg states of $Na2$. \begin{equation} nl ^{1}\Lambda ^{(+)}{u} (O, J) \stackrel{L{3}}{\longleftarrow} 3^{1} \Sigma^{+}{g}(0, J^{\prime}) \stackrel{L{2}}{\longleftarrow} A^{1} \Sigma^{+}{u} (I, J^{\prime\prime}) \stackrel{L{1}}{\longleftarrow} X^{1} \Sigma^{+}_{g} (I, J^{\prime\prime}). \end{equation} The ionization potential (IP) of $Na2$ was estimated by extrapolation to be $39478.75\pm 0.04cm-1$. This implies that the dissociation energy of the molecular ion $De(Na2+X2\Sigma g)$ is $7973.83\pm 0.12cm-1$. Four series, $np1\Sigma u+,np1\Pi u,nf1\Sigma u+$ and $nf1\Pi u$, were found and rovibrational interactions, l-uncoupling, stroboscopic effects and Fano autoionization profiles were observed in the spectra.