Time-Resolved Double-Resonance Spectroscopy: vibrationally resolved lifetimes of the Na$_2$ $6^1\Sigma^+_g (v=8)$

When determining the dipole transition moment, lifetimes, Einstein A coefficients and absorption lines are all important for ensuring accuracy. Thus here we present our ongoing experimental study of the lifetime of the $6^1\Sigma^+_g (v=8)$ electronic state of sodium dimers. In this experiment the second harmonic of a Nd:YAG laser is used to pump two pulsed dye lasers that are used to make the $X^1\Sigma^+_g (v=0) \rightarrow A^1\Sigma^+_u (v=7) \rightarrow 6^1\Sigma^+_g (v=8)$ transition. We observed the fluorescence resulting from this molecular transition to measure the radiative properties using a Stern-Volmer plot. We will present preliminary results of the measurement and provide comparison with theoretical calculations.