Polarization spectroscopy of the sodium dimer utilizing a triple-resonance technique in the presence of argon

The collisional dynamics of molecular sodium in the $6^1\Sigma_g$ electronic state is under investigation using a triple resonance technique in the presence of argon. A continuous wave ring dye laser is used to populate specific rovibrational levels of the $A^1\Sigma_u$ electronic state. A pump-probe technique is then employed where the pump laser populates the $6^1\Sigma_g$ state, and the probe laser dumps the population to the $B^1\Sigma_u$ state. From this level, fluorescence is detected as the system decays to the $X^1\Sigma_g$ state. We measure the polarization of this signal in the presence of various argon pressures. We will present our current work as well as the processes involved in the experiment.