We report on radiative lifetime and collisional cross section measurements of the Na${}_2$ 6${}^1{\Sigma }_g^{+}(v$=6, $J$=31) and 6${}^1{\Sigma }_g^{+}(v$=8, $J$=31) molecular levels by time-resolved laser spectroscopy. The excitation to the 6${}^1{\Sigma }_g^{+}$(3s+5s) electronic state was achieved using two synchronized pulsed lasers, directed to the sodium heatpipe oven and molecular fluorescence decay time as a function of buffer gas was recorded via time-correlated single photon counting technique. Radiative lifetimes were measured using a Stern-Volmer plots. From the lifetime measurements, collisional cross sections between the sodium molecules in the 6${}^1{\Sigma }_g^{+}$ state and the ground state argon atoms were extracted.

我们报告了Na的辐射寿命和碰撞截面测量${}_2$ 6${}^{\mathrm{1个}}{\Sigma }_G^{+}（v$= 6， $Ĵ$= 31）和6${}^{\mathrm{1个}}{\Sigma }_G^{+}（v$= 8， $Ĵ$= 31）通过时间分辨激光光谱分析的分子水平。激发到6${}^{\mathrm{1个}}{\Sigma }_G^{+}$使用两个同步的脉冲激光（指向钠热管炉）获得（3s + 5s）电子状态，并通过与时间相关的单光子计数技术记录了分子荧光衰减时间与缓冲气体的关系。使用斯特恩-沃尔默图测量辐射寿命。根据寿命测量，6个钠分子之间的碰撞截面${}^{\mathrm{1个}}{\Sigma }_G^{+}$ 态和基态氩原子被提取。