时间分辨双共振光谱：钠分子$6\,^1Σ_g^+(7,31)$电子态的寿命测量
Time-resolved double-resonance spectroscopy: Lifetime measurement of the $6\,^1Σ_g^+(7,31)$ electronic state of molecular sodium
摘要：
我们报告的寿命测量的$6\,^1Σ_g^+ (7,31)$状态的钠$_2$分子，在热管炉中产生的，使用时间分辨光谱技术。通过中间态$A\,^1Σ_u^+ (8,30)$的两步双色双共振激发填充$6\,^1Σ_g^+ (7,31)$能级。激发方案是使用两个同步脉冲染料激光器泵浦的Nd：YAG激光器在第二谐波操作。使用时间相关光子计数技术测量衰变到最终状态时发射的荧光，作为氩气压力的函数。从这个辐射寿命是通过外推到无碰撞零压力的曲线来提取的。我们还报告了计算的辐射寿命的Na $_2$ $6\,^1Σ_g^+$振转能级的范围内的$v=0-200$与PDMATHAMR和$J=31$使用的水平程序的束缚束缚和BCONT程序的束缚-自由转换。我们的计算揭示了束缚-自由跃迁对寿命计算的重要性，以及$v=40$和$v=100$的$J=1$和$J=31$之间约三个因子的大差异，这是由于波函数在具有占主导地位的内部和外部阱振幅之间交替。
英文摘要：
We report on the lifetime measurement of the $6\,^1Σ_g^+ (7,31)$ state of Na$_2$ molecules, produced in a heat-pipe oven, using a time-resolved spectroscopic technique. The $6\,^1Σ_g^+ (7,31)$ level was populated by two-step two-color double resonance excitation via the intermediate $A\,^1Σ_u^+ (8,30)$ state. The excitation scheme was done using two synchronized pulsed dye lasers pumped by a Nd:YAG laser operating at the second harmonics. The fluorescence emitted upon decay to the final state was measured using a time-correlated photon counting technique, as a function of argon pressure. From this the radiative lifetime was extracted by extrapolating the plot to collision-free zero pressure. We also report calculated radiative lifetimes of the Na$_2$ $6\,^1Σ_g^+$ ro-vibrational levels in the range of $v=0-200$ with $J=1$ and $J=31$ using the LEVEL program for bound-bound and the BCONT program for bound-free transitions. Our calculations reveal the importance of the bound-free transitions on the lifetime calculations and a large difference of about a factor of three between the $J=1$ and $J=31$ for the $v=40$ and $v=100$, due to the wavefunction alternating between having predominantly inner and outer well amplitude.
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