带电长程里德堡分子的预解离动力学
Predissociation dynamics of charged long-range Rydberg molecules
AI总结：
该研究针对同核与异核长程里德堡原子-离子分子，采用本征道R矩阵方法计算预解离速率，发现施蒂克尔贝格干涉主导衰变，轻分子解离时间尺度可用于原位研究非绝热衰变。
AI中文摘要：
我们研究同核（$^{87}$Rb$^*$$^{87}$Rb$^+$）和异核（$^{87}$Rb$^*$$^{7}$Li$^+$）长程里德堡原子-离子分子的预解离。由于它们的键长达到微米量级，其解离时间尺度与结合更紧密的双原子分子截然不同。我们采用本征道R矩阵方法，计算了大范围主量子数$n$对应的预解离速率。这些速率强烈依赖于质量，更显著的是，它们随$n$以及同一振动能级阶梯呈现快速周期性变化。半经典朗道-齐纳-施蒂克尔贝格分析表明，施蒂克尔贝格干涉主导了衰变过程，导致观测到的分子寿命变化。尽管同核Rb分子的大质量将其预解离速率限制在亚千赫兹水平，但较轻的$^{87}$Rb$^*$$^{7}$Li$^+$分子的解离时间尺度可与辐射和碰撞衰变相媲美，这使得通过离子显微镜原位研究非绝热衰变成为可能。
英文摘要：
We investigate predissociation in homonuclear ($^{87}$Rb$^*$$^{87}$Rb$^+$) and heteronuclear ($^{87}$Rb$^*$$^{7}$Li$^+$) long-range Rydberg atom-ion molecules. Owing to their micron-scale bond lengths, these dissociate on time scales far removed from those of more tightly bound diatomic molecules. We employ the eigenchannel $R$-matrix method to compute predissociation rates for a broad range of principal quantum numbers $n$. The rates depend strongly on the mass, but more remarkably display a rapid and periodic variation as a function of $n$ as well as within a single vibrational ladder. A semiclassical Landau-Zener-Stückelberg analysis reveals that Stückelberg interference governs the decay process and produces the observed variation in the molecular lifetime. Although the heavy mass of the homonuclear Rb molecule constrains its predissociation rates to a sub-kHz level, the lighter molecule $^{87}$Rb$^*$$^{7}$Li$^+$ dissociates on time scales competitive with radiative and collisional decay. This can enable in situ study of non-adiabatic decay via ion microscopy.
