标题： 茚鎓离子的辐射稳定化：闭壳层多环芳烃中的重复荧光 显示英文标题

标题： Radiative stabilization of the indenyl cation: Recurrent fluorescence in a closed-shell polycyclic aromatic hydrocarbon

摘要： 在寒冷、黑暗的金牛座分子云-1环境中，已经识别出几种具有闭壳层电子结构的小多环芳烃（PAHs）。 我们通过闭壳层茚基阳离子（C$_{9}$H$_{7}^{+}$）中反复荧光（RF）和红外发射的结合测量了有效的辐射冷却，发现与包含分子动力学轨迹的主方程模型有良好一致性，该模型用于描述RF的内能依赖性特性。 我们发现C$_{9}$H$_{7}^{+}$在高达$E_{c}=5.85$电子伏特的振动能量下形成，这比解离阈值高出$\approx$2电子伏特，通过辐射冷却而不是解离。 这种高效的辐射稳定动力学可能普遍存在于太空中存在的其他闭壳层PAHs中，从而增加了它们的丰度。 显示英文摘要

摘要： Several small polycyclic aromatic hydrocarbons (PAHs) with closed-shell electronic structure have been identified in the cold, dark environment Taurus Molecular Cloud-1. We measure efficient radiative cooling through the combination of recurrent fluorescence (RF) and IR emission in the closed-shell indenyl cation (C$_{9}$H$_{7}^{+}$), finding good agreement with a master equation model including molecular dynamics trajectories to describe internal-energy dependent properties for RF. We find that C$_{9}$H$_{7}^{+}$ formed with up to $E_{c}=5.85$\,eV vibrational energy, which is $\approx$2\,eV above the dissociation threshold, radiatively cool rather than dissociate. The efficient radiative stabilization dynamics are likely common to other closed-shell PAHs present in space, contributing to their abundance.