双光子双激发Ne $_{2}$引起的原子间库仑衰变的时间分辨观测
Time-resolved observation of interatomic Coulombic decay induced by two-photon double excitation of Ne$_{2}$
摘要：
利用种子、全相干、强极紫外自由电子激光FERMI实验鉴定了迄今为止尚未发现的双光子双激发态[Ne $^{*}$（$2p^{-1}3s$）] $_{2}$。这些状态经历超快的原子间库仑衰变（ICD），主要产生单电离二聚体。为了获得ICD的速率，记录Ne $_{2}^{+}$离子的最终产率作为XUV泵浦和UV探测激光脉冲之间的延迟的函数。长寿命双激发态的提取寿命为390（-130 / +450）fs，短寿命双激发态的提取寿命小于150 fs，与\emph{ab initio}量子力学计算结果符合较好.
英文摘要：
The hitherto unexplored two-photon doubly-excited states [Ne$^{*}$($2p^{-1}3s$)]$_{2}$ were experimentally identified using the seeded, fully coherent, intense extreme ultraviolet free-electron laser FERMI. These states undergo ultrafast interatomic Coulombic decay (ICD) which predominantly produces singly-ionized dimers. In order to obtain the rate of ICD, the resulting yield of Ne$_{2}^{+}$ ions was recorded as a function of delay between the XUV pump and UV probe laser pulses. The extracted lifetimes of the long-lived doubly-excited states, 390 (-130 / +450} fs, and of the short-lived ones, less than 150~fs, are in good agreement with \emph{ab initio} quantum mechanical calculations.
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