克服单强脉冲产生双激发二聚体的封锁及其衰变
Overcoming blockade in producing doubly-excited dimers by a single intense pulse and their decay
摘要：
通过吸收具有相同能量的两个光子来激发团簇中的两个相同物种被强烈抑制，因为由于结合库仑相互作用，一个亚基的激发阻止了另一个亚基的激发。在这里，我们提出了一个非常有效的方法来克服这种封锁，在生产双激发同质原子团簇由一个单一的强激光脉冲。对于Ne $_2$，它明确表明，脉冲的最佳载波频率是由目标状态的能量的一半，这允许一个双重激发一半以上的二聚体在中等场强。这些二聚体然后经历超快原子间衰变，使一个Ne到其基态并电离另一个。所报道的\emph{ab initio}电子光谱为未来强激光脉冲实验提供了可靠的预测。
英文摘要：
Excitation of two identical species in a cluster by the absorption of two photons of the same energy is strongly suppressed since the excitation of one subunit blocks the excitation of the other one due to the binding Coulomb interaction. Here, we propose a very efficient way to overcome this blockade in producing doubly-excited homoatomic clusters by a single intense laser pulse. For Ne$_2$ it is explicitly demonstrated that the optimal carrier frequency of the pulse is given by half of the energy of the target state, which allows one to doubly excite more than half of the dimers at moderate field intensities. These dimers then undergo ultrafast interatomic decay bringing one Ne to its ground state and ionizing the other one. The reported \emph{ab initio} electron spectra present reliable predictions for future experiments by strong laser pulses.
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