论文标题
时间分辨超快的原子间库仑衰变在掺杂钠掺杂的氦纳米光中
Time-resolved Ultrafast Interatomic Coulombic Decay in Superexcited Sodium-doped Helium Nanodroplets
论文作者
论文摘要
极端硫酸盐（XUV）时间分辨的电子光谱研究，研究了掺杂Na原子的纳米光的纳米光谱的自动离子动力学。在激发较高的液滴吸收频段后，将液滴放松到最低的亚稳态原子$ 1S2S $ $ $^{1，\，3} $ s状态下，来自原子间库仑衰减（ICD）的状态是在两个激动的人之间或在兴奋的他之间，或者在兴奋的他之间，或者是在兴奋的他和na atom atom atom and a atom atom atom ant artom artom atom atom atom septed dropplet表面。确定了四个主要的ICD通道，并通过改变XUV脉冲和紫外线脉冲之间的延迟来确定其时间常数，从而使初始激发态离子并从而消除ICD。不同通道的时间常数均在$ \ sim $ 1〜ps的范围内，表明ICD动力学主要由液滴环境确定。瞬态ICD信号的周期性调节暂时归因于局部HE激发周围形成的气泡的振荡。 ICD效率取决于液滴中激发态的总数，而不是指向ICD集体增强的激发态的密度。
The autoionization dynamics of superexcited superfluid He nanodroplets doped with Na atoms is studied by extreme-ultraviolet (XUV) time-resolved electron spectroscopy. Following excitation into the higher-lying droplet absorption band, the droplet relaxes into the lowest metastable atomic $1s2s$ $^{1,\,3}$S states from which Interatomic Coulombic Decay (ICD) takes places either between two excited He atoms or between an excited He atom and a Na atom attached to the droplet surface. Four main ICD channels are identified and their time constants are determined by varying the delay between the XUV pulse and a UV pulse that ionizes the initial excited state and thereby quenches ICD. The time constants for the different channels all fall in the range $\sim$1~ps indicating that the ICD dynamics are mainly determined by the droplet environment. A periodic modulation of the transient ICD signals is tentatively attributed to the oscillation of the bubble forming around the localized He excitation. The ICD efficiency depends on the total number of excited states in a droplet rather than the density of excited states pointing to a collective enhancement of ICD.
