Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters
Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters
复制标题
多重激发氖团簇的缓慢原子间库仑衰变
DOI：
10.1103/physrevlett.117.276806
复制
发表时间：
2016
影响因子：
8.6
通讯作者：
F. Calegari
中科院分区：
文献类型：
--
作者：
D. Iablonskyi;K. Nagaya;H. Fukuzawa;K. Motomura;Y. Kumagai;S. Mondal;T. Tachibana; T. Takanashi;T. Nishiyama;K. Matsunami;P. Johnsson;P. Piseri;G. Sansone;A. Dubrouil; M. Reduzzi;P. Carpeggiani;C. Vozzi;M. Devetta;M. Negro;F. Calegari
在FERMI装置上，用强自由电子激光（FEL）激发Ne团簇（）。这种多重激发的团簇可以通过至少两个相邻的激发原子之间的能量交换而非辐射地衰变。利用种子自由电子激光辐射的可调谐性和窄带宽特性，对Ne团簇进行了定位。我们发现，通过原子间或分子间库仑衰变（ICD）过程的序列，而ICD的散装原子的簇表面原子的弛豫收益另外受周围的激发介质通过非弹性电子散射。对于这两种情况下，集群激发放松到原子状态之前ICD，表明这种ICD是相当慢（皮秒范围）。通过自由电子激光强度控制每个簇的平均激发数允许对ICD速率进行粗调。
Ne clusters () were resonantly excited () by intense free electron laser (FEL) radiation at FERMI. Such multiply excited clusters can decay nonradiatively via energy exchange between at least two neighboring excited atoms. Benefiting from the precise tunability and narrow bandwidth of seeded FEL radiation, specific sites of the Ne clusters were probed. We found that the relaxation of cluster surface atoms proceeds via a sequence of interatomic or intermolecular Coulombic decay (ICD) processes while ICD of bulk atoms is additionally affected by the surrounding excited medium via inelastic electron scattering. For both cases, cluster excitations relax to atomic states prior to ICD, showing that this kind of ICD is rather slow (picosecond range). Controlling the average number of excitations per cluster via the FEL intensity allows a coarse tuning of the ICD rate.