Observation of fast and slow interatomic Coulombic decay in argon dimers induced by electron-impact ionization
Observation of fast and slow interatomic Coulombic decay in argon dimers induced by electron-impact ionization
复制标题
DOI：
10.1103/physreva.96.032715
复制
发表时间：
2017-09
影响因子：
2.9
通讯作者：
X. Ren;T. Miteva;P. Kolorenč;K. Gokhberg;A. Kuleff;L. Cederbaum;A. Dorn
中科院分区：
文献类型：
--
作者：
X. Ren;T. Miteva;P. Kolorenč;K. Gokhberg;A. Kuleff;L. Cederbaum;A. Dorn
利用多粒子符合实验研究了电子碰撞电离(${E}_{0}=90\phantom{\rule{0.16em}{0ex}}\mathrm{eV}$)引起的Ar原子间库仑衰变，得到了电子和碎片离子的动量矢量和动能。ICD过程的特征是从碎片离子的抛射电子能量与动能释放(Ker)之间的关联图获得的，其中可以识别出低能ICD电子。此外，ICD的初态能量和入射能量损失将ICD过程分为快原子间衰变和慢原子间衰变。研究了发射低能ICD电子的能量与初态能量的关系。分别获得了快衰变过程和慢衰变过程的ICD电子能谱和Ker谱，其中慢衰变通道的Ker谱受核运动的影响很大。用从头算方法很好地再现了Ker和ICd电子能谱。
We investigate the interatomic Coulombic decay (ICD) in argon dimers induced by electron-impact ionization (${E}_{0}=90\phantom{\rule{0.16em}{0ex}}\mathrm{eV}$) using a multiparticle coincidence experiment in which the momentum vectors and, consequently, the kinetic energies for electrons and fragment ions are determined. The signature of the ICD process is obtained from a correlation map between ejected electron energy and kinetic energy release (KER) for ${\mathrm{Ar}}^{+}+{\mathrm{Ar}}^{+}$ fragment ions where low-energy ICD electrons can be identified. Furthermore, two types of ICD processes, termed fast and slow interatomic decay, are separated by the ICD initial-state energies and projectile energy losses. The dependence of the energies of emitted low-energy ICD electrons on the initial-state energy is studied. ICD electron energy spectra and KER spectra are obtained separately for fast and slow decay processes where the KER spectra for the slow decay channel are strongly influenced by nuclear motion. The KER and ICD electron energy spectra are well reproduced by ab initio calculations.