Production of autoionizing states by double-electron capture in intermediate-energy C4++ He collisions

被引：2

作者：

Guo, D. L. ^{[1
,2
]}

Zhang, R. T. ^{[1
,2
]}

Zhu, X. L. ^{[1
,2
]}

Gao, Y. ^{[1
,2
]}

Zhao, D. M. ^{[1
,2
]}

Lin, K. Z. ^{[1
,3
,4
]}

Zhu, X. B. ^{[1
,2
]}

Zhang, S. F. ^{[1
,2
]}

Ma, X. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[4] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

来源：

PHYSICAL REVIEW A | 2023年 / 107卷 / 01期

基金：

中国国家自然科学基金;

关键词：

DIFFERENTIAL CROSS-SECTIONS; HIGHLY-CHARGED IONS; RECOIL-ION; SINGLE-ELECTRON; MOMENTUM SPECTROSCOPY; NE10++HE COLLISIONS; C-4+ IONS; O-6+; SLOW; EMISSION;

D O I：

10.1103/PhysRevA.107.012801

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have performed a kinematically complete experiment for state-selective double-electron capture occurring in 15-keV/u C4+ + He collisions by means of cold-target recoil-ion momentum spectroscopy. It was shown that capture into ground and low excited states of the C2+ ions is overwhelmingly dominant. Besides, a small fraction of autoionization decays from doubly excited states of symmetric as well as asymmetric electron configurations following endothermic double-electron capture were clearly observed. Emphasis was given to the population mechanisms of the different electron configurations. Our analysis indicates that electron-electron correlation effects may play a major role in the double-electron capture process. In addition, the large transverse recoil ion momentum of symmetric configurations as compared to asymmetric configurations for the doubly excited autoionizing states may be attributed to the different number of steps involved in the primary capture process, with the former likely produced by a two-step mechanism and the latter by a one-step mechanism.

引用

页数：6

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