State-selective Charge Exchange in 19.5-100 keV amu-1 O6+ Collision with He and H2

被引：10

作者：

Cao, T. ^{[1
,2
]}

Meng, T. ^{[3
]}

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

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

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

Yan, S. ^{[1
,2
]}

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

Wang, J. ^{[3
]}

Ma, P. ^{[3
]}

Ren, B. ^{[3
]}

Xia, Z. H. ^{[3
]}

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

Zhang, C. J. ^{[1
,2
]}

Lin, K. Z. ^{[4
,5
]}

Xu, S. ^{[1
,2
]}

Wei, B. ^{[3
]}

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] Fudan Univ, Inst Modern Phys, Key Lab Nucl Phys & Ion Beam Applicat MOE, Shanghai 200433, Peoples R China

[4] Univ Sci & Technol China, Hefei Natl Lab Phys Sci, Hefei 230026, Peoples R China

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

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2023年 / 266卷 / 02期

基金：

中国国家自然科学基金;

关键词：

DOUBLE-ELECTRON-CAPTURE; X-RAY-EMISSION; ATOMIC-ORBITAL-EXPANSION; LOW-ENERGY COLLISIONS; SOLAR-WIND; CROSS-SECTIONS; MOMENTUM SPECTROSCOPY; COMET HYAKUTAKE; SINGLE-ELECTRON; MISSING BARYONS;

D O I：

10.3847/1538-4365/accba2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The cross sections of state-selective charge exchange (CX) between highly charged ions and neutrals are important for modeling extreme ultraviolet and soft X-ray emissions in many astrophysical objects with hot plasma impacting cold media. By using cold-target recoil-ion momentum spectroscopy, we measure O6+ CX collisions with He and H-2 in the collision energy range of 19.5 to 100 keV amu(-1). The relative cross sections of state-selective single CX are reported for electron capture into O5+(1s(2)nl) n = 2, 3, 4, 5, >= 6 and n = 3, 4, 5, >= 6 for He and H-2, respectively. With the collision energy increasing to 100 keV amu(-1), the main capture channel shifts to higher n for both target species as compared to available theoretical results. We also report state-selective cross sections for double CX with He, where doubly excited states of O4+(1s(2)nln'l') with nln'l' being 2s(2) (S-1), 2s(2)p (P-1), 2p(2) (D-1), and 2p(2) (S-1) [symmetric configurations] and 2s3l, 2p3l-2s4l, and 2s5l-2p5l [asymmetric configurations] are distinguished. It is found that the contributions of doubly excited states with asymmetric configurations are dominant and symmetric configurations increasingly come into play with the increase of collision energy. The present results provide experimental benchmarks available for theoretical calculations.

引用

页数：9