Experimental measurement of state selective double electron capture in collision between 1.4–20 keV/u Ar<sup>8+</sup> with He

Wu Yi-Jiao; Meng Tian-Ming; Zhang Xian-Wen; Tan Xu; Ma Pu-Fang; Yin Hao; Ren Bai-Hui; Tu Bing-Sheng; Zhang Rui-Tian; Xiao Jun; Ma Xin-Wen; Zou Ya-Ming; Wei Bao-Ren

doi:10.7498/aps.73.20241290

Abstract

Electron capture in the collision of highly charged ions with atoms and molecules is a fundamental process related to the electron transition between bound states belonging to two atomic-centers. The X-ray emission after electron capture is important for X-ray astrophysical modeling, fusion plasma diagnostics, and ion irradiated biophysics. In the past few decades, momentum-imaging cold-target recoil ion momentum spectroscopy has been a significantly developed technique and widely used to measure the quantum state-selective population in electron capture processes. Based on the cold target recoil ion momentum spectroscopy installed on the 150 kV highly charged ion platform in Fudan University, Shanghai City, China, the state-selectivity of double electron capture in the bombardment of 1.4–20 keV/u Ar⁸⁺ on He is measured, and the relative cross sections of the 3l 3l' to 3l 7l' double excited states are obtained. It is found that with the increase of collision energy, more quantum state-selectivity channels are open in the double electron capture of Ar⁸⁺-He collision. It is also found that the relative cross section of the quantum state population is strongly dependent on the collision energy of the projectile ion. The present measurements not only enrich the state-selective cross-sectional library and collision dynamics of highly charged ion charge exchange processes, but also provide experimental benchmarks for existing theoretical calculations.

Keywords:

highly charged ions /
double electron capture /
quantum state-selective /
cold target recoil ion momentum spectroscopy

Authors and contacts

Corresponding author: Zhang Rui-Tian, zhangrt@impcas.ac.cn ; Wei Bao-Ren, brwei@fudan.edu.cn

Funds: Project supported by the National Key R&D Program of China (Grant No. 2022YFA1602504), the National Natural Science Foundation of China (Grant Nos. 12204110, 12374227, U1832201), the Shanghai Municipal Key Discipline Construction Project Funding, China (Grant No. B107), and the Strategic Leading Science and Technology Project of Chinese Academy of Sciences (Class B) (Grant No. XDB34020302).

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Energy/(keV·u^–1)	${ nl} { n'l}'$
Energy/(keV·u^–1)	3p7l	3s10l	3s6l	3p4p	3s4s	3s3d	3p²	3s3p
1.4	35.4(3.8)	26.4(2.9)	22.8(2.5)	9.1(1.2)	3.9(0.6)
2.2	32.0(3.4)	22.5(2.4)	24.2(2.6)	11.9(1.4)	7.4(0.9)
3.0	24.5(2.6)	21.5(2.3)	26.6(2.9)	15.9(1.7)	9.1(1.0)	0.6(0.4)	0.3(0.0)
4.0	19.3(2.3)	20.6(2.5)	27.0(3.0)	17.0(1.8)	12.1(1.3)	1.1(0.2)	0.4(0.2)
5.2	17.6(1.9)	19.7(2.1)	26.7(2.9)	17.3(1.9)	14.6(1.6)	2.2(0.4)	0.5(0.3)
6.4	17.4(1.9)	18.8(2.0)	24.5(2.6)	16.9(1.8)	16.9(1.8)	3.3(0.7)	0.8(0.6)	0.2(0.2)
8.0	17.1(1.8)	18.6(2.0)	22.0(2.4)	16.0(1.7)	18.8(2.0)	4.7(0.6)	1.3(0.5)	0.4(0.3)
10.0	15.2(1.7)	18.1(2.0)	19.1(2.1)	17.6(1.9)	19.4(2.1)	6.8(1.0)	2.2(0.7)	0.7(0.5)
12.0	14.6(1.6)	17.1(2.0)	16.4(1.8)	19.1(2.1)	20.2(2.1)	7.8(1.0)	2.7(0.6)	1.1(0.3)
14.4	12.0(1.4)	16.0(1.8)	16.7(1.8)	21.8(2.4)	19.3(2.1)	9.1(1.1)	2.2(0.7)	1.8(0.5)
17.0	10.6(1.2)	15.1(1.7)	16.8(1.8)	24.2(2.6)	18.8(2.1)	8.9(1.2)	1.6(0.5)	2.9(0.5)
20.0	11.3(1.3)	16.6(1.9)	15.6(1.9)	28.7(3.5)	15.1(2.0)	8.6(1.4)	1.3(0.9)	2.3(0.5)

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Vol. 73, Issue 24 - 2024-12-20

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