Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm

doi:10.1088/1674-1056/ab69eb

中国物理B ›› 2020, Vol. 29 ›› Issue (3): 33401-033401.doi: 10.1088/1674-1056/ab69eb

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm

Nadir Khan, Zhong-Kui Huang(黄忠魁), Wei-Qiang Wen(汶伟强), Shu-Xing Wang(汪书兴), Han-Bing Wang(汪寒冰), Wan-Lu Ma(马万路), Xiao-Long Zhu(朱小龙), Dong-Mei Zhao(赵冬梅), Li-Jun Mao(冒立军), Jie Li(李杰), Xiao-Ming Ma(马晓明), Mei-Tang Tang(汤梅堂), Da-Yu Yin(殷达钰), Wei-Qing Yang(杨维青), Jian-Cheng Yang(杨建成), You-Jin Yuan(原有进), Lin-Fan Zhu(朱林繁), Xin-Wen Ma(马新文)

1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Hefei National Laboratory for Physical Sciences at Micro-scale, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

收稿日期:2019-11-28 修回日期:2020-01-06 出版日期:2020-03-05 发布日期:2020-03-05
通讯作者: Wei-Qiang Wen, Xin-Wen Ma E-mail:wenweiqiang@impcas.ac.cn;x.ma@impcas.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300) and the National Natural Science Foundation of China (Grant Nos. U1932207, 11904371, and U1732133).

Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm

Nadir Khan^1,2, Zhong-Kui Huang(黄忠魁)¹, Wei-Qiang Wen(汶伟强)^1,2, Shu-Xing Wang(汪书兴)³, Han-Bing Wang(汪寒冰)¹, Wan-Lu Ma(马万路)³, Xiao-Long Zhu(朱小龙)^1,2, Dong-Mei Zhao(赵冬梅)¹, Li-Jun Mao(冒立军)^1,2, Jie Li(李杰)¹, Xiao-Ming Ma(马晓明)¹, Mei-Tang Tang(汤梅堂)¹, Da-Yu Yin(殷达钰)¹, Wei-Qing Yang(杨维青)¹, Jian-Cheng Yang(杨建成)^1,2, You-Jin Yuan(原有进)^1,2, Lin-Fan Zhu(朱林繁)³, Xin-Wen Ma(马新文)^1,2

1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Hefei National Laboratory for Physical Sciences at Micro-scale, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

Received:2019-11-28 Revised:2020-01-06 Online:2020-03-05 Published:2020-03-05
Contact: Wei-Qiang Wen, Xin-Wen Ma E-mail:wenweiqiang@impcas.ac.cn;x.ma@impcas.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300) and the National Natural Science Foundation of China (Grant Nos. U1932207, 11904371, and U1732133).

摘要/Abstract

摘要： Recombination of Ar¹⁴⁺, Ar¹⁵⁺, Ca¹⁶⁺, and Ni¹⁹⁺ ions with electrons has been investigated at low energy range based on the merged-beam method at the main cooler storage ring CSRm in the Institute of Modern Physics, Lanzhou, China. For each ion, the absolute recombination rate coefficients have been measured with electron-ion collision energies from 0 meV to 1000 meV which include the radiative recombination (RR) and also dielectronic recombination (DR) processes. In order to interpret the measured results, RR cross sections were obtained from a modified version of the semi-classical Bethe and Salpeter formula for hydrogenic ions. DR cross sections were calculated by a relativistic configuration interaction method using the flexible atomic code (FAC) and AUTOSTRUCTURE code in this energy range. The calculated RR + DR rate coefficients show a good agreement with the measured value at the collision energy above 100 meV. However, large discrepancies have been found at low energy range especially below 10 meV, and the experimental results show a strong enhancement relative to the theoretical RR rate coefficients. For the electron-ion collision energy below 1 meV, it was found that the experimentally observed recombination rates are higher than the theoretically predicted and fitted rates by a factor of 1.5 to 3.9. The strong dependence of RR rate coefficient enhancement on the charge state of the ions has been found with the scaling rule of q^3.0, reproducing the low-energy recombination enhancement effects found in other previous experiments.

关键词: storage ring, electron cooler, highly charged ions, radiative recombination enhancement

Abstract: Recombination of Ar¹⁴⁺, Ar¹⁵⁺, Ca¹⁶⁺, and Ni¹⁹⁺ ions with electrons has been investigated at low energy range based on the merged-beam method at the main cooler storage ring CSRm in the Institute of Modern Physics, Lanzhou, China. For each ion, the absolute recombination rate coefficients have been measured with electron-ion collision energies from 0 meV to 1000 meV which include the radiative recombination (RR) and also dielectronic recombination (DR) processes. In order to interpret the measured results, RR cross sections were obtained from a modified version of the semi-classical Bethe and Salpeter formula for hydrogenic ions. DR cross sections were calculated by a relativistic configuration interaction method using the flexible atomic code (FAC) and AUTOSTRUCTURE code in this energy range. The calculated RR + DR rate coefficients show a good agreement with the measured value at the collision energy above 100 meV. However, large discrepancies have been found at low energy range especially below 10 meV, and the experimental results show a strong enhancement relative to the theoretical RR rate coefficients. For the electron-ion collision energy below 1 meV, it was found that the experimentally observed recombination rates are higher than the theoretically predicted and fitted rates by a factor of 1.5 to 3.9. The strong dependence of RR rate coefficient enhancement on the charge state of the ions has been found with the scaling rule of q^3.0, reproducing the low-energy recombination enhancement effects found in other previous experiments.

Key words: storage ring, electron cooler, highly charged ions, radiative recombination enhancement

中图分类号: (Recombination, attachment, and positronium formation)

34.80.Lx

29.20.db (Storage rings and colliders) 32.30.-r (Atomic spectra?)

Nadir Khan, 黄忠魁, 汶伟强, 汪书兴, 汪寒冰, 马万路, 朱小龙, 赵冬梅, 冒立军, 李杰, 马晓明, 汤梅堂, 殷达钰, 杨维青, 杨建成, 原有进, 朱林繁, 马新文. Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm[J]. 中国物理B, 2020, 29(3): 33401-033401.

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Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm

Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm

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