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

doi:10.1088/1674-1056/ab69eb

	Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm*
	Khan, Nadir 2,3; Huang, Zhong-Kui 3; Wen, Wei-Qiang 2,3; Wang, Shu-Xing 1; Wang, Han-Bing 3; Ma, Wan-Lu 1; Zhu, Xiao-Long 2,3; Zhao, Dong-Mei 3; Mao, Li-Jun 2,3; Li, Jie 3
刊名	CHINESE PHYSICS B
	2020-02-01
卷号	29 期号:3 页码:7
关键词	storage ring electron cooler highly charged ions radiative recombination enhancement
ISSN号	1674-1056
DOI	10.1088/1674-1056/ab69eb
通讯作者	Wen, Wei-Qiang(wenweiqiang@impcas.ac.cn) ; Ma, Xin-Wen(x.ma@impcas.ac.cn)
英文摘要	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.
资助项目	Youth Innovation Promotion Association of the Chinese Academy of Sciences
WOS关键词	DIELECTRONIC RECOMBINATION ; RADIATIVE RECOMBINATION ; RATE COEFFICIENTS ; FE
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000521486100001
资助机构	Youth Innovation Promotion Association of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/140690]
专题	中国科学院近代物理研究所
通讯作者	Wen, Wei-Qiang; Ma, Xin-Wen
作者单位	1.Univ Sci & Technol China, Dept Modern Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Khan, Nadir,Huang, Zhong-Kui,Wen, Wei-Qiang,et al. Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm*[J]. CHINESE PHYSICS B,2020,29(3):7.
APA	Khan, Nadir.,Huang, Zhong-Kui.,Wen, Wei-Qiang.,Wang, Shu-Xing.,Wang, Han-Bing.,...&Ma, Xin-Wen.(2020).Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm*.CHINESE PHYSICS B,29(3),7.
MLA	Khan, Nadir,et al."Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm*".CHINESE PHYSICS B 29.3(2020):7.