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

doi:10.1088/1674-1056/ab69eb

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.

Keywords: storage ring electron cooler highly charged ions radiative recombination enhancement

Received: 28 November 2019
Revised: 06 January 2020
Accepted manuscript online:

PACS:	34.80.Lx	(Recombination, attachment, and positronium formation)
	29.20.db	(Storage rings and colliders)
	32.30.-r	(Atomic spectra?)

Fund: 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).

Corresponding Authors: Wei-Qiang Wen, Xin-Wen Ma
E-mail: wenweiqiang@impcas.ac.cn;x.ma@impcas.ac.cn

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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) Enhancement of electron-ion recombination rates at low energy range in the heavy ion storage ring CSRm 2020 Chin. Phys. B 29 033401

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

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