基于重离子冷却储存环CSRm开展的类锂、类铍氩离子双电子复合实验研究

发布时间：2018-01-09 14:01

本文关键词：基于重离子冷却储存环CSRm开展的类锂、类铍氩离子双电子复合实验研究　出处：《中国科学院大学(中国科学院近代物理研究所)》2017年博士论文　论文类型：学位论文

【摘要】：配备电子冷却系统的重离子冷却储存环提供了相空间冷却的高品质束流和极低温度的电子束,极大提高了双电子复合(DR)实验的能量分辨和复合离子信号的信噪比,为研究高电荷态离子精密谱学提供了绝佳的实验平台。本文基于中科院近代物理研究所重离子研究装置HIRFL-CSRm上的DR实验装置,利用储存环合并束技术成功开展了类锂和类铍的氩离子的DR实验研究,主要结果包括:第一部分,在CSRm上开展了类锂的36Ar15+离子的DR刻度实验,成功测量了电子-离子质心系能量范围为0-35 eV的DR速率系数谱,覆盖了类锂的36Ar15+离子的2s电子所有?n=0的DR谱线系(1s22p1/2nl与1s22p3/2nl),通过解谱,给出了电子离子共线段电子束的温度分布(纵向温度kT|=0.8 meV,横向温度kT^=40 meV)。根据实验测量得到的DR谱中可分辨的共振峰位置,利用外推法得到了36Ar15+离子2s1/2→2p1/2和2s1/2→2p3/2的激发能分别为31.95±0.05 eV和35.00±0.08 eV。使用基于相对论组态相互作用的FAC程序对实验能量范围内的反应过程进行了计算,理论计算结果与实验结果符合很好。此外基于CSRm先后开展的36,40Ar15+离子的DR实验结果对储存环DR实验方法测量同位素移动进行了探索研究,对于CSRm上未能观察到36,40Ar15+同位素移动的原因进行了分析;第二部分,基于类锂的36Ar15+的DR刻度实验,开展了类铍的~(40)Ar~(14+)离子的DR实验研究。成功观测到了~(40)Ar~(14+)的DR(2s2→2s2p)过程的?n=0的四个谱线系2s2p 1P1、2s2p 3PJ(J=0,1,2)以及三电子复合TR(2s2→2p2)过程?n=0的各个线系1S0、1D2、3P2、3P1、3P0。利用AUTOSTRUCTURE程序对~(40)Ar~(14+)的共振复合过程进行了理论计算,计算结果与实验结果总体符合较好。CSRm上开展的类锂、类铍氩离子的DR实验研究,为在CSRe以及我国未来大科学装置HIAF(High Intensity Heavy-ion Accelerator Facility)上的DR精密谱学研究奠定了坚实的基础。
[Abstract]:Heavy ion cooling cooling system equipped with electron storage ring provides high quality beam phase space cooling flow and low temperature of the electron beam, which greatly improves the dielectronic recombination (DR) experiment of compound ion energy resolution and signal-to-noise ratio, which provides excellent experimental platform of highly charged ions precise spectroscopy DR. This experimental device of modern physics Research Based on the heavy ion research facility in HIRFL-CSRm, the use of storage and cyclization beam technology successfully carried out the experimental study of DR argon ion lithium and beryllium. The main results include: first, to carry out the DR 36Ar15+ type lithium ion scale experiment on CSRm success measurement of the electron ion mass system energy is in the range of DR rate coefficient 0-35 eV spectrum, 36Ar15+ ion covering lithium 2S n=0 all? DR spectrum lines (1s22p1/2nl and 1s22p3/2nl), through the spectrum, are given The segment of the electron beam ion electron temperature distribution (longitudinal temperature kT|=0.8 meV kT^=40 meV, the transverse temperature). According to the resonance peak resolution the measured DR spectra, obtained by extrapolation of excitation energy were 31.95 + 0.05 and 35 + 0.08 eV eV. using relativistic configuration interaction FAC reaction process the range of experimental energy based on the calculated 36Ar15+, 2p1/2 and 2s1/2 ions 2s1/2 and 2p3/2, the theoretical calculation results agree well with experimental results. In addition DR 36,40Ar15+ CSRm has carried out the experimental ion based on the results of storage ring DR experimental method for measuring isotope shift was studied for CSRm reasons were not observed 36,40Ar15+ isotope shifts are analyzed; the second part, the DR scale experimental class lithium based 36Ar15+, carried out the berylliumlike ~ (40) Ar~ (14+) experimental study of DR ion. Success was observed by ~ (40) Ar~ (14+) DR (2s2, 2s2p) process? Four line n=0 2s2p 1P1,2s2p 3PJ (J=0,1,2) and three TR (2s2 - 2P2 electronic composite) process? Each line of the n=0 1S0,1D2,3P2,3P1,3P0. system using AUTOSTRUCTURE program for ~ (40) Ar~ (14+ the composite process of resonance) theoretical calculation, the calculated results and the experimental results accord with the overall development better on the.CSRm class DR class beryllium lithium, experimental study of argon ion in CSRe as well as our future scientific devices HIAF (High Intensity Heavy-ion Accelerator Facility) on the DR precision spectroscopy research has laid a solid foundation.

【学位授予单位】：中国科学院大学(中国科学院近代物理研究所)
【学位级别】：博士
【学位授予年份】：2017
【分类号】：O571.6

【相似文献】