X-Ray Emission from Zr, Mo, In and Pb Targets Bombarded by Slow Highly Charged Ar^q＋（q = 13, 14, 15, 16） Ions

We study the L x-ray emission from Zr, Mo and In targets and M x-ray emission from Pb target under bombardment of low energy Ar^q (q = 13, 14, 15, 16) ions. The relative x-ray yields were measured in the projectile kinetic energy range 210-360 keV. It is found that the relative x-ray yields from Zr, Mo and Pb targets increase with the increasing projectile kinetic energy for Ar^14 and Ar^16 projectiles and depend on the potential energy of the projectile remarkably.     

180keV O6+离子与锥形玻璃毛细管相互作用研究

实验研究了强流（几个nA/mm2）180 keV O6+离子穿越微米尺度锥形玻璃毛细管的聚焦效应.结果表明,毛细管出口处束流密度比入口处束流密度增加了6~7倍,且出射离子保持原有的电荷态及能量.此外我们发现,当毛细管倾斜一定角度时,离子出射方向偏向毛细管管轴方向.基于自组织充电模型对上述实验结果进行了讨论.     

Influence of core property on multi-electron process in slow collisions of isocharged sequence ions with neon

Influence of core property on multi-electron process in the collisions of q=6-9 and 11 isocharged sequence ions with Ne is investigated in the keV/u region.The cross-section ratios of double-,triple-,quadruple-and total multi-electron processes to the single electron capture process as well as the partial ratios of different reaction channels to the relevant multi-electron process are measured by using position-sensitive and time-of-flight techniques.The experimental data are compared with the theoretical predictions including the extended classical over-barrier model,the molecular Columbic barrier model and the semi-empirical scaling law.Results show a core effect on multi-electron process of isocharge ions colliding with Neon,which is consistent with the results of Helium we obtained previously.     

利用HIRFL-CSR开展分子离子复合离解研究的可行性分析

介绍了储存环高精度分子谱学研究的科学意义、 国内外研究现状和利用HIRFL-CSR开展该项研究的优势, 着重论证了HIRFL-CSR分子离子注入实验环的总体设计方案和技术方案。 通过在HIRFL-CSR实验环上增建一条分子离子注入线, 将实验环改造成能兼顾现有物理实验和大分子物理研究的综合性研究平台, 为分子离子复合离解研究提供良好的技术支撑。 特别是质量数大于70的分子离子, 能显著提高其能量分辨。 In the present paper, it is introduced the scientific background and the current status of the high precision spectroscopy of the molecular ions at cooler storage ring. The advantages to study the dissociative recombination(DR) processes using cooler storage ring CSRe are discussed. The physics design,the main parameters of the injection beam line and the injection of the molecular ions into the CSRe and the key techniques are described in detail. With a new injection beam line,HIRFL-CSRe will be reconstructed to a multi discipline research platform,offering good opportunities for the study of DR processes of molecular ions,especially for that of the molecular ions of m>70 amu with much improved resolution.     

Multi-Electron Processes in 4.15-11.08 keV/u^13C^6＋ on Argon Collisions

The relative partial cross sections for ^13C^6＋ -Ar collisions at 4.15-11.08 ke V/u incident energy are measured. The cross-section ratios σ^2E/σ^SC, σ^3E/σ^SC, σ^4E/σ^SC and σ^SE/σ^SC are approximately the constants of 0.514-0.05, 0.204-0.03, 0.064-0.03 and 0.024-0.01 in this region. The significance of the multi-electron process in highly charged ions （HCIs） with argon collisions is demonstrated （σ^ME/σ^SC as high as 0.794-0.06）. In multi-electron processes, it is shown that transfer ionization is dominant while pure electron capture is weak and negligible. For all reaction channels, the cross-sections are independent of the incident energy in the present energy region, which is in agreement with the static characteristic of classic models, i.e. the molecular Coulomb over-the-barrier model （MCBM）, the extended classical over-the-barrier model （ECBM） and the semiempirical scaling laws （SL）. The result is compared with these classical models and with our previous work of ^13C^6＋ -Ne collisions [Chin. Phys. Lett. 23 （2006） 95].     

180 keV O6+离子与锥形玻璃毛细管相互作用研究

实验研究了强流（几个nA/mm²）180 keV O⁶⁺离子穿越微米尺度锥形玻璃毛细管的聚焦效应.结果表明,毛细管出口处束流密度比入口处束流密度增加了6～7倍,且出射离子保持原有的电荷态及能量.此外我们发现,当毛细管倾斜一定角度时,离子出射方向偏向毛细管管轴方向.基于自组织充电模型对上述实验结果进行了讨论.     

84.5MeV 12C4+离子诱发金属靶原子发射的Kβ与Kα-X射线强度比值的研究

本实验是在中国科学院兰州近代物理研究所, 国家实验室的重离子加速器上完成的. 实验用ORTEC公司生产的HPGe X射线探测器测量了84.5MeV的12C4+离子轰击Cu, Mo, Ag, Cd, In, Sn, W和Au金属靶产生的K壳层特征X射线谱, 计算了Kβ与Kα-X射线强度的比值, 并将结果与Scofield用Hartree-Fock-Slater模型计算出的理论值与用其它方法 (如: 衰变幅射, 用光子, 电子, 质子等粒子与靶相互作用) 得到的实验值进行了比较. 比较结果表明用84.5MeV的12C4+离子轰击Cu, Mo, Ag, Cd, In, Sn, W和Au金属靶产生的Kβ与Kα-X射线强度比值比理论值和其它实验值要大许多.     

127°径向位置灵敏柱形静电离子能谱仪

针对高电荷态离子与表面作用产生的溅射离子能谱测量,研制了一台127°径向位置灵敏柱形静电离子能谱仪。利用能量为800 keV的Ar8+离子轰击金属铍靶产生的溅射离子测试了本谱仪。 测试结果表明,该谱仪克服了传统静电谱仪通过扫描工作电压单能量点取谱的缺点, 实现分段取谱——在单个工作电压下可同时获取一段0.85Ec≤E≤1.15Ec范围的能谱, 从而提高测量效率。 A 127° electrostatic coaxial cylindrical energy spectrometer with a radial position sensitive MCP detector is designed for sputtering ions measurement. It has been tested by measuring the energy spectrum of the sputtering ions in the collision of 800 keV Ar8+ bombarding beryllium target. A segment of the energy spectrum (0.85Ec≤E≤1.15Ec) can be obtained at one working voltage (U), which is much efficient than the traditional point to point voltage scanning method.     

300和600keV O~(7+)离子与宏观玻璃管的相互作用

实验研究了300和600 ke V的O7+离子与宏观玻璃管内壁的相互作用,利用位置灵敏法拉第筒测量了传输离子的偏转角和传输效率随倾斜角的变化关系,观察到偏转角不等于倾斜角的不完全导向现象。实验结果证实,高能入射离子在玻璃管内壁产生的沉积电势相对于入射离子动能横向分量较小,难以使传输离子沿着玻璃管的轴向出射,从而发生不完全导向现象;并且,入射离子的能量越高,导向效应越不明显。     

镱钠共掺氟化钙锶混晶近红外光谱与激光参数

研究了15％Yb,20％Na:CaF2-SrF2混晶(Yb,Na:CaF2-SrF2,CaF2:SrF2=1:1)的近红外光谱和激光参数特性.研究显示,Yb,Na:CaF2-SrF2混晶在974 nm处吸收带宽为22 nm,吸收系数为13.09 cm-1,吸收截面为0.31×10-20 cm2.Yb3+离子在CaF2-...