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研究了高电荷态离子Arq+(q=16,17,18)入射金属Be,Al,Ni,Mo,Au靶表面产生的X射线谱.实验结果表明,Ar的Kα-X射线是离子在与固体表面相互作用过程中固体表面之下形成空心原子发射的.电子组态1s2的高电荷态Ar16+离子在金属表面中性化过程中,存在的多电子激发过程使Ar16+的K壳层电子激发产生空穴,级联退激发射Ar的Kα 特征X射线.Ar17+离子在金属表面作用过程中产生的X射线谱形与靶材料没有明显的关联,入射离子的Kα-X射线产额与其最初的电子组态有关,靶原子的X射线产额与入射离子的动能有关.
关键词:
高电荷态离子
空心原子
多电子激发
X射线 相似文献
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Guiding of 150 keV O6+ ions through nanocapillaries in an uncoated Al2O3 membrane: special time dependence of the transmission profile width 下载免费PDF全文
<正>This paper reports that the transmission of O6+ ions with energy of 150keV through capillaries in an uncoated Al2O3 membrane was measured,and agreements with previously reported results in general angular distribution of the transmitted ions and the transmission fractions as a function of the tilt angle well fitted to Gaussian-like functions were observed.Due to using an uncoated capillary membrane,ourψc is larger than that using a gold-coated one with a smaller value of(?),which suggests a larger equilibrium charge Q∞in our experiment.The observed special width variation with time and a larger width than that using a smaller(?) were qualitatively explained by using mean-field classical transport theory based on a classical-trajectory Monte Carlo simulation. 相似文献
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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. 相似文献
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对低速高电荷态Ar17+离子在与不同金属靶相互作用过程中放出的Ar离子K壳X射线的Kβ/Kα分支比及各分支K线平均能量进行了理论研究.在文献[28,29]的基础上,通过对实验数据的分析,得到了0.3—0.8玻尔速度之间的Ar17+离子与Be,Al,Ni,Mo,Au等金属相互作用过程中入射离子发出的X射线分支比及各分支平均能量.理论上,基于导带电子俘获模型和级联跃迁模型,建立耦合方程组,以解释实验主要结果,理论结果与实验符合较好.在此基础上讨论了低速高电荷态Ar17+离子在金属表面以下的空心原子形成及退激发过程中发射K壳X射线的物理图像. 相似文献
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We investigate the angular distribution of the transmitted 18keV negative ions Cl- through Al2O3 nanocapillaries of 50 nm in diameter and 10 μm in length. Elastic scattering ions and inelastic scattering ions are obtained simultaneously. The experimental result is partially consistent with the guiding effect. We can qualitatively explain our experimental result through a dynamic process. 相似文献
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Experimental study of cross-section ratios in the collisions of Cq+ and oq+(q= 1-4) on atomic helium in strong-interaction region 下载免费PDF全文
We have measured the cross-section ratios of helium induced by Cq+ and Oq+ (q=1-4) in an energy range from 20 keV/amu to 500 keV/amu, and obtained the two-dimensional spectra by employing the coincidence method combined with the MPA-3 data acquisition system. Hence, we obtain the ratios of total single-ionization cross-sections (SI, SC, SLSI, and DLSI), total double-ionization cross-sections (DI, DC, TI, SLDI, and DLDI) and cross-sections of every process (SI, SC, SLSI, DLSI, DI, DC, TI, SLDI, and DLDI), which induce the single-ionization and double-ionization, to the total cross sections respectively. The competitive relations between the reaction-channels and the experimental data law of each reaction-channel are revealed explicitly, and the qualitative explanations involved in those results are also presented accordingly. 相似文献
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This paper reports that the K x-ray spectra of the thin target 47Ag, 48Cd, 49In and 50Sn were measured by an HPGe semi-conductor detector in collisions with 84.5 MeV 6C4+ ions. Our experiment revealed the Kα x-ray energy shifts were not obvious and the Kβ1 x-ray energy shifts were about 90~110 eV. The simple model of Burch et al has been previously used to calculate the K x-ray energy shifts due to an additional vacancy in 2p orbit. The present work extends the model of Burch to calculate the x-ray energy shifts of multiple ionized atoms induced by heavy ions with kinetic energy of MeV/u. In addition to our experimental results, many other experimental results are compared with the calculated values by using the model. 相似文献