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无论对深入理解电子-原子的作用机制,还是在材料等领域的实际应用,电子轰击原子的内壳电离截面都具有重要意义。当前电子碰撞引起原子内壳电离的实验数据多集中在几十ke V入射能量和中小Z靶原子,其它数据相对比较缺乏。本工作以能量为1.0 Me V电子轰击Ta和Au靶,通过测量靶原子特征X射线的产额,获得其K壳电离截面分别为13.3和10.1 b,L壳电离截面分别为554和338 b。并将实验结果和相应的理论进行了对比,结果显示,本实验测得的K壳电离截面与Casnati、Hombourger理论值、L壳电离截面与Scofield和Born-Bethe的理论值相符。 相似文献
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利用HIRFL-CSR开展分子离子复合离解研究的可行性分析 总被引:1,自引:0,他引:1
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。 相似文献
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Influence of core property on multi-electron process in slow collisions of isocharged sequence ions with neon 下载免费PDF全文
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. 相似文献
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X-Ray Emission from Zr, Mo, In and Pb Targets Bombarded by Slow Highly Charged Ar^q+(q = 13, 14, 15, 16) Ions 总被引:1,自引:0,他引:1 下载免费PDF全文
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. 相似文献
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采用位置灵敏探测和飞行时间技术测量了等电荷态离子C^q 、N^q 、O^q 、Ne^q (q=4,5,6,7)与He原子碰撞中,转移电离截面与单电子俘获截面的比值Ro研究了相同q入射的情况下,R与入射离子核电荷数Z的依赖关系。在统计蒸发模型的基础上对实验结果进行了解释。 相似文献
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利用2~8 MeV的Naq+、Clq+(q=2,3,4,5)轰击氦原子,对碰撞的直接多重电离过程进行研究.实验采用反冲离子-散射离子飞行时间符合技术,通过反冲离子飞行时间谱区分不同价态反冲离子;利用静电偏转和位置灵敏探测技术区分不同电荷态散射离子;结合CAMAC-PC多参数获取系统得到一定价态散射离子所对应的反冲离子电荷态分布谱;经分析该谱得到直接多重电离截面与直接单电离截面之比R21.讨论了R21随入射离子速度和电荷态的变化关系. 相似文献
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采用位置灵敏探测和散射离子 反冲离子飞行时间技术测量了强相互作用区F2 + 和F3 + 离子与Ne原子碰撞中的转移电离截面与单电子俘获截面之比 .与Fq+ He实验结果进行了比较 ,并进行了定性讨论. The ratios of the cross-section of the transfer ionization to the single electron capture of Neon induced by F 2+ and F 3+ ions are measured by means of the time-of-flight technologie. In the present energy range, the transfer ionization C1I1 of neon can be considered as a two-step process, in which one electron is captured by projectile and another one is directly ionized, and the transfer ionization C1I2 process should be considered as a subsequent rearrangement of neon following... 相似文献
9.
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]. 相似文献
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