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电子碰撞

电子碰撞的相关文献在1987年到2022年内共计112篇,主要集中在物理学、化学、原子能技术 等领域,其中期刊论文79篇、会议论文18篇、专利文献696542篇;相关期刊34种,包括全球科技经济瞭望、北华大学学报(自然科学版)、湖南文理学院学报(自然科学版)等; 相关会议12种,包括第十四届全国原子与分子物理学术会议、2006中国工程热物理学会燃烧学学术会议、第十届高功率粒子束学术交流会等;电子碰撞的相关文献由191位作者贡献,包括周忠源、安竹、王炎森等。

电子碰撞—发文量

期刊论文>

论文:79 占比:0.01%

会议论文>

论文:18 占比:0.00%

专利文献>

论文:696542 占比:99.99%

总计:696639篇

电子碰撞—发文趋势图

电子碰撞

-研究学者

  • 周忠源
  • 安竹
  • 王炎森
  • 方泉玉
  • 朱林繁
  • 朱颀人
  • 邹宇
  • 钱兴中
  • 陈重阳
  • 刘慢天
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 王严; 李雪; 尹文禄; 蔚娜; 娄鹏
    • 摘要: 本文对比分析了利用ITU半经验模型和3种电子碰撞模型预测天波链路电离层吸收衰减的方法.利用中国参考电离层模型和质谱仪非相干散射大气模型构建背景电离层和背景大气,在构建的背景环境中利用三维射线追踪方法仿真分析由半经验模型和3种电子碰撞模型计算得到的电离层吸收衰减与电波频率、出射仰角、大圆距离的关系.并进行了大圆距离100 km、200 km、400 km的短波通信测试试验,分析了各预测方法的准确度.从试验结果来看:日间两类模型性能差异不大,而日落期利用电子碰撞模型预测得到的电离层吸收衰减优于以往采用的ITU半经验模型;在可用频段的较大频率处,实测值更接近电子碰撞模型.仿真与试验均证实3种电子碰撞模型预测值相近,根据实际可获得大气中性成分数据.
    • 陈冰
    • 摘要: 量子反常霍尔效应解决了不用外磁场就能解决电子碰撞发热的问题。采用这种效应设计集成电路和元器件,有望克服目前计算机发热耗能等带来的一系列问题!2020年,对于中国科学院院士、南方科技大学校长、北京量子信息科学研究院院长薛其坤而言,非常特别。年初,他获得了2020年度菲列兹·伦敦奖。
    • 高小飞; 李浩; 孟鑫; 田善喜
    • 摘要: 离子对解离是一类重要的分子过程,常发生于分子被激发到超激发态.与光激发的离子对解离实验研究不同,电子碰撞的相关过程研究尚存在实验挑战,特别是在测定其阈值方面.本文报道了相关的利用单色化电子碰撞分子的实验研究进展.以BrCN→Br^-+CN^+离子对解离为例,根据CN^+离子出现能测定其解离阈值为13.78 eV,同时在16.09 eV获得了CN^+离子的时间切片速度影像且显示出动量分布的各向异性.
    • 冉崇阳; 徐龙泉; 刘亚伟; 朱林繁
    • 摘要: The generalized oscillator strengths of a″1Σ+g(v′ =0)and a″1Σ+g(v′ =1) +b1Πu(v′ =0)of molecu-lar nitrogen were measured at a high incident electron energy of 1500 eV and a high energy resolution of 70 meV with the aid of the relative flow technique. The present results are apparently different from the X-ray scattering ones in the large momentum transfer region,which indicates that for a″1Σ+g(v′ =0)the first-order Born approx-imation is not satisfied at the incident electron energy E0= 1500 eV in the large momentum transfer region. The agreement of the present results with the X-ray scattering ones for a″1Σ+g(v′ = 1) +b1Πu(v′ = 0)in K2< 2 a.u. indicates that the first-order Born approximation is satisfied at the incident electron energy E0= 1500 eV for b1Πu(v′ = 0).%利用快电子能量损失谱仪结合相对流量技术,在入射电子能量1500 eV和能量分辨70 meV的条件下,测量了氮分子a″1Σ+g(v′ = 0)和a″1Σ+g(v′ = 1) +b1Πu(v′ = 0)激发态的广义振子强度.通过与已有的电子散射结果以及X射线散射结果对比发现,对于a″1Σ+g(v′ =0)和a″1Σ+g(v′ =1) +b1Πu(v′ =0),我们的结果与X射线散射结果在大动量转移出现差异,这表明对a″1Σ+g(v′ = 0)和a″1Σ+g(v′ = 1),即使入射电子能量1500 eV 也没有达到一阶玻恩近似条件.在动量转移平方小于2 a.u.时,a″1Σ+g(v′ = 1) +b1Πu(v′ = 0)与X射线散射结果的符合表明,对b1Πu(v′ = 0),1500 eV入射电子能量已经达到一阶玻恩近似条件.
    • 谭文静; 安竹; 朱敬军; 赵建玲; 刘慢天
    • 摘要: Bremsstrahlung emission produced by electron impact on thick or thin targets is one of the fundamental radiation processes, and the interest in its study continues to grow because of its importance for understanding the interaction of electrons with matter and also for many practical applications. Nowadays, there has been some disagreement concerning whether or not the polarization bremsstrahlung, which is emitted by the atomic electrons in a target polarized by the incident charged particles, contributes to the total bremsstrahlung when the incident electrons bombard a solid target. Some reports suggested that the polarization bremsstrahlung does not significantly contribute to the total bremsstralung in experiments involving solid targets. However, some recent experimental data indicated that a significant amount of polarization bremsstrahlung contributes to the total bremsstrahlung when electrons from β-decays of radioactive nuclei bombard solid targets. In other papers, the comparison between the bremsstrahlung spectra produced by electron impact on different thick solid targets from low-Z to high-Z elements and the simulation spectra of Monte Carlo code PENELOPE showed that there are certain discrepancies between the experimental and simulation results, and on the whole the factors required for the experimental results and simulation spectra to match with each other seem to increase slightly with the target atomic number increasing and for high-Z elements experimental results are about 10% higher than simulation results. PENELOPE is a general-purpose Monte Carlo code that simulates coupled electron-photon transportation, in which simulation for bremsstrahlung is only based on ordinary bremsstrahlung and any contribution from polarization bremsstrahlung is not included. Therefore, whether the discrepancies between the experimental and simulation spectra are caused by the polarization bremsstrahlung or by other reasons remains to be further studied. In this paper, we improve the Faraday cup to measure the incident electron charges more accurately. Meanwhile, a high-purity Al film of 7.05 µm thickness is placed in front of the ultra-thin window of the X-ray silicon drifted detector (SDD) to prevent the backscattered electrons that escape from the side hole of the Faraday cup entering into the SDD detector. The Al film thickness is measured by the method of Rutherford backscattering. In addition, we adopt a data processing method which is different from previous one, to take into account the interaction between backscattered electrons and the window of the SDD detector. New measurements of bremsstrahlung spectra generated by 10–25 keV electron impact, respectively, on thick targets of tungsten and gold are reported in this paper. The experimental data are compared with the simulation results of X-ray spectra obtained from the PENELOPE code, and they are in very good agreement except for the lower energy region (<3 keV) where the experimental spectra are slightly lower than the simulation spectra. The reason for the small discrepancy for the lower energy region (< 3 keV) is also discussed. The results presented in this paper indicate that the X-ray spectra, which are produced by electron impact on solid targets, do not include obvious contribution of polarization bremsstrahlung, and the PENELOPE code can reliably describe the bremsstrahlung produced by electron impact on solid thick targets.
    • 陆根萌; 刘亚伟; 徐龙泉; 张鑫; 康旭; 朱林繁
    • 摘要: 为了提高原子分子动力学参数的测量精度,本文把气体相对流量技术应用到快电子碰撞研究中.并且在此基础上测量了氙原子6s激发的广义振子强度,所得结果在小动量转移区间与前人的结果符合很好,表明气体相对流量技术在电子碰撞方法中的适用性.大动量转移区间6s的表观广义振子强度对电子碰撞能量的依赖行为,说明500 eV的电子碰撞能量还不满足一阶玻恩近似条件.与Hartree-Fock方法相比,考虑电子关联效应更全面的随机相移近似计算结果与本文的实验结果符合更好,说明对于像Xe这样的重原子,电子关联效应十分重要.
    • 谭文静; 安竹; 朱敬军; 赵建玲; 刘慢天
    • 摘要: 测量了10—25 keV电子碰撞厚W,Au靶产生的韧致辐射谱,并与Monte Carlo程序PENELOPE模拟的X射线谱进行了比较,除在3 keV前实验谱略低于理论谱外,整体上两者符合得很好.在模拟电子与靶材料相互作用产生韧致辐射时,PENELOPE程序中只包含有普通韧制辐射的截面数据.实验结果表明,在电子与固体靶相互作用时,没有明显的极化韧致辐射产生,PENELOPE程序能够可靠地描述电子与固体厚靶相互作用产生的韧致辐射.
    • 摘要: 高速运动的电子具有波的性质。当高速电子束照射到金属表面时,电子能深入金属表面一定深度,与基体金属的原子核及电子发生相互作用。电子与原子核的碰撞可看作为弹性碰撞,因此能量传递主要是通过电子束的电子与金属表层电子碰撞而完成的。所传递的能量立即以热能形式传于金属表层原子,从而使被处理金属的表层温度迅速升高。
    • 段斌
    • 摘要: 电子碰撞是等离子体中引起谱线展宽的最重要的物理机制之一,是指处于激发态而发生辐射的原子或离子因受到周围质量轻但运动快的电子扰动而导致的谱线增宽。它最早在1958年由Baranger研究并称之压力展宽,后来称为碰撞近似。然而,由于完全量子计算相当复杂且极其困难,相关研究很少见。
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