GEC Student Award for Excellence Finalist: Atomic and Molecular Signatures for charged particle ionization
GEC Student Award for Excellence Finalist: Atomic and Molecular Signatures for charged particle ionization
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DOI：
10.1038/nphys1135
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
O. Al-Hagan;D. Madison;C. Kaiser;A. Murray
中科院分区：
文献类型：
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作者：
O. Al-Hagan;D. Madison;C. Kaiser;A. Murray
原子和分子在带电粒子的撞击下电离的方式对许多物理系统的行为有着重要的影响，从气体激光到天体物理等离子体。我们对这一过程的理解大多来自于对入射电离束轨迹所在的同一平面内喷射出的电子的能量和角分布的电离测量。这些研究表明，控制原子和分子电离的机制本质上是相同的。但是，通过测量从垂直于入射光束的平面内的气体中射出的电子，我们发现情况并非总是如此。实验和量子力学计算使我们能够构建一个非常准确的带电粒子电离物理学的经典图像。该模型预测，电离行为的差异出现在质量中心没有原子核的分子中。
The way in which atoms and molecules are ionized by the impact of charged particles has important consequences for the behaviour of many physical systems, from gas lasers to astrophysical plasmas. Much of our understanding of this process has come from ionization measurements of the energy and angular distribution of electrons ejected in the same plane as the trajectory of the incident ionizing beam. Such studies suggest that the mechanisms governing the ionization of atoms and molecules are essentially the same. But by measuring the electrons ejected from a gas in a plane perpendicular to the incident beam, we show this is not always the case. Experiments and quantum mechanical calculations enable us to construct a remarkably accurate classical picture of the physics of charged-particle ionization. This model predicts that the differences in ionization behaviour arise in molecules that do not have nuclei at their centres of mass.