Electron Momentum Spectroscopy
Electron Momentum Spectroscopy
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DOI：
10.1071/ph860587
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
I. McCarthy
中科院分区：
文献类型：
--
作者：
I. McCarthy
对于足够高的电子能量（大于几百eV）和足够低的反冲动量（小于几个原子单位），原子或分子上非共面对称（e，2 e）反应的微分截面仅通过靶离子重叠取决于靶和离子结构。能量和动量的实验准则是，当能量和动量变化时，表观结构信息不改变。平面波冲量近似是反应机制的充分描述，用于确定原子和分子的动量空间轨道的球平均平方，以及描述初始和最终状态相关性的系数。对于主要是不相关的初始状态，光谱因子属于同一个流形的最终状态唯一确定。对于分子，可以针对不同的离子歧管比较求和的光谱因子。对于原子，求和的光谱因子和较高的动量分布需要离散波冲量近似。
For sufficiently high electron energies (greater than a few hundred eV) and sufficiently low recoil momenta Oess than a few atomic units) the differential cross section for the non-coplanar symmetric (e,2e) reaction on an atom or molecule depends on the target and ion structure only through the target-ion overlap. Experimental criteria for the energy and momentum are that the apparent structure information does not change when the energy and momentum are varied. The plane-wave impulse approximation is a sufficient description of the reaction mechanism for determining spherically averaged squares of momentum-space orbitals for atoms and molecules and for coefficients describing initial- and final-state correlations. For mainly uncorrelated initial states, spectroscopic factors for final states belonging to the same manifold are uniquely determined. For molecules, summed spectroscopic factors can be compared for different ion manifolds. For atoms, summed spectroscopic factors and higher-momentum profiles require the dist~rted-wave impulse approximation.