电子束团中库仑相互作用对时间分辨电子衍射确定结构参数的影响
The influence of the Coulomb interaction in electron bunch on the structural parameters determined by time-resolved electron diffraction
摘要：
过渡到时间分辨率的顺序为1 ps或更少的提出了一些问题与估计的动态参数的准确性的基础上分析随时间变化的散射强度。超短脉冲的使用导致需要增加总曝光时间和延长数据采集时间。这可以通过增加每个脉冲的电荷而在一定程度上减轻。然而，电子数量的增加受到它们之间的库仑排斥的限制，这一方面导致衍射图案的失真，另一方面增加脉冲的持续时间。本文提出了一种分析方法，用于估算持续时间小于10ps的电子束团中电子的库仑排斥所引起的衍射图样的变形，以及这种效应对原子间距测量精度的影响。
英文摘要：
Transition to temporal resolution on the order of 1 ps or less raises a number of questions associated with estimation of the accuracy of the dynamic parameters based on the analysis of time-dependent scattering intensity. The use of ultrashort pulses leads to the necessity for increasing the total exposure time and lengthening the time of data acquisition. This can be to some extent mitigated by increasing the charge per pulse. Increasing in the number of electrons, however, is limited by the Coulomb repulsion between them, which leads on one hand, to distortion of the diffraction pattern, and the other hand to increase the duration of the pulse. The analytical technique for estimating the deformation of the diffraction pattern caused by the Coulomb repulsion of the electrons in the electron bunch with duration of less than 10 ps, and the influence of this effect on the accuracy of determination of the interatomic distances is developed.
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