来自《耶鲁大学开放课程：新生有机化学 第5集 第5集》

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  notice the scattering vector is perpendicular to that line.
  散射矢量是与这条直线相垂直的
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  So you say that this incoming wave was
  此时入射光
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  scattered perpendicular to this line.
  以法线为对称轴被散射
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  That's how a mirror works. Right?
  就像镜子一样 是吧
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  That angle is called the specular angle,
  这个角度叫做镜象角度
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  because speculum is the Latin word for mirror. Right?
  这个词源自拉丁文speculum[镜子]
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  So you're bound to get reinforcement at the specular angle,
  可见 在镜象角度上必然会发生增强
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  and you know that from having looked at mirrors.
  这是镜象关系所保证的
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  Now suppose there were another electron on that same line or plane.
  现在假设这条线上还有一个电子
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  For the same reason it's guaranteed to be in-phase.
  同理 其散射光在镜象角度也是同相位
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  So everything on that plane
  也就是说 这条线上的电子在镜象角度上
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  will scatter in-phase at that particular angle.
  散射光都是同相位的