General expressions of the magnetic vector potential for multipole fields are derived.

推导出了用多极场空间谐波函数表示的磁矢位的通项表达式.

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The possibility of dynamic aberration correction by using electro - magnetic multipole fields is discussed.

讨论了采用不同的电磁多极场作为动态校正器的可能性.推导了圆形校正透镜、偏转校正场和四极、六极校正场引起的附加象差的公式.

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