Therefore, the behavior of the total number of electrons emitted from a sample for each beam electron is extremely significant to nondestructive low accelerating voltage operation and metrology [ 65 , 83 , 85 , 86 ].
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Therefore, the behavior of the total number of electrons emitted from a sample for each beam electron is extremely significant to nondestructive low accelerating voltage operation and metrology [ 65 , 83 , 85 , 86 ].