In essence, the beam pushes the lighter electrons away from the heavier positive ions, which in turn get left behind, creating a region of excess positive charge and a region of excess negative charge [see box above].
In essence, the beam pushes the lighter electrons away from the heavier positive ions, which in turn get left behind, creating a region of excess positive charge and a region of excess negative charge [see box above].
基本上，这会将较轻的电子从较重的离子中推开，这时候较重的离子会略为落后，而创造出一个带有较多正电荷的区域及另一个带有较多负电荷的区域（参阅上方〈在电子泡泡里〉）。