Fig. 10
The summary chart, 12 balance scenarios of electron beam bombarding a dielectric surface when the surface potential is charged in three cases. Case (1), the surface potential reaches a specific value that makes the final beam collision energy 0; Case (2), the surface potential is finally stabilized at a state slightly larger than 0; Case (3), the surface potential equals a specific negative value that makes the final electron beam collision energy be Ep2.
