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本工作测量了100 keV质子穿过倾角为+1?的聚碳酸酯(PC)纳米微孔膜后,出射粒子电荷态、位置的分布以及相对穿透率随时间的演化.实验发现,100 keV(E/q约为100 kV)质子穿过绝缘纳米微孔的物理机理与keV能区的导向过程有根本的不同.在实验测量初期,微孔内部无电荷沉积,质子主要通过在微孔内表面以下的多次随机二体碰撞过程为主要传输机理;而当充放电平衡后,微孔内部有明显的电荷斑,主要传输机理为电荷斑辅助的表面以上(或近表面)的镜面散射行为.这一物理图像使质子穿过微孔的物理认识更加深入和完整,也将促进百千电子伏质子微束的应用.
In this work, we measured the charge state, the distribution and the relative transmissivity of the exiting particles after the 100 keV proton passed through the polycarbonate (PC) nanoporous membrane with a tilt angle of +1 ° .It was found that 100 keV (E / q is about 100 kV). The physical mechanism of the proton passing through the insulated nanopores is fundamentally different from that of the keV region. In the initial stage of experimental measurement, no charges are deposited inside the micropores, The main transport mechanism is the multiple random two-body collision process below the surface. When the charge and discharge balance, there are obvious charge spots inside the micropore. The main transmission mechanism is the speckle scattering behavior above the surface (or near surface) The physical image of the proton through the microporous physical understanding of more in-depth and complete, but also will promote the application of electron microscopy proton electron beam.