Transmission Of Low-Energy Electron In PET Microporous Membrance

In the process of low-energy electrons transmit through insulated micro-nanostructures,the experimental results of low-energy electrons with different energies are quite different,which lead to great controversy on the physical transmission mechanism of electron-guiding effect among researchers.In this paper,the low-energy electron beam with energy of 1500 keV is used to transmit through PET microporous membranes with aperture of 200 nm,400nm and800 nm respectively.The transmission of electrons in different size microporous membranes have been studied by measuring the two-dimensional angular distribution of transmission electrons.The experimental results show that during the charging stage,when electrons propagate in 200 nm PET microporous membranes,when the initial beam current is strong,the transmission electron intensity decreases with the charging time.When the beam current is weak,the transmission electron intensity increases with the charging time.When electrons transmit in 400 nm and 800 nm PET microporous membranes,the transmission intensity of electrons with changes time as in 200 nm PET microporous membranes with smaller beams.After charging,the angular distribution centers of transmission electrons do not move with the inclination angle of the membrane after transmit through 200 nm and 400 nm PET microporous membrane.In 800 nm PET microporous membrane,the two-dimensional angular distribution centers of transmission electrons move in the opposite direction to the angle of the microporous membrant,which is completely different from the relationship between the angular distribution of transmitted ions and the angle of the microporous membrant in the ion-guiding effect.In addition,some electrons lose energy and secondary electrons are produced in the process of electron transport in200 nm PET microporous membranes.However,no secondary electrons were produced in the process of 400 nm PET microporous membranes.