磷脂酰乙醇胺双分子层膜低能电子散射的Monte Carlo模拟

Monte Carlo simulations on electrons scattering in phosphatidylethanolamine bilayer membrane under the action of low energy electrons

基于“亲水层-疏水层-亲水层”模型,采用Monte Carlo方法模拟了低能电子束(能量E0≤900 eV)作用下,磷脂酰乙醇胺(PE)双分子层膜的电子散射,研究了PE膜散射电子(SEs)、背散射电子(BSEs)的深度与表面分布,BSEs、透射电子(TEs)的能量分布,以及SEs的能量沉积.研究表明,入射电子束能量E0越小,PE膜的TEs就越少,BSEs就越多,被PE膜吸收的电子就越多,BSEs图像的分辨率就越高;入射电子束能量E0越小,PE膜能量接近E0的BSEs就越多,能量接近E0的TEs就越少;PE膜亲水层的背散射能力明显高于疏水层;随着E0的增大,SEs在PE膜中的能量沉积密度增大,但沉积范围先增大,后减小.

Basing on the model of ＂hydrophobic layer- hydrophilic layer- hydrophobic layer＂, Monte Carlo simulations were performed to investigate the energy and space distributions of electrons scattering in the phosphatidylethanolamine （PE） bizlayer membrane under the action of low energy electrons（incident electron energy E0≤900 eV）. Further the depth and surface distributions of scattering electrons （SEs） and backscattering electrons （BSEs）, energy distributions of BSEs and transmission electrons （TEs）, and the energy aggradation in the PE membrane were analyzed. It is shows that the smaller energy E0 of incident electrons is, the fewer the TEs is, the more the BSEs is, and the more the absorbed electrons by the PE membrane, that the smaller E0 is, the more the BSEs with the energy close to E0 is and the less the TEs with the energy close to E0 is, that the hydrophobic layers have the better backscattering capabilities than the hydrophilic layer, and that, with the increase of the E0, the energy aggradation density of the SEs in the PE membrane increases, but the aggradation range increases first and then decreases.