Total Cross Sections for Electron Scattering on Polyatomic Molecules （CH4, CO2,NO2, and N2O） at 10～3000 eV

A new modified formulation of the Additivity Rule (AR) was proposed to calculate the total electron scattering cross sections for CH4, CO2, NO2, and N2O, considering the overlapping between atoms in molecules and the not fully transparency of the molecules. The present calculation covers the range of impact energy from 10 to 3000 eV. The results are compared with experimental data and other theories where available. The atoms are presented by spherical complex optical potential, which is composed of static, exchange, polarization, and absorption terms.

Some Aspects of Nuclear Structure in Relativistic Approach

The nucleon effective interaction in the nuclear medium is investigated in the framework of the DiracBrueckner-Hartree-Fock (DBHF) approach. A new decomposition of the Dirac structure of nucleon self-energy in the DBHF is adopted for asymmetric nuclear matter. The properties of finite nuclei are investigated with the nucleon effective interaction. The agreement with the experimental data is satisfactory. The relativistic microscopic optical potential in asymmetric nuclear matter is investigated in the DBHF approach. The proton scattering from nuclei is calculated and compared with the experimental data. A proper treatment of the resonant continuum for exotic nuclei is studied. The width effect of the resonant continuum on the pairing correlation is discussed. The quasiparticle relativistic random phase approximation based on the relativistic mean-field ground state in the response function formalism is also addressed.

基片表面倾斜及衍射对激光会聚原子沉积条纹的影响

目的:探究基片对激光会聚原子沉积的影响。方法:根据光学势阱中原子运动的轨迹方程,对会聚场的光学势阱、原子运动轨迹和沉积条纹等进行了仿真实验。结果:衍射式光学势阱使原子轨迹提前会聚,进而与倾斜角一起对沉积条纹的质量参数产生了影响。在正倾时,随着|x0|的增大,条纹半高宽增大,条纹峰值减小;在负倾斜时,随着|x0|的增大,条纹半高宽保持不变,条纹峰值增大;同时随着|x0|的增大,沉积条纹的峰值位置相对于波节的偏移量趋向单调增大。在非衍射条件下,偏移量增大4 nm;在衍射条件下,偏移量增大15 nm。结论:由于衍射的存在,不管基片表面正倾斜还是负倾斜,基片表面上方沿着z方向都会存在一个直边衍射式的光学势阱。