Theoretical study on non-sequential double ionization of carbon disulfide with different bond lengths in linearly polarizedlaser fields

By using a two-dimensional Monte-Carlo classical ensemble method, we investigate the double ionization(DI) process of the CS_2 molecule with different bond lengths in an 800-nm intense laser field. The double ionization probability presents a "knee" structure with equilibrium internuclear distance R = 2.9245 a.u.(a.u. is short for atomic unit). As the bond length of CS increases, the DI probability is enhanced and the "knee" structure becomes less obvious. In addition,the momentum distribution of double ionized electrons is also investigated, which shows the momentum mostly distributed in the first and third quadrants with equilibrium internuclear distance R = 2.9245 a.u. As the bond length of CS increases,the electron momentum becomes evenly distributed in the four quadrants. Furthermore, the energy distributions and the corresponding trajectories of the double-ionized electrons versus time are also demonstrated, which show that the bond length of CS in the CS_2 molecule plays a key role in the DI process.     

反相高效液相色谱法测定鬼灯檠中岩白菜素的含量

建立了反相高效液相色谱法测定鬼灯檠中岩白菜素的含量。色谱柱为SymmetryC18柱(5μm,4.6mm×150mm),流动相为甲醇水(1∶3),流速为1.0mL·min-1,柱温30±1℃,检测波长为275nm。该方法线性范围为0.8～4.0μg(r=0.9987),平均加标回收率为100.5%,岩白菜素的相对标准偏差为1.6%(n=6),检出限为0.1ng。方法快速,简单,灵敏度高。