激发态钛和镍原子光电离研究(英文)  

Investigation on the Photoionization of Titanium and Nickel in Exicited States

作　　者：程颐[1] 吴宏霞[1] 胡行勇[1] 从然[1] 樊建梅[1] 杨家君[1] 季学韩[1] 郑贤锋[1] 崔执凤[1] 

机构地区：[1]安徽师范大学物理与电子信息学院,安徽芜湖241000

出　　处：《安徽师范大学学报（自然科学版）》2010年第1期21-27,共7页Journal of Anhui Normal University(Natural Science)

基　　金：Sponsored by the National Science Foundation of China(10674002,20973001,20703001)

摘　　要：本文报道了在285-320纳米波长范围内钛和镍原子多光子电离研究结果。采用激光烧蚀和分子束相结合的技术制备金属原子,光离子产物由飞行时间质谱仪检测。根据光离子信号对探测激光强度依赖关系抽取出Ti和Ni原子激发态光电离截面。测量的光电离截面在0.2 Mb到6.0 Mb之间。在阈限电离区,Ti和Ni同位素原子激发态的光电离截面实验值是相同的。The resonance-enhanced multiphoton ionization of Ti and Ni atoms has been investigated in the range of 285 - 320 nm. The atoms are produced by the laser ablation of a metal sample. The Ions produced from photoionization of the neutral atoms are monitored by a home-built TOF mass spectrometer. The photoionization cross sections of the excited states of Ti and Ni are deduced from the dependence of the correspending ion signal on the laser intensity with photon energies close to the ionization threshold, the assuming saturation of the resonant transition. The obtained values range from 0.2 Mb to 6.0 Mb. No significant isotope-dependence is found from the measurements of the photoionization cross sections of 46Fi, 47Ti, 47Ti, 58Ni, and 60Ni.

关 键 词：光电离截面 钛 镍 

分 类 号：O562.4[理学—原子与分子物理]