纳秒激光电离产生Kr^(17+)的研究  

Generation of Multicharged Krypton Ions in Nanosecond Laser Ionization of Krypton Beam

作　　者：罗晓琳[1] 孔祥蕾[1] 牛冬梅[1] 渠洪波[1] 李海洋[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031

出　　处：《Chinese Journal of Chemical Physics》2004年第1期4-6,共3页化学物理学报（英文）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina (2 0 0 73 0 42 )andtheGrant 863ProgramofChina(2 0 0 2AA6490 10 ;2 0 0 1AA640 3 0 2 )

摘　　要：Up to Kr 17+ multicharged krypton ions have b ee n observed in time-of-flight mass spectrum by a 25 ns Nd-YAG 1.064 μm laser at laser intensity about 10 12 W/cm 2. Experimental results indicate that the multicharged ions appear only when the laser interacts with the middle part of the pulsed beam,and the intensities of the multicharged ions increase dramat ically by increasing the backing pressure of Kr gas, which indicates that the cl usters in the beam is essential to the production of multicharged ions. From the experimental results, it is concluded that the cluster is ionized via multiphot on ionization and forms a nanoplasma ball,which can absorb the laser resonantly to further ionize the single charge ion to the high charge state.Up to Kr 17+ multicharged krypton ions have b ee n observed in time-of-flight mass spectrum by a 25 ns Nd-YAG 1.064 μm laser at laser intensity about 10 12 W/cm 2. Experimental results indicate that the multicharged ions appear only when the laser interacts with the middle part of the pulsed beam,and the intensities of the multicharged ions increase dramat ically by increasing the backing pressure of Kr gas, which indicates that the cl usters in the beam is essential to the production of multicharged ions. From the experimental results, it is concluded that the cluster is ionized via multiphot on ionization and forms a nanoplasma ball,which can absorb the laser resonantly to further ionize the single charge ion to the high charge state.

关 键 词：氪 纳秒激光 高价离子 飞行时间质谱 

分 类 号：O644[理学—物理化学]