物理化学学报 >> 2004, Vol. 20 >> Issue (03): 225-227.doi: 10.3866/PKU.WHXB20040301

通讯    下一篇

532 nm纳秒激光电离产生Xez＋(z ≤ 11)高价离子

罗晓琳;孔祥蕾;牛冬梅;渠洪波;李海洋   

  1. 中国科学院安徽光学精密机械研究所,合肥　230031;中国科学院大连化学物理研究所,大连　116023
  • 收稿日期:2003-11-24 修回日期:2003-12-22 发布日期:2004-03-15
  • 通讯作者: 李海洋 E-mail:hli@aiofu.ac.cn

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

Luo Xiao-Lin;Kong Xiang-Lei;Niu Dong-Mei;Qu Hong-Bo;Li Hai-Yang   

  1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei　230031;Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian　116023
  • Received:2003-11-24 Revised:2003-12-22 Published:2004-03-15
  • Contact: Li Hai-Yang E-mail:hli@aiofu.ac.cn

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摘要： 利用25 ns脉冲Nd-YAG 532 nm激光,在1011 W•cm－2的光场强度下,研究了Xe原子团簇的激光电离过程,观察到较强的高价离子信号,其中最高价态达＋11.不同脉冲束位置和束源压力的实验表明,仅当激光作用于脉冲束中段时才能观察到高价离子,且高价离子信号强度随束源压力的增加而迅速增强,说明束中大尺寸团簇的存在与高价离子的形成密切相关.通过实验,认为高价离子可能来源于电离原子团簇而形成的纳米尺度等离子体小球对激光光场的共振吸收.

关键词: 氙, 纳秒激光, 高价离子, 飞行时间质谱

Abstract: Multicharged xenon ions with charge upto 11 have been observed in laser ionization of xenon beam by a 25 ns Nd-YAG 532 nm laser at laser intensity about 1011 W•cm－2.Experiment results indicated that the multicharged ions appeared only when the laser interacted with the middle part of the pulsed beam, and its intensities increase with increase the backing pressure of Xe source gas, indicates that the clusters in the beam is essential to the production of multicharged ions. From the experimental results, we think that the cluster is ionized via multiphoton ionization and form a nanoplasma ball, which can absorb the laser resonantly to further ionize the single charge ion to high charge state.

Key words: Xenon, Nanosecond laser, Multicharged ions, Time-of-flight mass spectrometry