| 纳秒激光电离产生Kr17+的研究 |
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| 作者单位： | 中国科学院安徽光学精密机械研究所,合肥,230031;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 |
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| 基金项目： | 国家自然科学基金;国家高技术研究发展计划（863计划） |
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| 摘 要： |
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| 关 键 词： | 氪 纳秒激光 高价离子 飞行时间质谱 |
Generation of Multicharged Krypton Ions in Nanosecond Laser Ionization of Krypton Beam |
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| Authors: | Luo Xiaolin Kong Xianglei Niu Dongmei Qu Hongbo Li Haiyang |
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| Abstract: | Up to Kr17 + multicharged krypton ions have been observed in time-of-flight mass spectrum by a 25 ns Nd-YAG 1. 064 μm laser at laser intensity about 1012 W/ cm2 . 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 dramatically by increasing the backing pressure of Kr gas，which indicates that the clusters in the beam is essential to the production of multicharged ions. From the experimental results，it is concluded that the cluster is ionized via multiphoton ionization and forms a nanoplasma ball，which can absorb the laser resonantly to further ionize the single charge ion to the high charge state. |
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| Keywords: | Krypton，Nanosecond laser，Multicharged ions，Time-of-flight mass spectrum |
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