| 乙腈团簇增强的激光高价电离现象的质谱研究 |
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| 引用本文： | 邵士勇,李海洋,罗晓琳,肖雪,牛冬梅,温丽华,王宾,梁峰,侯可勇.乙腈团簇增强的激光高价电离现象的质谱研究[J].物理化学学报,2005,21(10):1113-1116. |
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| 作者姓名： | 邵士勇 李海洋 罗晓琳 肖雪 牛冬梅 温丽华 王宾 梁峰 侯可勇 |
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| 作者单位： | Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031； Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 |
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| 基金项目： | 国家自然科学基金和国家863计划（2005AA649020）资助课题 |
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| 摘 要： | 利用脉宽为25 ns的脉冲Nd：YAG1064 nm激光, 在1010～1011 W•cm－２强度下, 用飞行时间质谱对乙腈分子束激光电离过程进行了研究, 发现了高价态的原子离子Nq+(q＝1～5)和Cq+(q＝1～4). 类氦离子N5+、C4+的最可几平动能分别高达566 eV和427 eV. 激光延时以及不同束源压力的实验结果表明, 这些高价离子可能来源于乙腈团簇的库仑爆炸过程. 提出一个多光子电离引发, 逆韧致吸收加热- 电子碰撞电离模型来解释高价离子的产生.
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| 关 键 词： | 乙腈 团簇 库仑爆炸 高价离子 |
| 收稿时间： | 2005-02-01 |
| 修稿时间： | 2005-04-29 |
Cluster-assistant Multiply Ionization of Acetonitrile by Nanosecond Laser |
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| SHAO,Shi-Yong,LI,Hai-Yang,LUO,Xiao-Lin,XIAO,Xue,NIU,Dong-Mei,WEN,Li-Hua,WANG,Bin,LIANG,Feng,HOU,Ke-Yong.Cluster-assistant Multiply Ionization of Acetonitrile by Nanosecond Laser[J].Acta Physico-Chimica Sinica,2005,21(10):1113-1116. |
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| Authors: | SHAO Shi-Yong LI Hai-Yang LUO Xiao-Lin XIAO Xue NIU Dong-Mei WEN Li-Hua WANG Bin LIANG Feng HOU Ke-Yong |
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| Institution: | Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031； Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 |
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| Abstract: | The photoionization of acetonitrile seeded in helium is studied by time- of- flight mass spectrometry using a 25 ns, 1064 nm Nd：YAG laser with intensity near 1011 W•cm－２. Multiply charged ions of Nq+(q=1～5) and Cq+(q=1～4) with hundreds of eV have been observed under laser beam irradiation with the densest portion of the pulsed molecular beam. An electron re-scattering and re-colliding ionization model is proposed to explain the generation of those multiply charged clusters under such low laser intensity. |
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| Keywords: | Acetonitrile Cluster Coulomb explosion Multiply charged ion |
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