| Covariance analysis of the Coulomb explosion of ammonia induced by intense nanosecond laser at 532 nm |
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| 作者姓名： | NIU Dongmei LI Haiyang LIANG Feng WEN Lihua LUO Xiaolin |
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| 作者单位： | [1]Key Laboratory of Environmental Optics ＆ Technology,Anhui Institute of Optics and Fine Mechanics, Hefei 230031, China [2]Dalian Institute of Chemical Physics,Dalian 116023,China |
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| 基金项目： | Acknowledgements We thank engineer Zhang Wei lbr his help. This work was partFy supported by the Hi-Tech Research and DeveFopment Program of China （Grant No. 2005AA649010） and the Center for Comutational Science, Hefei Institutes of Physical Sciences. |
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| 摘 要： | The Coulomb explosion of ammonia clusters induced by nanosecond laser at 532 nm with an intensity of ～1012 Wcm^-2 has been studied by time of flight mass spectrometry. The dominant multiply charged ions are N^3＋ and N^2＋ with kinetic energies of 110 and 50 eV respectively. The electrons generated from the multiphoton ionization are heated through inverse bremsstrablung by tbe laser field when colliding with neutral or ionic particles. When their energies surpass the corresponding ionization potentials of the molecules or ions, the subsequent electron impact ionization may take place thus resulting in multi-charged nitrogen ions. Covariance analysis is made to study the possible pathways of the Coulomb explosion.
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| 关 键 词： | 协方差分析 激光电离 氨水 氮离子 相关性系数 |
| 收稿时间： | 2005-06-08 |
| 修稿时间： | 2005-06-082005-07-13 |
Covariance analysis of the Coulomb explosion of ammonia induced by intense nanosecond laser at 532 nm |
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| NIU Dongmei LI Haiyang LIANG Feng WEN Lihua LUO Xiaolin.Covariance analysis of the Coulomb explosion of ammonia induced by intense nanosecond laser at 532 nm[J].Chinese Science Bulletin,2005,50(18):2115-2117. |
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| Authors: | Dongmei Niu Haiyang Li Feng Liang Lihua Wen Xiaolin Luo |
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| Institution: | NIU Dongmei1, LI Haiyang1,2, LIANG Feng1, WEN Lihua1& LUO Xiaolin1 1. Key Laboratory of Environmental Optics & Technology,Anhui Institute of Optics and Fine Mechanics, Hefei 230031, China; 2. Dalian Institute of Chemical Physics, Dalian 116023, China |
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| Abstract: | The Coulomb explosion of ammonia clusters induced by nanosecond laser at 532 nm with an intensity of ~1012 Wcm-2 has been studied by time of flight mass spec-trometry. The dominant multiply charged ions are N3+ and N2+ with kinetic energies of 110 and 50 eV respectively. The electrons generated from the multiphoton ionization are heated through inverse bremsstrahlung by the laser field when colliding with neutral or ionic particles. When their energies surpass the corresponding ionization potentials of the molecules or ions, the subsequent electron impact ioniza-tion may take place thus resulting in multi-charged nitrogen ions. Covariance analysis is made to study the possible pathways of the Coulomb explosion. |
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| Keywords: | laser ionization ammonia multi-charged nitrogen ions Coulomb explosion correlation coefficient time of flight mass spectrometry |
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