Coulomb explosion dynamics of N2 in intense laser field by mass-resolved momentum imaging
Coulomb explosion dynamics of N2 in intense laser field by mass-resolved momentum imaging
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DOI：
10.1016/s0301-0104(98)00025-1
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发表时间：
1998-06-01
期刊：
影响因子：
2.3
通讯作者：
Yamanouchi, K
中科院分区：
文献类型：
--
作者：
Hishikawa, A;Iwamae, A;Yamanouchi, K
用高分辨飞行时间质谱（TOF）和质量分辨二维动量成像（MRMI）方法研究了强激光（0.73- 6.9PW/cm ~ 2）照射下N-2，N-2（（p+q）+）--> Np+ + Nq+的库仑爆炸反应.除了（0，1），（0，2）解离途径外，还识别出了6条爆炸途径（p，q）=（1，1），（1，2），（1，3），（2，2），（2，3）和（3，3），根据碎片对之间的动量匹配和它们与激光场强度依赖性的相关性，对它们进行了可靠的指认。MRMI方法，它可视化的径向和角动量分布的质量选择的碎片离子在一个二维的动量平面上，被用来关联库仑爆炸后产生的离子碎片。通过研究理论合成的MRMI图，发现MRMI技术可以在很宽的动量范围内提取碎片离子的动量分布。通过对MRMI图的三维积分，评估了六种不同激光场强度下爆炸路径的相对产额，并推导出了在碎裂之前形成单电荷和多电荷母体N-2（（p+q）+）离子的强度依赖性。(C)1998 Elsevier Science B. V.保留所有权利。
The Coulomb explosion reactions of N-2, N-2((p+q)+) --> Np+ + Nq+ caused by the irradiation of intense laser light (0.73-6.9 PW/cm(2)) were investigated by high-resolution time-of-flight (TOF) mass spectroscopy and by the mass-resolved two-dimensional momentum imaging (MRMI) method. Six explosion pathways(p, q) = (1, 1), (1,2), (1,3), (2, 2), (2, 3) and (3, 3) in addition to (0, 1), (0,2) dissociation pathways were identified, whose assignments were securely performed both from the momentum matching between the fragment pair and their correlation with the laser-field intensity dependence. The MRMI method, which visualizes the radial and angular momentum distributions of mass-selected fragment ions on a two-dimensional momentum plane, was used to correlate ion fragments produced after the Coulomb explosion. By examining theoretically synthesized MRMI maps, it was found that the momentum distributions of the fragment ions in a wide momentum range can be extracted by the MRMI technique. The relative yields of the explosion pathways at six different laser-field intensities were evaluated from the three-dimensional integration of the MRMI maps, and the intensity dependence of the formation of singly and multiply charged parent N-2((p+q) +) ions prior to the fragmentation was derived. (C) 1998 Elsevier Science B.V. All rights reserved.