Experimental and quantum-chemical studies on the three-particle fragmentation of neutral triatomic hydrogen
Experimental and quantum-chemical studies on the three-particle fragmentation of neutral triatomic hydrogen
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中性三原子氢三粒子碎裂的实验和量子化学研究
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
M. Jungen
中科院分区：
文献类型：
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作者：
U. Galster;Frank Baumgartner;U. Müller;H. Helm;M. Jungen
将定义明确的H{sub3}里德堡态解离为三个基态氢原子，揭示了三个碎片质心运动的特征关联模式。我们给出了H{sub3}和D{sub3}的所有低里德堡态的动量关联图的广泛实验数据集。特别是，主量子数为n=2的态具有相互亲和力的规则出现的简单关联图案。能量较高的状态通常表现出更复杂的模式，每个状态都是独一无二的。对H{sub3}Rydberg态的绝热势能面进行了量子化学计算，阐明了这些差异的可能来源。我们讨论了导致观察到的连续关联的可能的解离机制和路径。
Dissociation of well-defined H{sub 3} Rydberg states into three ground state hydrogen atoms reveals characteristic correlation patterns in the center-of-mass motion of the three fragments. We present an extensive experimental dataset of momentum correlation maps for all lower Rydberg states of H{sub 3} and D{sub 3}. In particular the states with principal quantum number n=2 feature simple correlation patterns with regular occurence of mutual affinities. Energetically higher-lying states typically show more complex patterns which are unique for each state. Quantum-chemical calculations on adiabatic potential energy surfaces of H{sub 3} Rydberg states are presented to illuminate the likely origin of these differences. We discuss the likely dissociation mechanisms and paths which are responsible for the observed continuum correlation.