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AuCn-/0(n=3~8)的负离子光电能谱和密度泛函理论研究:电子结合能和几何结构的奇偶效应(英文)
Anion Photoelectron Spectroscopy and Density Functional Theory Studies of AuCn-/0(n=3-8):Odd-Even Alternation in Electron Binding Energies and Structures
【摘要】 本文测量子AuCn-(n=3~8)的光电子能谱,并且对AuCn-/0(n=3~8)的结构和性质进行了理论研究.研究发现,AuCn-的光电子能谱表现出明显的奇偶交替变化,AuC3-、AuC5-、AuC7-的光电子能谱峰明显宽于AuC4-、AuC6-、AuC8-的光电子能谱峰,AuC3-、AuC5-、AuC7-的电子垂直脱附能低于AuC4-、AuC6-、AuC8-的电子垂直脱附能.AuCn-(n=3~8)的最稳定结构是链状结构.在中性团簇AuCn(n=3~8)中,除了AuC3和AuC5的结构轻微弯曲外,其他团簇均是直线型结构.理论计算的∠AuCC角度,Au-C键长和Au原子的电荷分布均呈现奇偶变化,与实验观测一致.
【Abstract】 We measured the photoelectron spectra of AuCn-(n=3-8) and conducted theoretical study on the structures and properties of AuCn-/0(n=3-8).It is found that the photoelectron spectra of AuCn-exhibit odd-even alternation.The spectral features of AuC3-,AuC5-,and AuC7-are much broader than those of AuC4-, AuC6-,and AuC5-.The vertical detachment energies of AuC3-,AuC5-,and AuC7- are lower than those of AuC4-,AuC6-,and AuCs8-. The most stable structures of AuCn-(n=3-8) are chain structures.The most stable structures of neutral AuCn(n=3-8) are linear structures except that those of AuC3 and AuC5 are slightly bent.The calculated ∠AuCC angles,Au-C bond lengths,and the charges on Au atom also show odd-even alternations,consistent with the experimental observations.
【Key words】 Gold carbides; Photoelectron spectroscopy; Density functional theory; Odd-even alternation;
- 【文献出处】 Chinese Journal of Chemical Physics ,化学物理学报(英文版) , 编辑部邮箱 ,2022年01期
- 【分类号】O641.1
- 【下载频次】48