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Theoretical Study of Photoionization Processes in Fe(C_5H_5)_2

机译:Fe(C_5H_5)_2中光电离过程的理论研究

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摘要

Density Functional calculations have been carried out to determine the photoionization cross section and the asymmetry parameter profiles of Fe(C_5H_5)_2, using an explicit treatment of the continuum wave function. A accurate numerical treatment is employed to ensure convergence of the calculated photoemission profiles without further potential approximation. All valence and carbon and metal core ionizations are inverstigated over a wide energy range. A very satisfactory agreement is obtained with the vast experimental data available for this molecule, indicating that the present LDA level of theory is generally adequate to interpret the complete photoemission spectra in organometallic compounds, with the only exception being autoionization resonances, allowing extraction of chemically relevant information from the spectra and resolution of uncertain assignments. The analysis of the calculated cross sections allows us to definitely uphold the experimental assignment of the first four outer valence ionizations and furthermore suggests that characteristic behaviors can be also recognized in the core metal cross section profiles.
机译:使用连续波函数的显式处理,已经进行了密度泛函计算以确定Fe(C_5H_5)_2的光电离截面和不对称参数分布。采用了精确的数值处理以确保所计算的光发射曲线的收敛,而无需进一步的电势近似。在很宽的能量范围内,所有化合价以及碳原子和金属核的电离都得到了反演。该分子的大量实验数据获得了非常令人满意的协议,表明当前的LDA理论水平通常足以解释有机金属化合物中的完整光发射光谱,唯一的例外是自电离共振,从而可以提取化学上相关的来自光谱和不确定分配的分辨率的信息。对计算出的横截面的分析使我们可以明确地坚持前四个外价电离的实验分配,并且进一步表明,特征行为也可以在核心金属横截面轮廓中识别出来。

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