The role of initial and final states in molecular spectroscopies.

The role of initial and final states in molecular spectroscopies.
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初始态和最终态在分子光谱中的作用

DOI:
10.1039/c8cp07318j
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发表时间:
2019
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
T. Fritz
T. Fritz
中科院分区:
--
文献类型:
--
作者:
T. Kirchhuebel;O. L. A. Monti;T. Munakata;S. Kera;R. Forker;T. Fritz

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解释有机半导体薄膜的实验光谱是具有挑战性的,理解通过不同光谱技术获得的实验数据之间的关系需要仔细考虑每个过程的初始态和终态。光谱数据的讨论经常陷入混乱之中,这源于重叠的术语,而这些术语在不同的光谱中具有不同的含义。在这里,我们提出了一个连贯的框架,它能够平等地处理大多数通常用于研究有机半导体薄膜的光谱分析。我们开发了一个简单的模型来计算预期的能级位置,这是通过普通光谱技术获得的,并将它们与分子态的能量联系起来。考虑了光电离过程中的分子电荷能,以及环境极化引起的吸附能和分子电荷的屏蔽,作为测量光谱特征漂移的主要原因。我们解释了这些量之间的关系,以及与输运带隙、光学带隙和激子结合能的关系。我们的考虑可以作为弱相互作用系统的模型,例如各种有机分子晶体,其中相邻分子之间的波函数杂化可以忽略不计。
Interpreting experimental spectra of thin films of organic semiconductors is challenging, and understanding the relationship between experimental data obtained by different spectroscopic techniques requires a careful consideration of the initial and final states for each process. The discussion of spectroscopic data is frequently mired in confusion that originates in overlapping terminology with however distinct meaning in different spectroscopies. Here, we present a coherent framework that is capable of treating on equal footing most spectroscopies commonly used to investigate thin films of organic semiconductors. We develop a simple model for the expected energy level positions, as obtained by common spectroscopic techniques, and relate them to the energies of molecular states. Molecular charging energies in photoionization processes, as well as adsorption energies and the screening of molecular charges due to environmental polarization, are taken into account as the main causes for shifts of the measured spectroscopic features. We explain the relationship between these quantities, as well as with the transport gap, the optical gap and the exciton binding energy. Our considerations serve as a model for weakly interacting systems, e.g., various organic molecular crystals, where wave function hybridizations between adjacent molecules are negligible.
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影响因子: --
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影响因子: 3.7
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影响因子: 3.2
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影响因子: --
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