Bi-electronic excitation as a possible source for excited state absorptions in molecular systems

拟议的研究项目的核心部分是阐明出现在吸收光谱的最长波长带的光谱区域中的单体分子系统的S1->Sx激发态跃迁（ESA）的物理性质。该项目的目标将是确定在单重态系统中，两个价电子中是否只有一个离开其基态轨道，或者两个电子都离开。尽管这个问题的基本重要性，据我所知，既没有一个理论上的，也没有一个实验上的答案，然而，确切了解分子的激发态散射是越来越需要的，因为它们经常干扰光学系统的应用。另外，激发态激发也可以开辟新的应用领域。为了详细阐明上述激发态激发的物理背景，所要求的项目涉及具有两个价电子的单体分子系统（单重态系统）的定量分析。调查将通过与只有一个价电子的分子系统（双重，三重态系统）进行比较来补充。

Central part of the proposed research project is the elucidation of the physical nature of S1->Sx excited state absorptions (ESA) of monomer molecular systems which appear in the spectral region of the most long wavelength band of the absorption spectrum. Goal of the project will be to decide if in singlet systems only one of the two valence electrons leaves its ground state orbital or both electrons do. Despite the fundamental importance of this problem to my knowledge there is neither a theoretical nor an experimental answer, yet.The exact acquaintance of excited state absorptions of molecules is increasingly desirable because they often disturb applications in optical systems. Otherwise, excited state absorptions can also open new fields of application.To clarify the above mentioned physical background of these excited state absorptions in detail the requested project deals with a quantitative analysis of monomeric molecular systems with two valence electrons (singlet systems). The investigations will be supplemented by comparing them with molecular systems having only one valence electron (doublet, triplet systems).