Excited-State Electron Transfer in Size-Selected Moleclar Cluster

1)在超声速自由射流中，分子可以处于冷却和孤立的分子状态，可以表现出不同于溶液中分子的固有特性。一些分子内氢键体系在分子单线态激发态下表现出激发态质子转移（ESPT）。本项目采用纳秒荧光技术研究了3-羟基黄酮及其相关化合物及其溶剂团簇在超声膨胀下的分子内ESPT。2)射流冷却双色团电子供体-受体体系的分子内异构体形成与超音速膨胀中的分子间异构体形成是有区别的。目前的持续孔燃烧耗尽光谱表明，这些双色性EDA体系和分子间的vdW复合物都涉及多种构象。观察到不同的基态构象表现出不同的激络合物形成的多余振动能量依赖。

1)In supersonic free jet, molecules can be in cooled and isolated molecular condition, which can exhibit inherent characters of molecules different from those in solution. Some intramolecular hydrogen bonding systems show the excited state proton transfer (ESPT) in the singlet excited state of molecule. This projet presents nanosecond fluorescence studies of the intramoecular ESPT in 3-hydroxyflavone and related complounds and in their solvent clusters in supersonic expansion.2)Intramolecular exciplex formation in the jet-cooled bichromophoric electron donor-acceptor systems is distinguishable from the intermolecular exciplex in supersonic expansion. The present persistent hole burning depletion spectra have demonstrated that the multi-conformations are involved in these bichromophoric EDA systems as well as intermolecular vdW complex. The different ground-state conformations were observed to exhibit the different excess vibrational energy dependence of the exciplex formation.