Excited-State Electron Transfer in Size-Selected Moleclar Cluster

1)在超音速自由射流中，分子可以处于冷却和孤立的分子状态，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的单重态激发态表现出激发态质子转移(ESPT)。本项目研究了3-羟基黄酮及其络合物及其溶剂团簇中的分子内ESPT在超音速膨胀中的纳秒荧光性质。2)喷射冷却双色电子供体-受体体系中分子内激基缔合物的形成有别于超音速膨胀时分子间激基缔合物的形成。目前的持续烧孔耗尽谱表明，这些双色性EDA体系以及分子间VDW络合物中都涉及到多构象。观察到不同的基态构象表现出不同的激基络合物形成对过量振动能量的依赖关系。

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.