一、引言固体表面的原子排列结构和吸附物在表面上的吸附位置和分布,是了解有关多相催化作用的基础。低能电子衍射(Low Energy Electron Diffraction,简称LEED)是目前使用最多的测定固体表面结构的方法。电子衍射现象是本世纪20年代发...一、引言固体表面的原子排列结构和吸附物在表面上的吸附位置和分布,是了解有关多相催化作用的基础。低能电子衍射(Low Energy Electron Diffraction,简称LEED)是目前使用最多的测定固体表面结构的方法。电子衍射现象是本世纪20年代发现的。1924年de Broglie 提出了粒子具有波动性质的假设。展开更多
Influence of the interiayer interactions on aggregates in Y-type Langmuir-Blodgett multilayers was inveshgated by using steady-state and time-resolved fluorescence techniques. As the interiayer interactions was screen...Influence of the interiayer interactions on aggregates in Y-type Langmuir-Blodgett multilayers was inveshgated by using steady-state and time-resolved fluorescence techniques. As the interiayer interactions was screened by arachidic acid layers, intralayer interaction of hemicyanine molecules caused formation of H-aggregates and a blue shift of the fluorescence band in interleaving hemicyanine/arachidic acid multilayers. In pure Y-type hemicyanine multilayers, however, the molecules mainly formed J-aggregates leading to a significant red shift of fluorescence band and a larger scale of aggregates due to the stronger interlayer interactions.展开更多
文摘一、引言固体表面的原子排列结构和吸附物在表面上的吸附位置和分布,是了解有关多相催化作用的基础。低能电子衍射(Low Energy Electron Diffraction,简称LEED)是目前使用最多的测定固体表面结构的方法。电子衍射现象是本世纪20年代发现的。1924年de Broglie 提出了粒子具有波动性质的假设。
文摘Influence of the interiayer interactions on aggregates in Y-type Langmuir-Blodgett multilayers was inveshgated by using steady-state and time-resolved fluorescence techniques. As the interiayer interactions was screened by arachidic acid layers, intralayer interaction of hemicyanine molecules caused formation of H-aggregates and a blue shift of the fluorescence band in interleaving hemicyanine/arachidic acid multilayers. In pure Y-type hemicyanine multilayers, however, the molecules mainly formed J-aggregates leading to a significant red shift of fluorescence band and a larger scale of aggregates due to the stronger interlayer interactions.
