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国家自然科学基金(10874234)

作品数:5 被引量:4H指数:1
相关作者:丁勇王相思马凤才刘莎莎赵俊凤更多>>
相关机构:北京大学大连理工大学辽宁大学更多>>
发文基金:国家自然科学基金秦皇岛市科学技术研究与发展计划课题教育部科学技术研究重点项目更多>>
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Transition Dipole, Charge Transfer, and Electron-hole Coherence in Two-photon Absorption: Visualizations with Two Dimensional Site and Three Dimensional Cube Representations
2009年
The developed visualization methods of two dimensional (2D) site and three dimensional (3D) cube representations have been performed to show the orientation of transition dipole, charge transfer, and electron-hole coherence in two-photon absorption (TPA). The 3D cube representations of transition density can reveal visually the orientation and strength of transition dipole moment, and charge different density show the orientation of charge transfer in TPA. The 2D site representation can reveal visually the electron-hole coherence in TPA. The combination of 2D site and 3D cube representations provide clearly inspect into the charge transfer process and the contribution of excited molecular segments for TPA.
Yuan-zuo LiWen-qin ZhangXiao-hong ZhaoFeng-cai MaMao-du Chen
蒽醌分子的深紫外针尖增强拉曼散射的化学增强机制
2012年
利用含时密度泛函理论来研究深紫外针尖增强拉曼散射光谱的化学增强机制的报道,引发了许多关于紫外针尖增强拉曼散射的实验研究。本文通过含时密度泛函理论来计算铝3-蒽醌分子-铝3结在262 nm光能量激发下的拉曼光谱,结果表明该分子的拉曼光谱是针尖增强共振拉曼散射光谱,其化学增强因子为107。这表明在生物和材料领域,针尖增强共振拉曼散射技术可用于深紫外区域的指纹振荡光谱研究。
侯岩雪井西利王明利李源作
关键词:深紫外含时密度泛函理论
Visualization of Metal-to-Ligand and Ligand-to-Ligand Charge Transfer in MetaloLigand Complexes
2009年
Three methods including the atomic resolved density of state, charge difference density, and the transition density matrix are used to visualize metal to ligand charge transfer (MLCT) in ruthenium(II) ammine complex. The atomic resolved density of state shows that there is density of Ru on the HOMOs. All the density is localized on the ammine, which reveals that the excited electrons in the Ru complex are delocalized over the ammine ligand. The charge difference density shows that all the holes are localized on the Ru and the electrons on the ammine. The localization explains the MLCT on excitation. The transition density matrix shows that there is electron-hole coherence between Ru and ammine. These methods are also used to examine the MLCT in Os(bpy)2(p0p)Cl ("Osp0p": bpy=2,2-bipyrldyl; p0p=4,4'- bipyridyl) and the ligand-to-ligand charge transfer (LLCT) in Alq3. The calculated results show that these methods are powerful to examine MLCT and LLCT in the metal-ligand system.
丁勇郭建秀王相思刘莎莎马凤才
关键词:VISUALIZATION
Electrical and Raman properties of p-type and n-type modified graphene by inorganic quantum dot and organic molecule modification被引量:4
2011年
We obtained n-type and p-type modified graphene by mixing quantum dots and depositing electron-acceptor molecules on the surface of graphene, respectively. The electrical and optical properties of these two types of samples were measured. For n-type modified graphene, the electrons were transferred from quantum dots to graphene. The resistance of these quantum dots in modified n-type graphene is significantly smaller than that of pristine graphene. For p-type graphene, modified by electron-acceptor organic molecules of tetracyanoethylene (TCNE), electrons were transferred from graphene to TCNE molecules. The resistance of this molecular modified p-type graphene is about 10% larger than that of pristine graphene. The charge transfer effect on the optical properties of graphene was investigated with Raman spectra.
HOU YanXueGENG XiuMeiLI YuanZuoDONG BinLIU LiWeiSUN MengTao
Optical Properties of Neutral and Charged Low Band Gap Alternating Copolyfluorenes: TD-DFT Investigation
2009年
Electronic structure and optical properties of neutral and charged low band gap alternating copolyfluorenes (Green 1, which is based on alternating repeating units consisting of alkyl-substituted fluorene and a thiophene-[1,2,5]thiadiazolo-[3,4]quinoxaline-thiophene (T-TDQ-T) unit were investigated theoretically with time-dependent density functional theory (TD-DFT) method, and their excited state properties were further analyzed with 2D site and 3D cube representations. For neutral Green 1, the band gap, binding energy, exciton binding energy, and nuclear relaxation energy were obtained. The transition dipole moments of neutral and charged Green 1 are compared using 3D transition density, which reveals the orientation and strength of transition dipole moments. The charge redistribution of neutral and charged Green 1 upon excitation are displayed and compared with 3D charge difference density. The electron-hole coherences of neutral and charged Green 1 upon excitation are investigated with 2D site representation (transition density matrix). The excited state properties of neutral Green 1 calculated with TD-DFT method are compared with that calculated with ZINDO method, which reveals the importance of electron-electron interaction (in TD-DFT) in the excited state properties.
丁勇赵俊凤王相思刘莎莎马凤才
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