Real-time observation of motion and shape of the wave-packet during ultrafast lattice relaxation

实时观察超快晶格弛豫过程中波包的运动和形状

• 批准号: 11440089
• 负责人: SUEMOTO Tohru
• 金额: $ 8.96万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440089/
• 关键词: femtosecond; halogen-bridged platinum-complex; wave-packet; luminescence; 格子緩和; 時間分解; 白金錯体; F中心; 自己束縛励起子; 波束運動

It is possible to observing infrared luminescence with a femtosecond time resolution, using up-conversion technique. The aim of this project is to observe time evolution of the wave-packet envelope in femtosecond time scale by improving the time resolution of the luminescence measurement. We investigated the generation and decay processes of the self-trapped excitons in the quasi-one-dimensional halogen-bridged platinum complexes by exciting the charge transfer absorption band. We observed characteristic oscillation in the time evolution of luminescence intensity at various energies. The time resolution before starting the project was improved to 50 fs, which is nearly the world best record and we were able to obtain very clear data. In the ordinary femotosecond measurements such as transient absorption, it is impossible to retrieve the time development of the wave-packet envelope, because the time response in a small range on the adiabatic potential is observed. However, the luminescence method allows us to get much more temporal information at many different points on the adiabatic potential surface. From the analysis of the experimental data based on a model calculation, we successfully retrieved the time dependent wave-packet envelope. The result shows that the spatial width of the wave-packet increases to 2.5 times of the initial value at 1/2 period and 3 times at one period of oscillation.

使用上转换技术，可以使用飞秒时间分辨率观察红外发光。该项目的目的是通过改善发光测量的时间分辨率来观察海浪包膜的时间演变。我们通过刺激电荷传递吸收带，研究了准中卤素桥的铂金配合物中自我捕获的激子的产生和衰减过程。我们观察到在各种能量下发光强度的时间演变中的特征振荡。启动项目之前的时间分辨率已提高到50 FS，这几乎是世界上最好的记录，我们能够获得非常清晰的数据。在普通的主流测量值（例如瞬时吸收）中，不可能检索波包包膜的时间发展，因为观察到在绝热电位上的较小范围内的时间响应。但是，发光方法使我们能够在绝热势表面的许多不同点获得更多的时间信息。根据基于模型计算的实验数据的分析，我们成功地检索了依赖时间的波包包膜。结果表明，波包的空间宽度在1/2周期的初始值的2.5倍，在振荡一个周期时增加了3倍。

项目成果

末元徹, 冨本慎一: "Femtosecond dynamics of self-trapped excitons in quasi-one-dimensional halogen-bridged Pt complexes"Journal of Luminescence. 83-84. 13-18 (1999)

Toru Suemoto、Shinichi Tomimoto：“准一维卤素桥接铂配合物中自俘获激子的飞秒动力学”发光杂志 83-84（1999）。

S. Tomimoto, S. Saito, T. Suemoto, K. Sakata, J. Takeda, and S. Kurita: "Observation of the wave-packet oscillation during the exciton self-trapping process in a quasi-one-dimensional halogen-bridged Pt complex"Phys. Rev.. B60. 7961-7965 (1999)

S. Tomimoto、S. Saito、T. Suemoto、K. Sakata、J. Takeda 和 S. Kurita：“准一维卤素桥激子自俘获过程中波包振荡的观察

冨本慎一 他5名: "Observation of the wave-packet oscillation during the exciton self-trapping process in a quasi-one-dimensional halogen-bridged Pt complex"Physical Review. B60. 7961-7965 (1999)

Shinichi Tomimoto 和其他 5 人：“准一维卤素桥接 Pt 络合物中激子自捕获过程中波包振荡的观察”物理评论 B60（1999）。

S. Tomimoto, S. Saito, T. Suemoto, J. Takeda and S. Kurita: "Femtosecond relaxation dynamics of excitons in 1D CDW systems"J. Luminescence. 94-95. 653-657 (2001)

S. Tomimoto、S. Saito、T. Suemoto、J. Takeda 和 S. Kurita：“一维 CDW 系统中激子的飞秒弛豫动力学”J。

Tohru Suemoto, Shinichi Tomimoto, Shingo Saito, Koji Sakata, Jun Takeda and Susumu Kurita: "Observation of the wave packet transit on the adiabatic potential surface of self-trapped excitons in halogen-bridged Pt complexes"J. Luminescence. 87-89. 844-846

Tohru Suemoto、Shinichi Tomimoto、Shingo Saito、Koji Sakata、Jun Takeda 和 Susumu Kurita：“卤素桥接 Pt 配合物中自俘获激子绝热势面上波包渡越的观察”J。