Laser- and Detectionsystem for transient absorption spectroscopy with two excitation pulses

具有两个激发脉冲的瞬态吸收光谱激光和检测系统

• 批准号: 525172201
• 金额: --
• 依托单位: Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2023
• 资助国家: 德国
• 起止时间: 2022-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/525172201?language=en
• 关键词: Laser; Detectionsystem; transient; absorption; spectroscopy

The proposed spectrally tunable femtosecond laser system and detection system for time-resolved transient absorption spectroscopy with the optional use of a second excitation pulse will enable the time-resolved characterization with fs time resolution of ultrafast light-driven processes in photoactive systems. The proposed device will strengthen the strategic research field of the RPTU Kaiserslautern-Landau for investigating the interaction of light, spin and matter, specifically addressed in the profile area of the Research Initiative of the Federal State of Rhineland-Palatinate within the Center for Optics and Materials Sciences (OPTIMAS). One focus of the planned projects in the applicants working groups in the Department of Chemistry, in which the proposed device will be used, is the investigation of light-induced processes in materials for light-driven redox catalysis, e.g. the generation of hydrogen by reducing water. With the planned laser and detection system, the fundamental light-driven processes in colloidal semiconductor nanostructures, e.g. quantum dots and nanorods, such as exciton relaxation processes, charge carrier localization and recombination, and energy and charge carrier transfer between the components of hybrid materials based on these nanostructures will be investigated. The general goal of the work is to understand the basic mechanisms that lead to a desired function and to use the knowledge gained to improve the systems based on the derived structure-dynamics-function relationships. The option of using multiple excitation pulses will make it possible to study specific processes involving multiple charge carriers from a new perspective. The transfer of several charge carriers requires either a step-by-step consecutive charge transfer through successive excitation/charge transfer sequences or a simultaneous generation of several charge carriers and their quasi-simultaneous transfer to a suitable reaction center. These scenarios are to be investigated in photoactive hybrid materials based on colloidal semiconductor nanostructures with the proposed system. In addition, the laser system will enable the investigation of ultrafast molecular processes such as charge, energy, and spin transfer in functional transition metal compounds in both, the condensed phase by transient absorption spectroscopy and in the gas phase by observing fragmentation dynamics.

所提出的光谱可调谐飞秒激光系统和检测系统的时间分辨瞬态吸收光谱与可选使用的第二个激发脉冲将使时间分辨的表征与fs时间分辨率的超快光驱动过程中的光敏系统。拟议的设备将加强RPTU Kaiseraustern-Landau的战略研究领域，以调查光，自旋和物质的相互作用，特别是在莱茵兰-腭骨的联邦州研究计划的轮廓区域内，光学和材料科学中心（OPTIMAS）。申请人在化学系工作组中计划的项目的一个重点是研究用于光驱动氧化还原催化的材料中的光诱导过程，例如通过还原水产生氢气。利用计划的激光和检测系统，将研究胶体半导体纳米结构（例如量子点和纳米棒）中的基本光驱动过程，例如激子弛豫过程，电荷载流子局域化和复合，以及基于这些纳米结构的混合材料组分之间的能量和电荷载流子转移。这项工作的总体目标是了解导致所需功能的基本机制，并利用所获得的知识来改进基于衍生结构-动力学-功能关系的系统。使用多个激发脉冲的选择将使人们有可能从一个新的角度研究涉及多个电荷载流子的特定过程。几个电荷载流子的转移需要通过连续的激发/电荷转移序列逐步连续的电荷转移，或者同时产生几个电荷载流子并将其准同时转移到合适的反应中心。这些情况下进行调查，在光活性混合材料的基础上胶体半导体纳米结构与建议的系统。此外，该激光系统将使超快分子过程，如电荷，能量和自旋转移功能过渡金属化合物在这两个，凝聚相通过瞬态吸收光谱和在气相中通过观察碎裂动力学的调查。