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Observation of ultrafast chemical dynamics using femtosecond laser spectroscopy

使用飞秒激光光谱观察超快化学动力学

基本信息

批准号：
1942490
负责人：
金额：
--
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1942490
关键词：
Observation ultrafast chemical dynamics using

项目摘要

Many important photochemical reactions occur on timescales from femtosecond to picosecond, requiring the use of ultrafast laser spectroscopy methods to observe the chemical dynamics. This project will use femtosecond laser pulses to initiate and monitor processes of photochemical change, both in isolated gas-phase molecules and in solution, allowing the development of a precise understanding of how the molecular dynamics are modified by a surrounding solvent. The gas-phase experiments will use velocity map imaging and ultrafast Coulomb explosion methods to take snapshots of the evolving structures of photoexcited molecules, thereby tracking the deformations which occur as chemical bonds are broken in energized molecules. The solution phase studies will use transient absorption spectroscopy in the infra-red, visible and ultraviolet regions to observe the changes in electronic state which photoexcited molecules undergo, their interactions with the surrounding solvent, dissipation of excess energy to the solvent bath, and reactions with other solute molecules. The outcomes of these complementary studies will be time constants and rate coefficients for the steps in molecular isomerization, dissociation or relaxation following absorption of ultraviolet radiation.The experimental studies will make use of two EPSRC-supported experiments in the Bristol laboratory: a Coulomb explosion and velocity map imaging experiment funded by EP/L005913/1 and an ultrafast transient absorption spectroscopy experiment supported by EP/R012695/1.

许多重要的光化学反应发生在从飞秒到皮秒的时间尺度上，需要使用超快激光光谱方法来观察化学动力学。该项目将使用飞秒激光脉冲来启动和监测孤立气相分子和溶液中的光化学变化过程，从而精确了解分子动力学如何通过周围溶剂进行修改。气相实验将使用速度图成像和超快库仑爆炸方法来拍摄光激发分子演变结构的快照，从而跟踪在通电分子中化学键断裂时发生的变形。溶液相研究将使用红外线、可见光和紫外线区域的瞬态吸收光谱，观察光激发分子所经历的电子状态变化、它们与周围溶剂的相互作用、多余能量向溶剂浴的耗散以及与其他溶质分子的反应。这些补充研究的结果将是紫外线辐射吸收后分子异构化、解离或弛豫步骤的时间常数和速率系数。实验研究将利用布里斯托实验室的两个EPSRC支持的实验：由EP/L005913/资助的库仑爆炸和速度图成像实验1和由EP/R 012695/1支持的超快瞬态吸收光谱实验。