Probing intramolecular dynamical processes in electronically excited states of small aromatic molecules

探测芳香族小分子电子激发态的分子内动力学过程

• 批准号: EP/E046150/1
• 负责人: Katharine Reid
• 金额: $ 107.05万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE046150%2F1
• 关键词: Probing; intramolecular; dynamical; processes; electronically

A molecule can be considered as a collection of balls and springs. If a spring in one part of a molecule is tweaked, the energy can be transferred to other parts of the molecules. Chemists are interested in the mechanism and the timescale of this transfer process because it dictates the kinds of reactions that the molecule can undergo. In the experiments proposed here, the tweak will come from a very short laser pulse that has a well-defined energy. This energy will be matched to a resonance in the molecule. The transfer of the energy around the molecule will be monitored by a second laser pulse which will be delayed with respect to the first so that it arrives at a well-defined time, less than one ten billionth of a second later. The second laser pulse will cause the ejection of an electron from the molecule whose behaviour as a function of the controlled time delay will enable us to watch the energy moving around the molecular framework. We have chosen a set of molecules for study which are all based on a ring structure, with various related groups of atoms attached to the rings. This will enable us to examine in a systematic way the effect of changing the molecular structure. Thus, we hope to find common threads that will enable us to understand energy transfer processes in molecules.

分子可以被视为球和弹簧的集合。如果调整分子某一部分的弹簧，能量就可以转移到分子的其他部分。化学家对这种转移过程的机制和时间尺度很感兴趣，因为它决定了分子可以经历的反应类型。在这里提出的实验中，调整将来自具有明确能量的非常短的激光脉冲。该能量将与分子中的共振相匹配。分子周围的能量转移将由第二个激光脉冲监测，该脉冲将相对于第一个激光脉冲延迟，以便它在明确的时间到达，晚于不到十亿分之一秒。第二个激光脉冲将导致电子从分子中喷射出来，其行为作为受控时间延迟的函数将使我们能够观察分子框架周围的能量移动。我们选择了一组分子进行研究，它们都基于环结构，环上附着有各种相关的原子基团。这将使我们能够系统地检查改变分子结构的影响。因此，我们希望找到共同的线索，使我们能够理解分子中的能量转移过程。

项目成果

Probing the origins of vibrational mode specificity in intramolecular dynamics through picosecond time-resolved photoelectron imaging studies.

通过皮秒时间分辨光电子成像研究探讨分子内动力学振动模式特异性的起源。

• DOI: 10.1039/c6cp08132k
• 发表时间: 2017
• 期刊: PCCP
• 作者: Davies JA

Comment on "Photoelectron angular distributions as a probe of alignment in a polyatomic molecule: picosecond time- and angle-resolved photoelectron spectroscopy of S1 p-difluorobenzene" [J. Chem. Phys. 111, 1438 (1999)].

对“光电子角分布作为多原子分子排列探针：S1 对二氟苯的皮秒时间和角度分辨光电子能谱”的评论 [J.

• DOI: 10.1063/1.4821765
• 发表时间: 2013
• 期刊: The Journal of chemical physics
• 作者: Midgley J