Visualizing Photon Induced Dynamics in Polyatomic Molecules using Femtosecond Pump-Probe Laser Pulses
使用飞秒泵浦探测激光脉冲可视化多原子分子中的光子诱发动力学
基本信息
- 批准号:2006269
- 负责人:
- 金额:$ 52.73万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2020
- 资助国家:美国
- 起止时间:2020-08-01 至 2023-10-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
General audience abstract: This project will investigate how light affects and transforms molecules encountered in nature and in living systems. For example, after shining light on molecules they may transform through a phenomenon called isomerization. The first step in human vision is such a transformation. Another light-triggered phenomenon is the ability for hydrogen atoms, in some molecules, to move from one end of a molecule to another. This transformation is crucial for biological photo-protection mechanisms in DNA and melanin. Students will use the ultrafast and ultra-intense table-top lasers in the PI’s lab to conduct experiments on such light-induced changes in molecules. They will also study the light-triggered opening of some ringed shaped molecules, as for example occurs in vitamin D synthesis in the skin. These types of molecules are being explored for optoelectronic applications in optical switching and nano-mechanical motors. Furthermore, the investigation of the breakup of molecules, with many hydrogen atoms, after they absorb light, is of extreme importance in environmental protection. This research program provides a comprehensive hands-on education and training opportunity for undergraduates, graduate students, and postdocs, who are the next generation workforce in STEM fields in academia and are essential in various industries. The team will collaborate with many theorists, allowing the development of computational methods for understanding the phenomena being explored in the lab. The PI is very active in outreach activities to the wider community. She will continue to invite local teachers with their middle school and high school students to day camps, giving many students from groups currently underrepresented in science an early exposure to STEM fields.Technical audience abstract:The goal of the research program is to study, time-resolved, table-top laser-induced femtosecond dynamics in polyatomic molecules in order to better understand non-adiabatic molecular dynamics. Specifically, the PI and her students wish to elucidate how electronic rearrangement in molecules, subsequent to optical field absorption, at different laser pulse energies and femtosecond pulse duration induces and affects nuclear motion. The latter leads to atomic rearrangement, bond elongation, isomerization, ring opening, bond breaking, bond making, and molecular fragmentation. Time-resolved non-adiabatic dynamics have been difficult to observe directly because techniques are often not sufficiently differential to provide detailed information. Building on their current work, the team aims to measure infrared- or ultraviolet-induced multi-hydrogen migration, an isomerization process involving migration of two or more hydrogen atoms in molecules. The team will also investigate ring opening reaction experiments in molecules, for which the deactivation mechanism of the photo-excited molecules along the reaction path crosses conical intersections, which they plan to characterize. The experiments will be carried out using laser pump-probe technique,s and the resulting charged fragments will be detected using a coincidence experimental system, the Cold-Target Recoil Ion Momentum Spectroscopy (COLTRIMS). The underlying dynamics will be revealed by coincident ion-momentum imaging. This work is in the regime where the Born-Oppenheimer approximation breaks down, which needs thorough investigation and understanding.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
一般观众摘要:这个项目将研究光如何影响和转化自然界和生命系统中遇到的分子。例如,在对分子照射光之后,它们可能通过一种称为异构化的现象进行转化。 人类视觉的第一步就是这样的转变。 另一个光引发的现象是氢原子的能力,在一些分子中,从分子的一端移动到另一端。这种转化对于DNA和黑色素中的生物光保护机制至关重要。学生们将在PI实验室使用超快和超强的台式激光器来进行这种光诱导分子变化的实验。他们还将研究一些环状分子的光触发开放,例如在皮肤中合成维生素D时发生的。这些类型的分子正在探索用于光开关和纳米机械马达中的光电应用。此外,研究具有许多氢原子的分子在吸收光后的分裂在环境保护中具有极端重要性。该研究计划为本科生,研究生和博士后提供了全面的实践教育和培训机会,他们是学术界STEM领域的下一代劳动力,在各个行业中至关重要。该团队将与许多理论家合作,开发计算方法来理解实验室中正在探索的现象。 PI非常积极地向更广泛的社区开展外联活动。 她将继续邀请当地教师和他们的初中和高中学生参加日营,让许多来自目前在科学领域代表性不足的群体的学生尽早接触STEM领域。技术观众摘要:该研究计划的目标是研究多原子分子中的时间分辨、桌面激光诱导的飞秒动力学,以便更好地理解非绝热分子动力学。具体来说,PI和她的学生希望阐明如何在分子中的电子重排,光场吸收后,在不同的激光脉冲能量和飞秒脉冲持续时间诱导和影响核运动。后者导致原子重排、键伸长、异构化、开环、键断裂、键形成和分子断裂。时间分辨的非绝热动力学一直难以直接观察,因为技术往往没有足够的差异,以提供详细的信息。在他们目前工作的基础上,该团队的目标是测量红外线或紫外线诱导的多氢迁移,这是一种涉及分子中两个或多个氢原子迁移的异构化过程。该团队还将研究分子中的开环反应实验,其中光激发分子的失活机制沿着反应路径穿过圆锥形交叉点,他们计划对其进行表征。实验将使用激光泵浦-探测技术进行,并将使用符合实验系统,冷靶反冲离子动量光谱(COLTRIMS)检测所产生的带电碎片。基本的动力学将通过同步离子动量成像来揭示。该奖项反映了NSF的法定使命,通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Ultrafast molecular dynamics in ionized 1- and 2-propanol: from simple fragmentation to complex isomerization and roaming mechanisms
电离 1- 和 2- 丙醇中的超快分子动力学:从简单的裂解到复杂的异构化和漫游机制
- DOI:10.1039/d1cp04011a
- 发表时间:2021
- 期刊:
- 影响因子:3.3
- 作者:Mishra, Debadarshini;Reino-González, Juan;Obaid, Razib;LaForge, Aaron C.;Díaz-Tendero, Sergio;Martín, Fernando;Berrah, Nora
- 通讯作者:Berrah, Nora
Ultrafast Laser-Induced Isomerization Dynamics in Acetonitrile
- DOI:10.1021/acs.jpclett.0c01344
- 发表时间:2020-08-20
- 期刊:
- 影响因子:5.7
- 作者:McDonnell, Matteo;LaForge, Aaron C.;Berrah, Nora
- 通讯作者:Berrah, Nora
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Nora Berrah其他文献
High-power femtosecond molecular broadening and the effects of ro-vibrational coupling
高功率飞秒分子展宽和振动耦合效应
- DOI:
- 发表时间:
2024 - 期刊:
- 影响因子:0
- 作者:
Kevin Watson;Tobias Saule;Maksym Ivanov;Bruno E. Schmidt;Zhanna Rodnova;George Gibson;Nora Berrah;C. Trallero - 通讯作者:
C. Trallero
Challenges and opportunities in attosecond and XFEL science
阿秒和 XFEL 科学中的挑战与机遇
- DOI:
10.1038/s42254-019-0023-9 - 发表时间:
2019-01-29 - 期刊:
- 影响因子:39.500
- 作者:
Eva Lindroth;Francesca Calegari;Linda Young;Marion Harmand;Nirit Dudovich;Nora Berrah;Olga Smirnova - 通讯作者:
Olga Smirnova
Nora Berrah的其他文献
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{{ truncateString('Nora Berrah', 18)}}的其他基金
Visualizing Photon Induced Dynamics in Polyatomic Molecules using Femtosecond Pump-Probe Laser Pulses
使用飞秒泵浦探测激光脉冲可视化多原子分子中的光子诱发动力学
- 批准号:
2306982 - 财政年份:2023
- 资助金额:
$ 52.73万 - 项目类别:
Continuing Grant
Visualizing Molecular Dynamics in Large Molecules using Intense, femtosecond, Pump-Probe Laser Pulses
使用强飞秒泵浦探测激光脉冲可视化大分子中的分子动力学
- 批准号:
1700551 - 财政年份:2017
- 资助金额:
$ 52.73万 - 项目类别:
Continuing Grant
U.S.-France Cooperative Research: Probing Dynamics in Open Shell Atoms and Molecules using Two Photons Experiments
美法合作研究:利用两个光子实验探测开壳原子和分子的动力学
- 批准号:
0440633 - 财政年份:2005
- 资助金额:
$ 52.73万 - 项目类别:
Standard Grant
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