Uncovering Non-Adiabatic Dynamics in Strong Field Molecular Ionization

揭示强场分子电离中的非绝热动力学

基本信息

批准号：
1806294
负责人：
Thomas Weinacht
金额：
$ 48万
依托单位：
SUNY at Stony Brook
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806294&HistoricalAwards=false
关键词：
Uncovering Non Adiabatic Dynamics Strong

项目摘要

This work will study how electrons and nuclei move inside of molecules. Observing such motion will advance physicists' understanding of many processes in nature such as vision, energy storage, energy conversion, and chemical transformation. It is also important for fundamental approaches to the development of new technologies such as solar cells, ultrafast molecular switches, and quantum computers. While lasers are natural tools for manipulating and measuring electrons in molecules, one requires very short laser pulses in order to manipulate electrons in real time. The investigators in this project will use intense ultrashort laser pulses in order to ionize molecules, removing one of the many electrons bound to the molecule. They will take pictures of the electrons as they come off the molecules, making use of a technique called velocity map imaging. These pictures can be used to understand the coupled dynamics of electrons and nuclei during ionization, which is important for understanding chemical dynamics and for developing high speed electronics. This project will make use of shaped few cycle laser pulses to study non-adiabatic and correlated strong field ionization of small molecules (~5-10 atoms). The investigators will control the shape of sub 10 fs (3-4 optical cycles) laser pulses, and make use of velocity map imaging in order to study the angle and momentum resolved photoelectron spectrum (in coincidence with fragment ions) as a function of laser pulse shape. This will help develop a deeper understanding of how electrons are removed from multiple orbitals, and the extent to which electron correlation and non-Born Oppenheimer dynamics play a role in the ionization dynamics. The investigators will also make use of strong field ionization as a probe of excited state dynamics, studying dissociation and internal conversion in families of homologous molecules in order to understand similarities and differences.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.

这项工作将研究电子和核如何移动分子的内部。观察这种运动将促进物理学家对自然界中许多过程的理解，例如视觉，能量存储，能量转换和化学转化。对于开发新技术（例如太阳能电池，超快分子开关和量子计算机）的基本方法也很重要。虽然激光是用于操纵和测量分子电子的天然工具，但需要非常短的激光脉冲才能实时操纵电子。该项目中的研究人员将使用强烈的超短激光脉冲来电离分子，从而消除与该分子结合的众多电子之一。他们将使用一种称为速度图成像的技术拍摄电子的照片。这些图片可用于理解电离过程中电子和核的耦合动力学，这对于理解化学动力学和开发高速电子非常重要。该项目将利用形状的几个循环激光脉冲来研究小分子的非绝热和相关的强场电离（〜5-10原子）。研究人员将控制10 fs（3-4个光学周期）激光脉冲的形状，并使用速度图成像，以研究角度和动量分辨的光电谱（与碎片离子的巧合）作为激光脉冲形状的函数。这将有助于对如何从多个轨道中去除电子以及电子相关性和非出生的Oppenheimer动力学在电离动力学中发挥作用的程度。研究人员还将利用强场电离作为激发状态动力学的探测，研究同源分子家族中的分离和内部转化，以了解相似性和差异。该奖项反映了NSF的法定任务，并被认为是通过使用该基金会的智力和更广泛影响的评估来评估CRITERIA CRITERIA通过评估来通过评估来获得支持的。