Strong Field Molecular Ionization With Shaped Ultrafast Laser Pulses

使用成形超快激光脉冲进行强场分子电离

• 批准号: 1505679
• 负责人: Thomas Weinacht
• 金额: $ 45万
• 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: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1505679&HistoricalAwards=false
• 关键词: Strong; Field; Molecular; Ionization; Shaped

This work will advance our understanding of how electrons move in molecules. The motion of electrons in atoms, molecules and solids takes place on attosecond (a billionth of a billionth of a second) timescales, and requires very short laser pulses to resolve. 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 electron dynamics during ionization, which is important for molecular imaging, chemical dynamics and the development of new high speed electronics. This project will make use of shaped few cycle laser pulses to study strong field ionization of small molecules. The investigators will make use of ultrafast optical pulse shaping of filament based sub 10 fs (3-4 optical cycles) laser pulses, as well as velocity map imaging in order to study the angle and momentum resolved photoelectron spectrum as a function of laser pulse shape. This will help develop our 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 similar molecules.

这项工作将促进我们对电子在分子中如何运动的理解。电子在原子、分子和固体中的运动发生在阿秒（十亿分之一秒的十亿分之一）的时间尺度上，需要非常短的激光脉冲来解决。 该项目的研究人员将使用强烈的超短激光脉冲来抑制分子，去除与分子结合的许多电子中的一个。 他们将利用一种称为速度图成像的技术，在电子离开分子时拍摄电子的照片。 这些照片可以用来了解电离过程中的电子动力学，这对分子成像，化学动力学和新的高速电子学的发展非常重要。 本计画将利用成形的少周期雷射脉冲来研究小分子的强场离化。 研究人员将利用基于灯丝的亚10 fs（3-4个光周期）激光脉冲的超快光脉冲整形以及速度图成像，以研究角度和动量分辨的光电子谱作为激光脉冲形状的函数。 这将有助于我们理解电子如何从多轨道中移除，以及电子相关和非玻恩奥本海默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态动力学的探针，研究类似分子家族的解离和内部转换。