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MRI: Development of an Isolated Attosecond Pulse Spectrometer at the Carbon K Edge

MRI：碳 K 边缘隔离阿秒脉冲光谱仪的开发

基本信息

批准号：
1624322
负责人：
Stephen Leone
金额：
$ 98.75万
依托单位：
University of California-Berkeley
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-09-01 至 2019-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1624322&HistoricalAwards=false
关键词：
MRI Development Isolated Attosecond Pulse

项目摘要

With this award from the award from the Major Research Instrumentation (MRI) and the Chemistry Research Instrumentation (CRIF) Programs, Professor Stephen Leone from the University of California Berkeley and colleagues Daniel Neumark, Roger Falcone and Feng Wang have developed an attosecond spectrometer system to measure fast processes when electrons are excited in materials containing carbon. This is a benchtop laboratory system with a laser source generating pulses in an energy range called the carbon K-edge. When electrons are excited by this laser pulse, the dynamic process that result (molecular fragmentation, or rearrangement of other electrons) are observed. These processes can be very fast, on an attosecond time scale (10 to the minus 18 seconds). The processes are probed with such time-scale pulses of light as they occur. Initial experiments have demonstrated the operational proof-of-principle. Applications will proceed on various carbon-containing materials. In the long term, progress will allow new measurements and basic knowledge to be generated on electronic properties of materials, electronics and biological systems. In the process of building this system students interact with expert builders helping in the formation of the new generation of instrument builders. The award addresses the development of a laser system and apparatus that can produce high order harmonics and isolated attosecond pulses up to and through the carbon K edge (300 eV). A robust system is built that can perform dynamical attosecond experiments at the carbon K edge on a daily basis. The proposal is aimed at enhancing research and education at all levels, especially to (a) develop robust attosecond pulses, (b) study charge migration in molecules, (c) explore photodissociation dynamics and isomerization in prototype systems, (d) study electronic coherences and (e) analyze solid state and many-body charge state dynamics.

在重大研究仪器(MRI)和化学研究仪器(CRIF)项目颁发的这一奖项的帮助下，加州大学伯克利分校的Stephen Leone教授及其同事Daniel Neumark、Roger Falcon和冯旺开发了一种阿秒光谱仪系统，用于测量电子在含碳材料中被激发时的快速过程。这是一个台式实验室系统，有一个激光光源，在称为碳K边的能量范围内产生脉冲。当电子被这种激光脉冲激发时，可以观察到所产生的动态过程(分子碎裂或其他电子的重排)。这些过程可以非常快，以阿秒为时间尺度(10到负18秒)。当这些过程发生时，用这种时间尺度的光脉冲来探测它们。初步实验证明了该原理的可操作性。各种含碳材料的申请将继续进行。从长远来看，进步将使人们能够对材料、电子学和生物系统的电子性质进行新的测量和获得基本知识。在建立这个系统的过程中，学生们与专家建造者互动，帮助形成新一代仪器建造者。该奖项致力于开发一种激光系统和设备，该系统和设备可以产生高次谐波和孤立的阿秒脉冲，直到并通过碳K边缘(300 EV)。建立了一个健壮的系统，可以每天在碳K边上进行动态阿秒实验。该建议旨在加强各级的研究和教育，特别是(A)开发强大的阿秒脉冲，(B)研究分子中的电荷迁移，(C)探索原型系统中的光解动力学和异构化，(D)研究电子相干和(E)分析固态和多体电荷态动力学。