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

该奖项由主要研究仪器（MRI）和化学研究仪器（CRIF）项目颁发，来自加州大学伯克利分校的Stephen Leone教授及其同事Daniel Neumark， Roger Falcone和Feng Wang开发了一种阿秒光谱仪系统，用于测量含碳材料中电子被激发时的快速过程。这是一个台式实验室系统，其激光源产生的脉冲能量范围称为碳k边。当电子被激光脉冲激发时，所产生的动态过程（分子分裂或其他电子的重新排列）被观察到。这些过程可以非常快，在阿秒的时间尺度上（10的负18次方秒）。当这些过程发生时，用这种时间尺度的光脉冲来探测它们。初步实验证明了操作原理。各种含碳材料的申请将继续进行。从长远来看，进展将允许在材料、电子和生物系统的电子特性方面产生新的测量和基本知识。在这个系统的构建过程中，学生与专家的互动有助于新一代乐器制造者的形成。该奖项旨在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隔离阿秒脉冲，直至碳K边缘（300 eV）。建立了一个鲁棒系统，可以在碳K边缘每天进行动态阿秒实验。该提案旨在加强各级的研究和教育，特别是(a)开发鲁棒阿秒脉冲，(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。

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.