CAREER: Investigation of Attosecond and Femtosecond Dynamics in Atoms and Molecules using XUV+IR Spectroscopy

职业：使用 XUV 红外光谱研究原子和分子的阿秒和飞秒动力学

• 批准号: 0955274
• 负责人: Arvinder Sandhu
• 金额: $ 53.63万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0955274&HistoricalAwards=false
• 关键词: CAREER; Investigation; Attosecond; Femtosecond; Dynamics

This award will allow for the establishment of a strong research and educational development program in the field of ultrafast atomic, molecular, and optical sciences in the Department of Physics at the University of Arizona. The program will study atomic and molecular response to strong transient electric fields with simultaneous use of IR and XUV pulses in attosecond precision experiments. This will involve measurement and control of electronic and nuclear dynamics in highly-excited molecules using attosecond/femtosecond resolved pump-probe experiments. Ultrashort XUV excitation provides direct access to an interesting and challenging regime, where atoms and molecules are energetically far from their ground-state configuration. Using attosecond time-resolved XUV+IR experiments, we can measure the effect of strong electric fields on excited bound-state wavepackets in atomic systems. These measurements will offer new opportunities for the control of electron dynamics on attosecond time-scales. In molecules, the XUV excitation is associated with fast inner-valence electron phenomenon, correlated two-electron processes, and strongly interdependent electronic and nuclear dynamics. The understanding of time-resolved dynamics in this regime has been very limited due to the spectroscopic difficulties in probing inherently low cross-section photo-fragmentation channels; the complexity of the potential energy surface manifold in highly-excited systems; and the paucity of efficient, tunable, femtosecond/attosecond XUV photon sources. This project aims at investigating this regime by utilizing cutting-edge research tools, such as, tailored XUV pulses, and efficient photo-fragment imaging schemes.The broader aspects include the CAREER educational objectives that will increase the representation of Hispanic students in physics research; directly involve undergraduate students in ultrafast science research; and lead to the development and web-based dissemination of interactive learning programs. This training and outreach, along with the forefront research will help make our nation more competitive in the field of attosecond and femtosecond science. The educational plan targets students from an under-represented group. In collaboration with a primarily Hispanic institution (UTEP), Hispanic students will obtain hands-on experience and vital exposure in a cutting edge field of research. With the involvement of graduate and undergraduate students, the educational program leads to the development of interactive learning programs in optics/AMO, along with a method for web-based publication and dissemination, in a manner that will be useful to wider community. The research spin-offs of this program will be in the form of new insights and discoveries, which will impact other related fields such as quantum optics, theoretical atomic and molecular physics, coherent control, atmospheric chemistry, chemical imaging and radiation chemistry.

该奖项将有助于亚利桑那大学物理系在超快原子、分子和光学科学领域建立强大的研究和教育发展项目。该项目将在阿秒精度实验中同时使用红外和极紫外脉冲，研究原子和分子对强瞬态电场的响应。这将涉及使用阿秒/飞秒分辨泵浦探针实验来测量和控制高激发分子中的电子和核动力学。超短 XUV 激发可以直接进入有趣且具有挑战性的区域，其中原子和分子在能量上远离其基态配置。利用阿秒时间分辨 XUV+IR 实验，我们可以测量强电场对原子系统中激发束缚态波包的影响。这些测量将为阿秒时间尺度上的电子动力学控制提供新的机会。在分子中，XUV 激发与快速内价电子现象、相关的二电子过程以及强烈相互依赖的电子和核动力学相关。由于探测固有的低横截面光碎裂通道的光谱困难，对这种情况下时间分辨动力学的理解非常有限。高激发系统中势能表面流形的复杂性；以及缺乏高效、可调谐、飞秒/阿秒 XUV 光子源。该项目旨在通过利用尖端研究工具（例如定制的 XUV 脉冲和高效的照片碎片成像方案）来研究这一机制。更广泛的方面包括职业教育目标，这将增加西班牙裔学生在物理研究中的代表性；直接让本科生参与超快科学研究；并导致互动学习项目的开发和基于网络的传播。这种培训和推广以及前沿研究将有助于使我们的国家在阿秒和飞秒科学领域更具竞争力。该教育计划针对的是代表性不足群体的学生。通过与主要西班牙裔机构 (UTEP) 合作，西班牙裔学生将获得前沿研究领域的实践经验和重要接触。在研究生和本科生的参与下，该教育计划促进了光学/AMO 交互式学习计划的开发，以及基于网络的出版和传播方法，以对更广泛的社区有用的方式。该计划的研究副产品将以新的见解和发现的形式出现，这将影响其他相关领域，如量子光学、理论原子和分子物理、相干控制、大气化学、化学成像和辐射化学。