U.S.-France Cooperative Research: Probing Dynamics in Open Shell Atoms and Molecules using Two Photons Experiments

这项为期三年的美法合作研究旨在探索激光激发原子和分子系统中少体和多体过程的动力学。西密歇根大学的Norah Berrah和一名学生每年将前往法国，与Denis Cubaynes领导的法国团队一起工作，Denis Cubaynes是巴黎南大学Rayonnement X Avec La Matiere实验室的科学家。利用高分辨率光电子能谱和离子管理探测器，研究人员提出对原子金属蒸气和分子进行光激发和光电离实验。他们将使用不同的光子源，包括来自第三代辐射源的高光谱分辨率单色光子束，即劳伦斯伯克利国家实验室的先进光源。本计划将增进对VUV光子物质基本相互作用的了解。它将为相关系统的基本理解提供气相视角，并将为欧洲和美国正在进行的第四代光源（自由电子激光）的未来时间分辨研究奠定基础。例如，俄歇过程的时间分辨研究可以用一些拟议的超快光源进行调查。更广泛的影响拟议中的项目将为研究生提供研究培训，并通过与欧洲领先研究人员建立新的联系来促进他们的职业发展。通过与法国团队的合作，学生将提高他们的实验技能，并获得国际合作的宝贵经验。由此产生的研究也将影响其他领域，并且可以被认为是纳米结构和高度相关材料的使能科学。

This three-year award for U.S.-France cooperative research explores the dynamics of few- and many-body processes in laser-excited atomic and molecular systems. Norah Berrah of Western Michigan University and a student will travel to France annually to work with the French team led by Denis Cubaynes, a scientist in Laboratoire d'Interaction du Rayonnement X Avec La Matiere at the University of Paris South. Using high-resolution photoelectron spectroscopy and an ion-managing detector, the investigators propose to carry out photo-excitation and photo-ionization experiments on atomic metal vapors and molecules. They will use different photon sources, including a high spectral-resolution monochromatic photon beam from a third generation radiation source, the Advanced Light Source at Lawrence Berkeley National Laboratory. Intellectual MeritThe proposed project will increase understanding of fundamental VUV photon matter interactions. It will offer a gas-phase perspective on the basic understanding of correlated systems and will set the stage for future time-resolved studies with Fourth Generation Light Source (Free Electron Laser) which are underway in Europe and the U.S. For example, time-resolved studies of Auger processes could be investigated with some of the proposed ultra fast light sources.Broader ImpactsThe proposed project will provide research training to graduate students and advance their careers through new connections to leading European researchers. By working with the French team, students will enhance their experimental skills and gain invaluable experience in international collaboration. The resulting research will also impact other fields and could be considered as an enabling science for nanostructures and highly correlated materials.