CAREER: The Nature of Excitations in Dendrimers and Educational Development of the Physical Properties of Macromolecules

这项职业奖涉及对树状大分子的超快速光谱研究。首先，飞秒时间分辨测量将在均匀和非均匀枝状聚合物系统上进行上转换设置，以研究激发的相干性质。一些新型树突状体系的长辐射寿命也将通过时间相关单光子计数测量来测量。这些初步研究也将确定其他发光应用的最佳候选材料。在第二阶段的各向异性测量，以探索在有机树状大分子的能量迁移过程的快速动力学。为了更定量地测量具有强相互作用的树状聚合物体系的均匀线宽以及脱相动力学，他将进行三次脉冲光子回波实验。有了这些信息，就可以对各种激子理论预测进行定量比较。这项研究将有助于回答一个重要的问题，不仅涉及有机树状大分子，而且涉及任何分支（分形）分子几何结构的激发。我们如何描述强相互作用的分支发色团的连贯性质，这个问题将对材料科学、光物理学和技术界产生重大影响。CAREER教育计划的重点是大分子的物理和表征。第一个组成部分是让本科生接触到与大分子物理性质有关的工业研究和开发的真实世界。其次，PI将把这些项目整合到更大的群体互动中。这将包括底特律地铁公立学区的本科生和低年级高中生，过去这个地区在科学领域的代表性不足。这将与PI参与的正在进行的项目一起完成，包括acs项目的SEED项目。CAREER教育计划的第三个组成部分是通过增加对大分子的指导和实验理解来加强物理化学讲座和实验课程的教学方面。

This CAREER award involves ultra fast spectroscopic investigations of dendrimers. Initially, femtosecond time-resolved measurements will be carried out with an upconversion setup on both homogeneous and inhomogeneous dendrimer systems in order to investigate the coherent nature of the excitations. The long radiative lifetimes of several of the novel dendrimer systems will also be measured by time-correlated single-photon counting measurements. These initial studies will also determine superior candidates for other light emitting applications as well. In the second stage of the anisotropy measurements in order to probe the fast kinetics of the energy migration process in organic dendrimers. In order to measure the homogeneous line-width more quantitatively as well as the dephasing dynamics in the dendrimer systems that possess strong interactions, he will carry out three pulse photon echo experiments. With this information quantitative comparisons to various excitonic theoretical predictions can be carried out. This research will help answer an important question that not only concerns organic dendrimers, but also concerns excitations in any branched (fractal) molecular geometry. The question, how do we describe the coherent nature of strongly interacting branched chromophores, will have a significant impact on the materials science, photo-physics, and technological communities.%%%The CAREER educational plan is focused on the physics and characterization of macromolecules. The first component is to expose undergraduate students to the real world of research and developments in industry that is concerned with the physical properties of macromolecules. Secondly, the PI will integrate these programs into larger group interactions. This will include both undergraduate and younger high school students in the Detroit Metro public school district, an area that has been underrepresented in science in the past. This will be done in conjunction with ongoing programs that the PI is involved with including the ACS-project SEED program. The third component to the CAREER educational plan is to enhance the instructional aspects of the physical chemistry lecture and laboratory courses by including more instruction and experimental understanding of macromolecules.