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

这项职业奖涉及树枝状大分子的超高速光谱研究。最初，飞秒时间分辨测量将在均相和非均相树枝状大分子系统上用上转换装置进行，以研究激发的相干性质。几种新型树状大分子系统的长辐射寿命也将通过时间相关的单光子计数测量来测量。这些初步研究还将确定其他发光应用的优秀候选者。在各向异性测量的第二阶段，以探索有机树枝状大分子中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枝状大分子体系中的均匀线宽和退相动力学，他将进行三个脉冲光子回波实验。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，这个问题不仅与有机树枝状大分子有关，而且还与任何分支(分形)分子几何中的激发有关。这个问题，我们如何描述强相互作用的分支发色团的相干性质，将对材料科学、光物理和技术界产生重大影响。%职业教育计划侧重于大分子的物理和表征。第一个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Metro公立学区的本科生和更年轻的高中生，这是一个过去在科学领域代表性不足的地区。这将与PI参与的正在进行的计划一起完成，包括ACS项目种子计划。职业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室课程的教学方面。

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.