Structure and Dynamics of Isolated Molecular Clusters

在这个项目中的物理化学计划的 化学部，迈克尔托普教授的大学 宾夕法尼亚州将使用皮秒分辨率的偏振 光谱学在冷却射流膨胀研究结构和 分子团簇的动力学 使用时域 旋转相干技术，Topp建议获得 结构信息，以便了解 能源转移和相关过程，在这些有组织的 系统. 这些信息很难获得更多 正常频率分辨光谱技术。 的 芳香分子二萘嵌苯将用于大部分的 结构工作，涉及不同的复合 烷烃和各种极性和不饱和分子， 静电相互作用 %%% 原子或分子的小团成核， 吸收和发射可见光的有机分子 研究分子间力的宝贵机会， 在溶液和吸附过程中， 分子到扩展表面上。 激光可用于 激发这些大的有机分子， 相关集群的演变可以在非常 快速的时间尺度，以便能够确定结构 和这些微观组织系统的动力学。 等 信息可以影响许多领域，包括 催化和生命过程的化学。

In this project in the Physical Chemistry Program of the Chemistry Division, Professor Michael Topp of the University of Pennsylvania will use picosecond-resolution polarization spectroscopy in cooled jet expansions to study structure and dynamics in molecular clusters. Using the time-domain rotational coherence technique, Topp proposes to obtain structural information on clusters in order to understand energy transfer and related processes in these organized systems. Such information is difficult to obtain by more normal frequency resolved spectroscopic techniques. The aromatic molecule perylene will be used in much of the structural work, involving the complexation of different alkanes and various polar and unsaturated molecules with large electrostatic interactions. %%% The nucleation of small clusters of atoms or molecules by large organic molecules which absorb and emit visible light presents valuable opportunities to study intermolecular forces of the kind found on a larger scale in solutions and in the adsorption of molecules onto extended surfaces. Lasers can be used to excite these large organic molecules, and then the time evolution of the associated cluster can be followed on very fast time scales in order to be able to determine the structure and dynamics of these microscopic organized systems. Such information can have a bearing on many fields, including catalysis and the chemistry of life processes.