Clusters and Fluids at High Pressure: Ultrafast Dynamics

在过去的三年中，这项研究主要集中在使用超快激光光谱来探测分子动力学。新的研究将集中在三个方向：(a)大（纳米）分子簇的实时动力学研究；(b)在高达4000个大气压的高压下研究材料的光物理和光化学动力学；(c)使用新型激光技术来检查和控制非均匀系统中的选择性过程。目的是在这些新的控制条件下，解决皮秒和飞秒动力学，尺寸，密度和距离，并了解控制过渡到凝聚相极限的力。本研究是关于团簇和高压下的超快动力学的研究。目标是使用超快激光技术，皮秒和飞秒激光，来解析和研究从孤立分子到凝聚相极限过渡的动力学的重要特征。对高压下微观大簇和系统的研究提供了独特的机会，可以在基本水平上测试在大小、密度和距离受控条件下的分子相互作用。这些研究将涵盖基本和复杂的分子系统。＊＊＊

9520839 Zewail Over the past three years, this research has been centered on the use of ultrafast laser spectroscopy to probe molecular dynamics. The new research will focus on three directions: (a) studies of real-time dynamics in large (nano) molecular clusters; (b) studies of the photophysical and photochemical dynamics of materials under high pressure, reaching up to 4000 atmospheres; and (c) the use of novel laser techniques to examine and control selective processes in inhomogeneous systems. The objectives are to resolve the primary picosecond and femtosecond dynamics under these novel conditions of controlled, size, density and distance, and to learn about forces governing the transition to the condensed phase limit. %%% This research is concerned with the investigation of the ultrafast dynamics in clusters and at high pressures. The goal is to use ultrafast laser techniques, with picosecond and femtosecond lasers, to resolve and study important features of the dynamics involved in the transition from the isolated molecule to the condensed-phase limit. Studies of microscopic large clusters and systems at high pressures offers unique opportunities to test, on a fundamental level, molecular interactions under controlled conditions of size, density, and distance. These studies will cover elementary and complex molecular systems. ***