Ultrafast Nonlinear and Coherent Spectroscopic Studies of Molecular Motion in Liquids

马克贝格博士是由实验资助 物理化学程序来研究分子运动 在溶液中溶质附近的溶剂分子。 贝格将使用先进的激光技术来研究 溶质分子在其局部溶剂中的振动运动 笼，和当地溶质的合作重排- 溶剂结构 本研究将探讨溶剂运动周围的一个 溶质分子以及运动与 溶质的电子、振动和取向状态。 超快激光技术将允许直接时间 液体基本运动的解析。 通过 非线性和相干光谱技术的组合 将有可能区分 不同类型的溶剂动力学。 这些技术， 特别是瞬态烧孔和拉曼回波， 了解类似物在固态和气相，但有 以前没有广泛应用于液态。 这些 实验将导致新的测量溶质 重定向动力学，和振动的离域 纯溶剂中的运动。

Dr. Mark Berg is supported by a grant from The Experimental Physical Chemistry Program to investigate the molecular motions of solvent molecules in the vicinity of a solute in solution. Berg will use sophisticated laser techniques to study the rattling motion of solute molecules within their local solvent cages, and the cooperative rearrangements of the local solute- solvent structure. This research will explore the solvent motion around a solute molecule and the coupling of that motion to the electronic, vibrational and orientational states of the solute. Ultrafast laser technology will permit the direct time resolution of the fundamental motion in liquids. Through a combination of nonlinear and coherent spectroscopic techniques it will be possible to discriminate between the effects of different types of solvent dynamics. These techniques, specifically transient hole burning and Raman echoes, have well understood analogues in the solid state and gas phase, but have not previously been widely applied to the liquid state. These experiments will lead to new measurements of solute reorientational dynamics, and the delocalization of vibrational motion in pure solvents.