Ultrafast Dynamics of Stretched Liquids

9418361 Fourkas波士顿学院的启动基金将支持John Fourkas教授的研究。研究将集中在拉伸液体的超快动力学上。负压技术将用于控制分子间引力的相对重要性。超快非线性光学光谱技术将被用作一种敏感的、实时的探针，用于观察受张力引起的分子间电位变化影响的微观动力学。光学克尔效应实验将监测拉伸对分子间振动和分子内定向动力学的影响，这两者都受到引力的强烈影响。最初的实验将包括研究水的异常行为，并将开发技术来研究在实际负压下的任意液体。分子间相互作用的吸引和排斥作用的详细知识对于理解溶液中化学过程的微观细节至关重要，最终目标是能够通过液体本身性质的变化直接观察和控制溶液中的化学反应过程。

9418361 Fourkas This starter grant award to Boston College will support the research of Professor John Fourkas. The research will focus on ultrafast dynamics of stretched liquids. Negative presure techniques will be used to control the relative importance of intermolecular attractive forces. Ultrafast nonlinear-optical spectroscopic techniques will be used as a sensitive, real-time probe of the microscopic dynamics that are affected by tension-induced changes in the intermolecular potential. Optical Kerr effect experiments will monitor the effects of stretching on intermolecular vibrational and intramolecular reorientational dynamics, both of which are strongly affected by attractive forces. Initial experiments will involve studying anomalous behavior of water, and techniques will be developed to study arbitrary liquids at substantial negative pressures. A detailed knowledge of the roles of attractive and repulsive intermolecular interactions is essential in developing an understanding of the microscopic details of chemical processes in solution with the ultimate goal of being able to observe and control directly the course of chemical reactions in solution through changes in the nature of the liquid itself.