Multidimensional Femtosecond Studies of Chemical Reaction Dynamics

在这个由化学部的化学结构，动力学和机制计划资助并由国际科学与工程办公室共同资助的项目中，位于博尔德的科罗拉多大学的大卫乔纳斯教授将开发二维傅里叶变换飞秒光谱的方法，其脉冲接近电磁光谱的光学和红外区域的倍频程（因子2）频率跨度。该项目包括一项国际合作，使用ICFO（西班牙）Jens Biegert实验室开发的脉冲激光源。 飞秒光谱将用于研究两类分子在圆锥形交叉点的电子和振动动力学：酞菁，其中圆锥形交叉点的动力学的温度依赖性可以测试关于振动波包宽度的作用的理论预测;和类胡萝卜素，它在保护许多生物系统免受过量阳光的影响方面发挥着不同的作用，但尚未在机械上理解。人们希望，在这个项目中开发的二维光谱学的方法将成为有用的，以确定如何在化学反应中的电子运动都驱动和原子重排驱动。参加该项目的研究生和博士后研究员将接受科学研究培训，获得国际合作的宝贵经验，并在科学专业协会和国际跨学科会议的国家会议上展示项目成果。

In this project funded by the Chemical Structure, Dynamics and Mechanisms program of the Chemistry Division and co-funded by the Office of International Science and Engineering, Professor David Jonas of the University of Colorado at Boulder will develop approaches to two-dimensional Fourier transform femtosecond spectroscopy with pulses approaching octave (factor of 2) frequency spans in the optical and infrared regions of the electromagnetic spectrum. The project includes an international collaboration to use pulsed laser sources developed in the laboratory of Jens Biegert at ICFO (Spain). Femtosecond spectroscopy will be used to study the electronic and vibrational dynamics at conical intersections in two classes of molecules: phthalocyanines, where the temperature dependence of dynamics at conical intersections can test theoretical predictions about the role of vibrational wavepacket width; and carotenoids, which play diverse and not yet mechanistically understood roles in protecting many biological systems from excess sunlight. It is hoped that the approaches to two-dimensional spectroscopy developed in this project will become useful for determining how electronic motions both drive and are driven by atomic rearrangements in chemical reactions. Graduate students and a postdoctoral researcher participating in the project will be trained in scientific research, gain valuable experience in international collaboration, and present project results at national meetings of scientific professional societies and international interdisciplinary conferences.