Molecular Radiative and Relaxation Processes

加州尔湾大学的Shaul Mukamel因设计、建模和分析相干非线性多维光谱而获得化学系理论、模型和计算方法项目的奖项。刘维空间中的超算子方法正在开发中，并用作涉及快脉冲光和物质相互作用的应用的计算工具：（1）相干和非相干飞秒单分子光谱学，包括尖端和结载流接触的非平衡情况，（2）量子场纠缠光子的多维光谱学，（3）分子发色团聚集体和量子点阵列中的电荷分离和多激子光谱特征，以及（4）使用灵活的脉冲偏振策略的分子手性的飞秒相干反斯托克斯拉曼散射探针。 这些和许多其他实验使用刘维的方法进行描述，并使用软件SPECTRON创建多维光学电子和振动光谱计算建模，并提供给研究界。 分子对不同光束的响应取决于许多因素，例如光束在空间和时间上相互重叠的程度以及分子。 PI已经开发了工具来计算不同情况下的响应，例如当分子也被扫描隧道显微镜尖端探测或在两个电引线之间传输电流时。 每个波束也可以是一系列非常快速重复的脉冲，丰富了可以诱发的反应的集合。 许多最有趣的实验可以使用PI创建的方法和软件进行模拟，这些实验涉及接近分子样品或从分子样品散射的光子之间的特定类型的相关性，甚至可以由单个分子组成。 PI的书“非线性光学原理”是该社区研究的主要指南，并正在根据该奖项进行广泛的修订。 由PI指导的学生和博士后研究员培养了一批接受这些方法培训的稳定的研究人员。

Shaul Mukamel of the University of California Irvine is supported by an award from the Theory, Models and Computational Methods program in the Chemistry Division for the design, modeling and analysis of coherent nonlinear multidimensional spectroscopies. Superoperator approaches in Liouville space are being developed and used as computational tools for applications involving interactions of fast-pulsed light and matter: (1) Coherent and incoherent femtosecond single-molecule spectroscopy, including non-equilibrium circumstances with tip and junction current-carrying contacts, (2) multidimensional spectroscopy with entangled photons of quantum fields , (3) charge separation and multi-exciton spectroscopic signatures in molecular chromophore aggregates and quantum dot arrays, and (4) femtosecond coherent anti-Stokes Raman scattering probes of molecular chirality using flexible pulse-polarization strategies. These and numerous other experiments are described using the Liouville approach, and computationally modeled using software SPECTRON created for multidimensional optical electronic and vibrational spectroscopy and made available to the research community. The response of a molecule to different light beams depends on many factors, such as how much the beams overlap with each other and the molecule in both space and time. The PI has developed the tools to calculate the responses under different circumstances, such as when the molecule is also being probed by a scanning tunneling microscope tip or is carrying current between two electrical leads. Each beam can also be a series of pulses repeated very quickly, enriching the collection of responses that can be evoked. Many of the most interesting experiments that can be simulated using the methods and software created by the PI involve definite types of correlations between photons approaching or scattering from the molecular sample, which can consist of even a single molecule. The PIs book "The Principles of Nonlinear Optics" is the principal guidebook for research in this community and is undergoing extensive revision under this award. A steady flow of researchers trained in these methods is produced by the students and postdoctoral fellows mentored by the PI.