标题： 极化投影密度矩阵：从各向同性样品中恢复分子框架信息的实用方法 显示英文标题

标题： The Polarization Projected Density Matrix: A Practical Way to Recover Molecular Frame Information from Isotropic Samples

摘要： 我们提出一种新方法来模拟从随机取向分子中发出的超快时间依赖非线性光学极化敏感信号。 通过将实验室框架中的分析器极化轴投影到分子框架，并通过张量积将该轴与密度矩阵联系起来，我们展示了一种方法，以找到一个特定的分子取向，该取向能对由相同模型产生的四波混频信号进行良好近似，但需要对分子取向进行平均。 显示英文摘要

摘要： We present a novel approach to model ultrafast time-dependent nonlinear optical polarization sensitive signals emitted from randomly-oriented molecules. By projecting the laboratory-frame analyzer polarization axis into the molecular frame and linking that axis with the density matrix through a tensor product, we demonstrate an approach to find a specific molecular orientation that yields a good approximation to simulated four-wave mixing signals produced by the same model but with averaging over molecular orientation.