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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Introducing a standard method for experimental determination of the solvent response in laser pump, X-ray probe time-resolved wide-angle X-ray scattering experiments on systems in solution
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Introducing a standard method for experimental determination of the solvent response in laser pump, X-ray probe time-resolved wide-angle X-ray scattering experiments on systems in solution

机译：引入用于实验确定激光泵中溶剂响应的标准方法，溶液中系统的X射线探针时间分辨广角X射线散射实验

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摘要

In time-resolved laser pump. X-ray probe wide-angle X-ray scattering experiments on systems in solution the structural response of the system is accompanied by a solvent response. The solvent response is caused by reorganization of the bulk solvent following the laser pump event, and in order to extract the structural information of the solute, the solvent response has to be treated. Methodologies capable of doing so include both theoretical modelling and experimental determination of the solvent response. In the work presented here, we have investigated how to obtain a reproducible solvent response—the solvent term—experimentally when applying laser pump, X-ray probe time-resolved wide-angle X-ray scattering. The solvent term describes difference scattering arising from the structural response of the solvent to changes in the hydrodynamic parameters: pressure, temperature and density. We present results based on NIR and dye mediated solvent heating, and demonstrate that the solvent response is independent of the heating method. The NIR heating is shown to be rendered unusable by higher order effects under certain experimental conditions, while the dye mediated solvent heating is demonstrated to exhibit first order behaviour with respect to the amount of energy deposited in the solution. We introduce a standardized method for recording solvent responses in laser pump, X-ray probe time-resolved X-ray wide-angle scattering experiments by using dye mediated solvent heating. Furthermore, we have generated a library of solvent terms, which can be used to describe the solvent term in any TRWAXS experiment, and made it available online.
机译：在时间分辨激光泵中。 X射线探针在溶液中对系统进行广角X射线散射实验时，系统的结构响应伴随着溶剂响应。溶剂响应是由于激光泵事件后本体溶剂的重组而引起的，为了提取溶质的结构信息，必须对溶剂响应进行处理。能够做到这一点的方法包括溶剂响应的理论建模和实验确定。在本文介绍的工作中，我们研究了如何在使用激光泵，X射线探针时间分辨广角X射线散射时，以实验方式获得可重现的溶剂响应（溶剂项）。溶剂术语描述了由于溶剂对流体力学参数（压力，温度和密度）变化的结构响应而引起的差异散射。我们目前基于NIR和染料介导的溶剂加热的结果，并证明溶剂响应与加热方法无关。在某些实验条件下，高阶效应显示NIR加热无法使用，而染料介导的溶剂加热则相对于溶液中沉积的能量表现出一级行为。我们介绍了一种用于记录激光泵中溶剂响应的标准方法，通过使用染料介导的溶剂加热来进行X射线探针时间分辨X射线广角散射实验。此外，我们生成了溶剂术语库，可用于描述任何TRWAXS实验中的溶剂术语，并使其在线可用。

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