Investigation of photophysical processes as the basis for quantitative imaging of gas-phase mixing processes with tracer LIF

该研究项目的目的是提高对有机示踪剂（对）分子荧光的光物理理解，以及在扩展参数范围（温度、压力、浴气组成）内表征荧光特性，并收集扩展数据集网络数据库（TracerSim）。气相中混合过程的定量时间和空间分辨观察对于优化例如，气相合成或燃烧过程。为此目的，有机分子通常用作成像诊断中的荧光示踪剂（示踪剂激光诱导荧光，示踪剂LIF）以确定感兴趣的定量信息（例如，温度或混合质量），因为荧光性质对环境条件敏感。在这个研究项目中产生的洞察力，然后可以通过更好地理解潜在的地球物理学来改进诊断方法。为此，第二个供资期侧重于以下专题：（a）在过去几年中，同时使用两种或两种以上的示踪剂来联合测定混合物中的若干数量。已经反复指出，激发分子的相互作用没有被充分理解，以能够无误差地解释测量的信号强度。现在，这种知识的缺乏将通过在受控条件下表征和建模示踪剂-示踪剂相互作用来填补。此外，在第一个资助期内获得的关于自猝灭和关于激发波长的影响的结果，这表明在实际情况下对示踪物LIF的应用是重要的，将使用进一步的实际相关示踪物进行验证。B）在第一个资助期确定的荧光特性以及新测量的进一步示踪物的数据将被包括在已经部分实施的网络中。TracerSim数据库该数据库将进一步完善，并将促进所收集的生物物理学数据的可用性，从而有助于在整个研究界更好地使用示踪剂-LIF。c）该项目的新结果将被实施到已建立的生物物理学荧光量子产率模型中，以提高数据解释能力，并将其适用性扩展到迄今为止尚未研究的其他物种。这些模型将被纳入TracerSim网络数据库，用于内插和外推。此外，将实施实验示踪剂LIF数据的分析工具。

The aim of this research project is the improvement of the photophysical understanding of the molecular fluorescence of organic tracer (pairs) as well as the characterization of fluorescence properties in an extended parameter range (temperture, pressure, bath gas composition) and the collection of extended datasets in a web database (TracerSim). Quantitative time- and spatially resolved observation of mixing processes in the gas phase is important for optimizing of, e.g., gas-phase-synthesis or combustion processes. For this purpose, organic molecules are often used as fluorescence tracers in imaging diagnostics (tracer laser-induced fluorescence, tracer-LIF) to determine the quantitative information of interest (e.g., temperature or mixing quality) since fluorescence properties are sensitive to the environmental conditions. The insight generated in this research project can then be used the improvement of diagnostics methods through a better understanding of the underlying photophysics. For this purpose, the second funding period focuses on the following topics:a) In the past years, two or more tracers were used simultaneously for the combined determination of several quantities in mixtures. It has been repeatedly stated that the interaction of the excited molecules is not sufficiently understood to be able to interpret the measured signal intensities without errors. Now, this lack of knowledge will be filled by characterizing and modeling the tracer-tracer interaction under controlled conditions. Furthermore, the results on self-quenching and on the influence of the excitation wavelength gained in the first funding period, which showed to be important for the application of tracer LIF in practical situations will be validated using further practically-relevant tracers.b) The fluorescence properties determined in the first funding period as well as newly measured data for further tracers will be included into the already partially implemented web-based TracerSim database. This database will be further refined and will facilitate the usability of the collected photophysics data and will thus contributes to a better usage of tracer-LIF in the entire research community.c) The new results of this project will be implemented into established photophysical fluorescence quantum yield models to improve the data interpretation capabilities and to extend their applicability to further species, not investigated so far. The models will be integrated into the TracerSim web database for interpolation and extrapolation. Furthermore, an analysis tool for experimental tracer-LIF data will be implemented.