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Emerging investigator series: critical review of photophysical models for the optical and photochemical properties of dissolved organic matter.
Environmental Science: Processes & Impacts ( IF 5.5 ) Pub Date : 2020-03-24 , DOI: 10.1039/d0em00056f
Garrett McKay 1
Affiliation  

Optical measurements (absorbance and fluorescence) are widely used to track dissolved organic matter (DOM) quantity and quality in natural and engineered systems. Despite many decades of research on the optical properties of DOM, there is a lack of understanding with regards to the underlying photophysical model that is the basis for these optical properties. This review both summarizes advances to date on the photophysical properties of DOM and seeks to critically evaluate the photophysical models for DOM optical properties. Recent studies have refined the quantitative understanding of DOM photophysical properties such as excited state lifetimes and energies, rates of different photophysical processes, and quantum yields. Considering fundamental models, more clarity is needed on whether DOM photophysical processes are due to a superposition of non-interacting components (superposition model), or whether a portion of optical signals can be ascribed to electronically interacting moieties, for example in the form of electron donor–acceptor complexes (charge transfer model). Multiple studies over more than two decades have provided evidence for the charge transfer model. Questions have been raised, however, about the broad applicability of the charge transfer model. The charge transfer and superposition model are critically reviewed in light of this current research. Recommendations are given for future studies to help clarify the accuracy of these competing photophysical models.

中文翻译:

新兴研究者系列:关于溶解有机物的光学和光化学特性的光物理模型的批判性评论。

光学测量(吸光度和荧光)已广泛用于跟踪自然和工程系统中的溶解有机物(DOM)的数量和质量。尽管对DOM的光学特性进行了数十年的研究,但是对于作为这些光学特性基础的基本光物理模型仍缺乏了解。这篇综述既总结了DOM的光物理性质的最新进展,也试图严格评估DOM光学性质的光物理模型。最近的研究完善了对DOM光物理性质的定量理解,例如激发态寿命和能量,不同光物理过程的速率以及量子产率。考虑基本模型,关于DOM光物理过程是由于非相互作用成分的叠加(叠加模型),还是将一部分光信号归因于电子相互作用的部分(例如,以电子供体-受体复合物的形式),则需要更加清晰(费用转移模型)。超过二十年的多项研究为电荷转移模型提供了证据。但是,人们对电荷转移模型的广泛适用性提出了疑问。根据这项最新研究,对电荷转移和叠加模型进行了严格审查。为将来的研究提供了建议,以帮助阐明这些竞争性光物理模型的准确性。或者是否可以将一部分光信号归因于电子相互作用的部分,例如以电子供体-受体复合物的形式(电荷转移模型)。超过二十年的多项研究为电荷转移模型提供了证据。但是,人们对电荷转移模型的广泛适用性提出了疑问。根据这项最新研究,对电荷转移和叠加模型进行了严格审查。为将来的研究提供了建议,以帮助阐明这些竞争性光物理模型的准确性。或者是否可以将一部分光信号归因于电子相互作用的部分,例如以电子供体-受体复合物的形式(电荷转移模型)。超过二十年的多项研究为电荷转移模型提供了证据。但是,人们对电荷转移模型的广泛适用性提出了疑问。根据这项最新研究,对电荷转移和叠加模型进行了严格审查。为将来的研究提供了建议,以帮助阐明这些竞争性光物理模型的准确性。关于电荷转移模型的广泛适用性。根据这项最新研究,对电荷转移和叠加模型进行了严格审查。为将来的研究提供了建议,以帮助阐明这些竞争性光物理模型的准确性。关于电荷转移模型的广泛适用性。根据这项最新研究,对电荷转移和叠加模型进行了严格审查。为将来的研究提供了建议,以帮助阐明这些竞争性光物理模型的准确性。
更新日期:2020-03-24
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