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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Extracting Information on Linear and Nonlinear Absorption from Two-Beam Action Spectroscopy Data
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Extracting Information on Linear and Nonlinear Absorption from Two-Beam Action Spectroscopy Data

机译：从双光束动作光谱数据提取关于线性和非线性吸收的信息

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摘要

Two-beam action (2-BA) spectroscopies are a recently developed class of techniques for determining the order(s) of absorption (one-photon, two-photon, etc.) that contribute to an observable signal. When only a single order of absorption is present, 2-BA spectroscopies allow for the determination of that order from data obtained at a single value of the observable. It has been shown previously that when two orders of absorption are present, they can be determined unambiguously from measurements made at several values of the observable. However, this latter approach cannot be used for single-valued observables, such as a polymerization threshold. Here we develop a theoretical comparison between conventional methods that determine the order(s) of absorption using logarithmic plots and 2-BA-based techniques. We also explore how 2-BA plots arising from two orders of absorption deviate from a plot with a single, noninteger exponent. We demonstrate that these deviations can usually be used to identify the two orders of absorption and their relative contributions to the signal on the basis of measurements made at a single value of the observable.
机译：双光束动作（2-BA）光谱是最近开发的用于确定有助于可观察信号的吸收的顺序（单光子，双光子等）的顺序。当仅存在单个吸收时，2-BA光谱允许从可观察到的单个值获得的数据确定该顺序。先前已经显示出，当存在两个吸收令时，可以从在观察到的几个值下的测量中明确地确定它们。然而，这种后一种方法不能用于单值可观察到，例如聚合阈值。在这里，我们在使用对数图和基于2-BA的技术确定吸收顺序的传统方法之间进行理论比较。我们还探讨了两个吸收秩序中出现的2-BA图，偏离了一个非整数指数的剧情。我们证明，这些偏差通常可用于识别基于在可观察到的单个值的单一值进行的测量的信号的两个吸收顺序和它们的相对贡献。

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