Differentiation of positional isomers of propyl alcohols using filament-induced fluorescence
首发时间:2016-03-03
Abstract:We experimentally demonstrate the recognition of positional isomers of propyl alcohol vapor through nonlinear fluorescence induced by the high-intensity femtosecond laser filaments in air. By measuring characteristic fluorescence of n-propyl and isopropyl alcohol vapors produced by femtosecond filament excitation, it is found that they show identical spectra, namely those from molecular bands CH, C2 and CN, but the relative intensities are different, which can be used to differentiate the two propyl alcohol isomers. The different signal intensities were ascribed to different ionization potential of the isomer molecules, leading to different efficiency of fluorescing fragments.
keywords: femtosecond laser filament laser-induced fluorescence positional isomers
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光丝诱导荧光分辨丙醇分子位置异构体
摘要:本文实验展示了利用高强度飞秒激光光丝非线线荧光光谱法分辨丙醇分子位置异构体。通过测量光丝激发正丙醇与异丙醇分子的特征荧光光谱,我们发现二者均产生CH, C2 和CN的特征指纹荧光,但它们的相对强度明显不同。因此,我们提出了利用荧光相对强度差别分辨丙醇的位置异构体的新方法。该现象观察主要源于丙醇分子位置异构体具有不同的电离势,强场多光子电离和解离的不同产额导致了不同的荧光强度。
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