Differentiation of Positional Isomers of Propyl Alcohols Using Filament-Induced Fluorescence

• 作 者: 魏祥野 涂志伟 刘畅 李贺龙 徐淮良
• 机 构: State Key Laboratory on Integrated Optoelectronics,College of Electronic Science and Engineering,Jil
• 出 处: Chinese Physics Letters
• 发表日期: 2016年05期
• 关键词: isopropyl alcohol isomers positional bands filament spectrometer silica fragment

We experimentally demonstrate the recognition of positional isomers of propyl alcohol vapor through nonlinear fluorescence induced by 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,that is,those from molecular bands of CH,C_2,NH,OH and CN,while the relative intensities are different.By comparing the ratios of the CH and C_2 signals,the two propyl alcohol isomers are differentiated.The different signal intensities are ascribed to different ionization potentials of the two isomer molecules,leading to different production efficiencies of fluorescing fragments.

We experimentally demonstrate the recognition of positional isomers of propyl alcohol vapor by nonlinear fluorescence induced by high-intensity femtosecond laser filaments in air. By measuring the characteristic fluorescence of n-propyl and isopropyl alcohol vapors produced by femt identical spectra, that is, those from molecular bands of CH, C 2, NH, OH and CN, while the relative intensities are different. By comparing the ratios of the CH and C_2 signals, the two propyl alcohol isomers are differentiated. the different signal intensities are ascribed to different ionization potentials of the two isomer molecules, leading to different production efficiencies of fluorescing fragments.