Raman spectroscopy of lithium hydride corrosion: Selection of appropriate excitation wavelength to minimize fluorescence

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• 作者：Ashley C. Stowe ; ^{stoweac@y12.doe.gov} ; Norm Smyrl
• 关键词：Lithium hydride ; Hydrolysis ; Hydrogen storage ; Raman ; UV Raman
• 刊名：Vibrational Spectroscopy
• 出版年：2012
• 期刊代码：113_09242031
• 类别：ms
• 出版时间：May, 2012
• 卷：60
• 期：Complete
• 页码：133-136
• 文件大小：329 K

摘要

Lithium hydride is pyrophoric and will efficiently react with moisture forming lithium hydroxide on the surface. Typically, this surface corrosion reaction is examined by diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy. In the current study, Raman spectroscopy has been used to evaluate the same reaction with a focus on the role of Li₂O in particular. A number of visible and near infrared excitation lasers were investigated in order to achieve the highest sensitivity; however, fluorescence dominates the spectrum. Photo bleaching experiments resulted in fluorescence reduction after illumination. Photoluminescence spectra indicate that the UV excitation could provide a luminescence-free region to collect high quality Raman spectra for LiH. A custom Raman probe was used to study the hydrolysis reaction of LiH with a 325 nm laser. Further, the role of lithium oxide in the hydrolysis kinetics has been studied.