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Application of thin-film interference coatings in infrared reflection spectroscopy of organic samples in contact with thin metal films

机译:薄膜干涉膜在有机样品与金属薄膜接触的红外反射光谱中的应用

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摘要

A thin dielectric IR-transparent interlayer is introduced between an IR-transparent medium of incidence and a thin metal film. The interlayer increases the intensity of light on the metal/sample interface at certain wavenumbers. By computations, the reflectivities of the system "calcium fluoride (CaF_(2))-germanium (Ge)-gold (Au) sample" are analyzed as a function of incidence angle and Ge layer thickness. Absorbance spectra with acetonitrile as a sample are recorded for different angles of incidence and polarizations and compared to computations. A characteristic feature of the absorbance spectra is the occurrence of interference fringes distributed between 1000 and 6000cm~(-1), i.e., over the complete mid-IR wavelength range into the near-IR. These fringes could be used in analytical spectroscopy.
机译:在红外透明入射介质和金属薄膜之间引入一个薄的,红外透明的介电中间层。中间层在某些波数下增加了金属/样品界面上的光强度。通过计算,分析了系统“氟化钙(CaF_(2))-锗(Ge)-金(Au)样品”的反射率与入射角和Ge层厚度的关系。记录乙腈作为样品的吸收光谱,记录不同入射角和极化角,并将其与计算结果进行比较。吸收光谱的特征是在1000至6000cm〜(-1)之间分布干扰条纹,即在整个中红外波长范围内进入近红外。这些条纹可用于分析光谱。

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