Etalon features in infrared spectra of stratified samples, their influence on the interpretation, and methods to circumvent their presence in infrared spectra have been in discussion for decades. This paper focuses on the application of a method originally developed to remove interference fringes in the mid-infrared spectra for far-infrared Fourier transform spectroscopy on thin polymer films. We show that the total transmittance reflectance technique, commonly used for mid-infrared, also works successfully in the far-infrared spectral range where other approaches fail. Experimental spectra obtained by such technique are supported by model calculations and reveal the possibility and limits to obtain almost undisturbed far-infrared spectra which are suitable to determine low-energy vibrations of ionomer salts under certain sample conditions.

中文翻译：

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EXPRESS：去除聚合物薄膜远红外-太赫兹透射光谱中的标准具特征

几十年来，人们一直在讨论分层样品红外光谱中的标准具特征、它们对解释的影响以及规避它们在红外光谱中存在的方法。本文重点介绍了一种最初开发的方法的应用，该方法用于去除聚合物薄膜上的远红外傅里叶变换光谱中红外光谱中的干涉条纹。我们表明，通常用于中红外的全透射反射技术在其他方法失败的远红外光谱范围内也能成功地工作。通过这种技术获得的实验光谱得到模型计算的支持，并揭示了获得几乎不受干扰的远红外光谱的可能性和局限性，这些光谱适用于在某些样品条件下确定离聚物盐的低能振动。