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Combining spectroscopic techniques to determine the optical constants of powdered lactose

机译：结合光谱技术来确定粉末乳糖的光学常数

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摘要

A method for deriving the optical constants (n/k) of organic powdered materials using pressed pellets in the mid-infrared spectral range is introduced that combines variable angle spectroscopic ellipsometry and transmission spectroscopy. The approach is applied to anhydrous lactose, in which three different forms of pellets were pressed and measured: a pure lactose pellet and a mixed lactose/potassium bromide (KBr) pellet with a large analyte percentage were used for ellipsometric measurements, and a KBr transmission pellet with only a small analyte percentage was used for transmission measurements. The transmittance data provide an initial set of oscillators and improve the spectral fitting of weak absorption features (k < 0.01). Ellipsometric data for the pure and mixed pellets are then fit simultaneously to derive the final n/k values for lactose from 6000-400 cm(-1). An alternative method just using the ellipsometric data from the mixed pellet and the transmittance data is also presented and shows good agreement with the multi-sample analysis, providing a simpler method for powders that do not press easily into pure pellets. Finally, the derived optical constants were used to model the reflectance data, demonstrating a good match with the measured reflectance spectra if non-idealities are included. (C) 2021 Optical Society of America
机译：介绍了一种在中红外光谱范围内利用压片推导有机粉末材料光学常数（n/k）的方法，该方法结合了可变角度椭圆偏振光谱法和透射光谱法。该方法适用于无水乳糖，其中三种不同形式的颗粒被压制和测量：纯乳糖颗粒和具有较大分析物百分比的混合乳糖/溴化钾（KBr）颗粒用于椭偏测量，仅具有较小分析物百分比的KBr透射颗粒用于透射测量。透过率数据提供了一组初始振荡器，并改善了弱吸收特征的光谱拟合（k<0.01）。然后同时拟合纯颗粒和混合颗粒的椭偏数据，得出6000-400 cm（-1）范围内乳糖的最终n/k值。还提出了一种仅使用混合颗粒的椭偏数据和透射率数据的替代方法，该方法与多样品分析结果吻合良好，为不易压入纯颗粒的粉末提供了一种更简单的方法。最后，使用导出的光学常数对反射率数据进行建模，如果包含非理想性，则表明与测量的反射光谱非常匹配。（2021）美国光学学会

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