Azam Md S, Ranson Malcolm D, Hore Dennis K
Department of Chemistry, 8205University of Victoria, Victoria, BC, Canada.
Department of Computer Science, 8205University of Victoria, Victoria, BC, Canada.
Appl Spectrosc. 2022 Oct;76(10):1254-1262. doi: 10.1177/00037028221094598. Epub 2022 May 25.
We demonstrate a straightforward method by which a commonly available reference sample such as water can be used to calibrate an attenuated total internal reflection infrared absorbance measurement in order to account for the polarization of the beam incident on the internal reflecting element, and the spread of angles about the nominal angle of incidence. This enables quantitative comparison of attenuated total reflection-derived absorbance data with spectra calculated from optical constants. We then apply this calibration to the measurement of temperature-dependent absorption spectra of a polydimethylsiloxane sample. We illustrate that the extracted optical constants scale with the temperature-dependent changes in the polymer density better than the raw absorbance values on vibrational resonance.
我们展示了一种简单的方法，通过该方法可以使用诸如水之类的常见参考样品来校准衰减全内反射红外吸光度测量，以考虑入射到内反射元件上的光束的偏振以及围绕标称入射角的角度分布。这使得能够将衰减全反射衍生的吸光度数据与根据光学常数计算的光谱进行定量比较。然后，我们将这种校准应用于聚二甲基硅氧烷样品的温度依赖性吸收光谱的测量。我们表明，提取的光学常数与聚合物密度随温度的变化成比例，比振动共振时的原始吸光度值表现更好。
