The UATR Polarization Accessory is designed to provide reproducible, high quality ATR spectra of materials that polarize light through the use of a variable-angle polarizer mount.
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Attenuated total reflectance (ATR) techniques offer a convenient alternative to thin-film, KBr pellet or diffuse reflectance measurements. The Universal ATR Accessory offers straightforward analysis of most sample types with a minimum of sample preparation. The polarization measurements additionally offered by the UATR Polarization Accessory give additional information on the molecular structure of a sample, particularly the crystal or molecular orientation.
With the UATR Polarization Accessory, the user is able to:
The UATR Polarization Accessory is designed for:
Features of the UATR Polarization Accessory include:
|Material||Diamond/ZnSe (1 Reflection)|
|Model Compatible With||Spectrum 65, Spectrum 400, Spectrum One, Spectrum 100|
|Product Group||UATR Polarization Accessory|
Attenuated total reflectance (ATR) techniques have been well established in FT-IR spectroscopy for many years. They offer a convenient alternative to th
In an ATR measurement IR radiation that is totally reflected produces an evanescent electric field beyond the surface of the crystal. The evanescent field has components in all directions but it is not uniform, with the result that ATR,spectra are sensitive to any anisotropy in the sample. Because of this relative band intensities may vary, depending on how the sample is presented. This has been exploited to measure the degree of orientation in surface films and,polymers. However it may also lead to unexpected changes when the possibility of anisotropy has not been considered.
In recent years ATR has become the preferred method for many routine IR measurements. The ,introduction of sampling accessories with small crystals greatly reduced the contact problem that ,had previously restricted the technique to liquids and soft solids while the hardness and chemical ,resistance of diamond has made ATR an almost universal sampling method. However solid samples ,require pressure to bring them into good contact with the ATR crystal. Increasing this pressure ,changes the relative intensities of bands at different wavelengths and may also induce structural ,changes. This note explains and illustrates the effects that occur.