AA-IR-UV/VIS-HPLC-GC Accessories & Supplies Infrared Accessories & Instrument Spares Attenuated Total Reflectance (ATR) Attenuated total reflectance accessory (PLC-11M)
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PLC-11M Single Reflection Prism Cell
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The Prism Cell is primarily used for analyzing highly absorbing materials, typicallyaqueous samples, pastes, films and soluble powders. The accessory utilizes a45° single reflecting prism (permanently mounted Zinc Selenide or Germaniumprism) and a two-mirror transfer optic design for high performance. The two-mirror transfer optical design means easy alignment. The accessory is slidemounted to fit into the sample holder of the instrument
Infrared Spectroscopy (IR) is one of the most descriptive“tools” available to the analytical organic chemist both forqualitative identification and quantitative determination ofsingle and mixed components. Classically, most samples havebeen prepared for scanning by transmission, where the thicknessbecomes a very critical factor in the quality of the final spectrum. If thesample is too thick, it is common to lose bands from over absorption.If the sample is too thin, noise generally overlaps the actual samplepeaks.
The material typically used in IR work is based on hydroscopicsalts, such as NaCl and KBr, which require that the sample be absolutelydry or the sample will fog the salt and ruin the data. The applicationsgroup and design engineers at Buck have perfected the use of anaccessory called the Single Reflection Prism Cell to eliminate virtuallyall of the problems previously encountered in IR sample preparation.
This device uses an inert Zinc Selenide crystal (ZnSe) that is imperviousto dilute acids & alkalis briefly, and all solvents. A prism of this materialis placed over a simple mirrored holder that directs the IR energy upto one angled face of the prism, which then directs the beam up tothe horizontal face of the crystal. Anything in contact with the faceof the crystal will absorb some of the IR beam’s energy by the processknown as Attenuated Total Reflection (ATR). This in turn generatesand absorbance spectrum. For single beam instruments, like theBuck M530, a background reference scan is first made of the clean,empty crystal. The sample is then deposited on the surface as a castfilm from a solvent or smear, or simply placed on top. A sample scanis made, and the 2 scans are ratioed to create a typical IR spectrum.After the scan is completed, the ZnSe crystal is quickly rinsed offwith water or solvent, dried with a clean tissue, and then replacedfor the next sample.
The ease-of-use, the data precision, and therapid throughput of sample runs make the PLC-11M an ideal tool forthe QC environment, the research lab, and for the beginner.
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