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PLC-11M Single Reflection Prism Cell
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PLC-11M Single Reflection Prism Cell

Price per Unit (piece): $1,950.00

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The Prism Cell is primarily used for analyzing highly absorbing materials, typically
aqueous samples, pastes, films and soluble powders.  The accessory utilizes a
45° single reflecting prism (permanently mounted Zinc Selenide or Germanium
prism) and a two-mirror transfer optic design for high performance.  The two-
mirror transfer optical design means easy alignment.  The accessory is slide
mounted to fit into the sample holder of the instrument


Single Reflection Prism Cell includes:
Transfer optic
One Single Reflection ZnSe prism (45°)
Flow-through plate
Pressure plate

Infrared Spectroscopy (IR) is one of the most descriptive
“tools” available to the analytical organic chemist both for
qualitative identification and quantitative determination of
single and mixed components. Classically, most samples have
been prepared for scanning by transmission, where the thickness
becomes a very critical factor in the quality of the final spectrum. If the
sample is too thick, it is common to lose bands from over absorption.
If the sample is too thin, noise generally overlaps the actual sample
peaks.

The material typically used in IR work is based on hydroscopic
salts, such as NaCl and KBr, which require that the sample be absolutely
dry or the sample will fog the salt and ruin the data.  The applications
group and design engineers at Buck have perfected the use of an
accessory called the Single Reflection Prism Cell to eliminate virtually
all of the problems previously encountered in IR sample preparation.

This device uses an inert Zinc Selenide crystal (ZnSe) that is impervious
to dilute acids & alkalis briefly, and all solvents. A prism of this material
is placed over a simple mirrored holder that directs the IR energy up
to one angled face of the prism, which then directs the beam up to
the horizontal face of the crystal.  Anything in contact with the face
of the crystal will absorb some of the IR beam’s energy by the process
known as Attenuated Total Reflection (ATR). This in turn generates
and absorbance spectrum.  For single beam instruments, like the
Buck M530, a background reference scan is first made of the clean,
empty crystal.  The sample is then deposited on the surface as a cast
film from a solvent or smear, or simply placed on top. A sample scan
is made, and the 2 scans are ratioed to create a typical IR spectrum.
After the scan is completed, the ZnSe crystal is quickly rinsed off
with water or solvent, dried with a clean tissue, and then replaced
for the next sample. 

The ease-of-use, the data precision, and the
rapid throughput of sample runs make the PLC-11M an ideal tool for
the QC environment, the research lab, and for the beginner.



Figure 1 shows how simple and efficient the Buck Prism Cell works.



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