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Last year PIKE introduced
new ZnSe and Ge multiplereflection ATR plates. In order to increase the number of reflections, the new plates measure 80 mm long and 2 mm thick (45 degree angle of incidence) to complement our standard 80 x 4 mm configuration.
Q: How many reflections are achieved with our new 80 x 2 mm crystal?
Hint: Let our FTIR Calculator do the work for you (ATR Calculations):Calculate Now
The PIKE Team wishes our University friends a happy and productive school year!
Dear Friend,
In the past few months we have been concentrating on improving the content and quality of our website. The goal of this effort is to make it easier for you and other customers to get quick and reliable assistance with their applications, locate needed products, find details related to spectroscopy techniques, and instructions on how to use our accessories. We are using a number of approaches to achieve that - including a sophisticated search routine that produces a specific list of relevant products with clear descriptions and PDF product sheets, a wide range of application notes, and just started, a range of product and application videos.
As of this issue, there are even more popular products available for direct purchase on our website (please see more details below). We plan to keep adding to this range as we move forward. We hope you find these changes useful and productive. Please let us know if you have any special requests or ideas in this area - we are open to suggestions. And please visit www.piketech.com often.
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Our premier stock window and crystal materials are a carefully selected range of IR transparent materials most often used by IR spectroscopists. All windows, crystals and powders are made from the best quality material. They fit PIKE accessories, and cell holders available from other vendors.
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Expanded Spectral Range Germanium ATR Crystal
Experimental data show the crystal dimensions of an ATR-FTIR sampling accessory influences the usable spectral range. An expanded range germanium crystal is introduced for the measurement of high refractive index samples.
Attenuated total reflection (ATR) for FTIR sampling requires that the beam angle of incidence (AOI) is greater than the critical angle, which is defined as where n2 and n1 are the refractive index of the sample and ATR crystal, respectively.1 For high refractive index materials a germanium crystal is often necessary to reduce the critical angle to below 45o, the most common AOI for single reflection ATRs. Violating the critical angle results prohibits total internal reflection which in turn results in a shift in the baseline from 100% transmission and often derivative shaped absorbance bands (Fig. 1).
Figure 1. IR spectrum of a high refractive index material (malachite green oxalate) collected using a diamond ATR; Derivative-shaped bands and baseline shift are a result of violating the ATR critical angle.
The spectral range of ATR crystals, which is a function of the crystal type and geometry, is one consideration when choosing an ATR accessory. This application note investigates the spectral cut-off of Ge ATR accessories, and discusses the benefits of an expanded range Ge crystal for certain samples.