KBr (potassium bromide) is a material commonly used to make pellets, especially for applications in infrared spectroscopy.
Why KBr is Used to Make Pellets for Infrared Spectroscopy? 4 Key Reasons
1. Transparency in Infrared Spectroscopy
KBr is highly transparent in the infrared (IR) region of the electromagnetic spectrum.
This transparency is crucial for IR spectroscopy.
It allows IR radiation to pass through the pellet, enabling the detection of absorption bands that correspond to the molecular structure of the sample.
2. Formation of Clear Pellets
KBr is mixed with the sample material to form a homogeneous mixture.
The clarity of the resulting KBr pellet is essential for accurate spectral readings.
Typically, the mixture consists of 200-300 mg of KBr and 1 mg of the sample.
Using an evacuable pellet die ensures that the pellet is free from air bubbles and other imperfections that could interfere with the spectral analysis.
3. Compatibility with Pellet Press Mechanics
The KBr pellet press is designed to apply a high compressive force to the KBr-sample mixture.
This forms it into a cylindrical pellet with flat ends.
The mechanical advantage of the press, which can reach up to 50 to 1, allows for the application of sufficient force to create firm pellets from powdered materials without the need for additional binders.
The dies used in the press are not fastened down, allowing for quick reloading and efficient production of pellets.
4. Advantages Over Other Techniques
KBr pellet formation offers advantages over newer techniques such as Attenuated Total Reflectance (ATR) spectroscopy.
One key advantage is the ability to adjust the pathlength of the compound of interest.
This can provide more detailed information about the sample's molecular structure.
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