The range of KBr in IR is from wave number 4000-400 cm-1.
In this range, KBr has a transmittance of 100% and does not exhibit absorption.
KBr is optically transparent for light in the range of IR measurement, which means that it does not interfere with the absorbance of the sample.
KBr is commonly used as a carrier for the sample in IR spectroscopy because it allows the IR radiation to pass through it without interference.
It is often mixed with the sample in a ratio of 0.2 to 1 percent.
The concentration of the sample in KBr should be lower than in liquid films because the pellet is thicker and a higher concentration can cause difficulties in obtaining clear spectra.
What is the range of KBr in IR? (7 Key Points)
1. Optically Transparent Range
The range of KBr in IR is from wave number 4000-400 cm-1.
2. Transmittance and Absorption
In this range, KBr has a transmittance of 100% and does not exhibit absorption.
3. Optical Transparency
KBr is optically transparent for light in the range of IR measurement, which means that it does not interfere with the absorbance of the sample.
4. Common Use in IR Spectroscopy
KBr is commonly used as a carrier for the sample in IR spectroscopy because it allows the IR radiation to pass through it without interference.
5. Mixing Ratio
It is often mixed with the sample in a ratio of 0.2 to 1 percent.
6. Sample Concentration
The concentration of the sample in KBr should be lower than in liquid films because the pellet is thicker and a higher concentration can cause difficulties in obtaining clear spectra.
7. Preparation of KBr Pellets
The preparation of KBr pellets involves mixing the KBr powder with the sample, grinding them together to form a fine powder, and then pressing them into a disc using a pellet die.
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