Table of Contents
What is the use of ATR in FTIR?
ATR is one of the most used sampling technologies for FTIR Spectroscopy. The reason for the ubiquitous use of ATR is that it enables solids and liquid samples to be analyzed neat – simplifying the measurement of virtually all substances.
What ATR stands for in spectroscopy?
1 Attenuated Total Reflectance (ATR) ATR is a contact sampling method that involves a crystal with a high refractive index and excellent IR transmitting properties. ATR is one of the more popular sampling techniques used by FT-IR Spectroscopists because it is quick, non-destructive and requires no sample preparation.
What is difference between FTIR and IR?
The major difference between an FTIR spectrometer and a dispersive IR spectrometer is the Michelson interferometer.
What is the difference between KBr and ATR?
However, the KBr disc method gives greater resolution than the ATR. You’ll also find that the ATR method gives a lot of interference below 600 wavenumbers, which results in it only being practical to measure down to 650 cm-1, whereas with the KBr disc method one can go down to 450 cm-1.
Why is potassium bromide used in FTIR?
KBr is used as a carrier for the sample in IR spectrum and it is optically transparent for the light in the range of IR measurement. So that no interference in absorbence would occur. KBr, has a transmittance of 100 % in the range of wave number (4000-400 cm-1). Therefore, it does not exhibit absorption in this range .
Why KBr is used in FTIR spectroscopy?
KBr is used as a carrier for the sample in IR spectrum and it is optically transparent for the light in the range of IR measurement. So that no interference in absorbence would occur. KBr, has a transmittance of 100 % in the range of wave number (4000-400 cm-1).
Why is nacl used in IR spectroscopy?
Sodium chloride is chosen because it is transparent to infrared radiation. These plates – called “salt plates” – are rather expensive because each plate is cut from a single giant crystal; they are very fragile and sensitive to moisture, including the moisture in your fingers.