How many types of FTIR are there?

There are four major sampling techniques in FTIR: Transmission. Attenuated Total Reflection (ATR) Specular Reflection.

What is FTIR microspectroscopy?

FTIR microspectroscopy is a non-invasive and label-free tool that requires a very limited amount of material and allows obtaining a biochemical fingerprint of the sample under investigation, providing information on the content and structure of its main biomolecules, as well as on their chemical modifications6,7.

What is difference between FTIR and FTIR ATR?

All Answers (15) FTIR is any Fourier Transform Infrared spectroscopy method in any measuring geometry, may it be transmission, reflection or whatever. ATR stands for attenuated total reflection and is developed in order to enhance the surface sensitivity since IR spectroscopy is a bulk method.

Which lamp is used in FTIR spectroscopy?

IR sources Shorter wavelengths of the near-IR, 1−2.5 μm (10,000–4,000 cm−1), require a higher temperature source, typically a tungsten-halogen lamp.

How are FTIR samples prepared?

Add about 1 to 2 % of your sample, mix and grind to a fine powder. For very hard samples, add the sample first, grind, add KBr and then grind again. The sample must be very finely ground as in the Nujol mulling technique to reduce scattering losses and absorption band distortions.

What are the disadvantages of FTIR?

The sampling chamber of an FTIR can present some limitations due to its relatively small size. Mounted pieces can obstruct the IR beam. Usually, only small items as rings can be tested. Several materials completely absorb Infrared radiation; consequently, it may be impossible to get a reliable result.

Why Diamond Crystal is best choice for ATR?

diamond as a good ATR crystal. The high load bearing capacity of diamond allows for (near) perfect optical contact between the sample and diamond and results in good spectra of even the most intractable of sample types.

What is the use of ATR in FTIR?

Attenuated total reflection (ATR) is a sampling technique used in conjunction with infrared spectroscopy which enables samples to be examined directly in the solid or liquid state without further preparation.