Principle of FTIR Spectroscopy

Basic principle of FTIR Spectroscopy are as follows:-

• FTIR spectroscopy is used to identify the functional group which is present in certain molecules.
• FTIR is one of the widely used method which is also know as Fourier Transform Infrared Spectroscopy.
• In this method of infrared spectroscopy , radiation (Infra red) is passed through the sample.
• Some of the radiation is absorbed by the sample while some of the radiation is transmitted.
• Now spectrum which is produced , represents molecular transmission and molecular absorption creating molecular fingerprint of a sample.
• The fingerprint region is unique for also samples, no two samples have same fingerprint region.
• The fingerprint region shows different absorption peaks with different vibration frequency between bonds of an atoms in the sample.
• Hence with this property unique molecule can be identified.

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Advantages and Disadvantages of FTIR Spectroscopy

Advantages of FTIR are:-

• FTIR stands for Fourier Transform Infrared Spectroscopy is highly sensitive and quick method to achieve high quality spectrum.
• This spectroscopy gives better signal to noise ratio compared to the dispersive instrument.
• With FTIR, spectrum can be obtained very quickly and saves time.
• Gases, solids as well as liquid can be analysed with FTIR.
• By using FTIR no external calibration is required and gives accurate results.
• FTIR is non-destructive technique.
• Organic compounds and Inorganic compounds can be identified easily using fourier transform infrared spectroscopy.
• Mechanical breakdown is less compared to other instruments because the mirror which is attached in the interferometer is the only moving part in FTIR.
• Simultaneous analysis can be done for multiple gaseous compounds.
• FTIR can identify even small concentrations of contaminants.
• FTIR has a laser beam which keeps the FTIR instrument accurately calibrated.
• It generally completes a scans within 1 to 2 seconds.
• High resolution.

Disadvantages of FTIR are:-

• FTIR instrument have only single beam while , dispersive instrument generally have a double beam.

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FTIR PRINCIPLE

WHAT IS FTIR | FOURIER TRANSFORM INFRARED SPECTROSCOPY