Showing posts with label FTIR. Show all posts
Showing posts with label FTIR. Show all posts

Monday, 23 June 2014

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.
Please visit other articles on this blog to know more about this topic:
Recommended Articles : Advantages and disadvantages of FTIR 
Some more information about: What is FTIR    

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.

To know more about this topic please visit other articles on this blog:
Recommended article: What is FTIR