First 165 words of the document:
Infrared spectroscopy is a technique used to determine the structure of organic compounds.
It helps chemists to identify different types of covalent bonds and hence draw conclusions
about the functional groups in a molecule.
How it works
In infrared spectroscopy, a beam of infrared radiation is passed through a sample of a
The infrared radiation is absorbed by the covalent bonds in the molecules, increasing their
Bonds between different atoms absorb different frequencies of infrared radiation.
Bonds in different places in a molecule absorb different frequencies too.
A typical IR Spectrum
IR spectra have the following features:
The x axis shows wavenumber, measured in cm -1
The y axis shows percentage transmittance
The absorption signal are downward troughs
Absorptions are described as strong, medium and hydrogen bonded
The part of the IR spectrum below 1500 cm -1 is called the fingerprint region