- Infrared spectroscopy involves studying the interaction of infrared radiation on atoms
- When a sample of an organic compound is subjected to infrared radiation the
compounds absorbs some of this energy.
- As energy at certain wavelengths is absorbed a detector can be used to record the
decrease in intensity of the radiation as it passes through the sample.
- An absorption spectrum is produced showing the percentage transmittance versus the
- A 95% transmittance means that most radiation at a particular frequency passed
straight through the sample.
- A 5% transmittance means that nearly all the radiation at a particular frequency was
absorbed by the sample.
- The amount of absorption or transmittance of infrared radiation provides information
about the bonds in the sample.
- If a particular frequency is being absorbed as it passes through a sample then it must
mean that its energy is being transferred to the compound.
- The energies specific to infrared radiation correspond to the energies involved in bond
vibrations such as bond stretching or bond bending.
- When the frequency of