IR Theory

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1. When does a molecule absorb IR radiation?

  • When the frequency of a vibration is equal to the frequency of the IR radiation directed on the molecule
  • When the bond is in the right position to absorb the radiation
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2. What type of transition can IR radiation excite?

  • Vibrational and Rotational
  • Vibrational
  • Rotatioanl

3. Name a use of IR spectroscopy

  • Identify functional groups
  • Analyse molecular weight

4. Can IR radiation excite electronic transitions?

  • Sometimes
  • No
  • Yes

5. Bond vibration energy is quantised. This means...

  • The bond vibrations are set values
  • The frequency and energy of a bond vibration is limited to a discreet value
  • The electrons move orbitals


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