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  Spectroscopy Introduction: In this chapter we are going to consider how the different types of radiation affect molecules and how this relation can be used.  Electromagnetic spectrum Unlike water waves oscillations of electromagnetic waves involve not matter but electric and magnetic field.  Electromagnetic spectrum ã Electromagnetic waves can cover a wide range of wavelengths or frequencies. ã Due to infrared radiation  bonds in the molecules vibrate by stretching and bending. ã Different bonds require different amounts of energy to make them vibrate. Only the polar molecules are affected due to this type of radiation. H  –  H and Cl  –  Cl will not absorb infrared radiation, but H  –  Cl will.  Electromagnetic spectrum
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