Infrared spectroscopy

• Electromagnetic waves consist of electric and magnetic field which are perpendicular to each other
• Global Warming

  Greenhouse gases include carbon dioxide, water vapour, methane, and all other atmospheric gases containing atmospheric gases containing C=O , O-H and C-H bonds.

  The bonds within molecules of these greenhouse gases absorb infrared radiation. This increases their kinetic energy causing the gases to heat up. As a result the temperature of the atmosphere increases, which in turn warms the earth.
• Frequency depends on mass of atoms in the bond, the bond strength and the type of vibration
• Wavenumber = 1/wavelength so units is cm^-1
• Below 1500cm^-1 is used for fingerprinting is used to tell if a substance is pure or not and can be used to identify a compound