Absorption of Radiation

Absorption of Radiation

1. Spectroscopy

   • Atoms
     • Single atom absorbs energy and excites
   • Molecules
     • Many electrons absorb
       • Typically electrons in bonds become excited
         • Leading to movement of electron or bond

2. Molecules absorb energy

   • Atoms rotate & vibrate
   • Bonds stretch
   • Different wavelengths
   • Simultaneous bond absorbance

3. Different energy (wavelengths)

   • Required depending on atoms and type of bond
     • These occur across any bond
       • Rotations
       • Vibrations
       • Stretching

4. Why

   • Element have different RAM
   • Bind with different strenths
   • Wavelength required differs
   • More enegery to move heavier atoms
     • Different wavelength absorbed