1. 
   photo-ionization
   the interaction of electromagnetic radiation with matter resulting in the dissociation of that matter into electrically charged particles. The ... [8 related articles]
   Found op http://www.britannica.com/eb/a-z/p/60
   
   
2. 
   photo-ionization
   ionization of atoms or molecules due to the action of electromagnetic radiation such as ultraviolet radiation or X-rays
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-06-03
   
   
3. 
   photoionization
   The ionization of an atom or molecule by the absorption of a high-energy photon. It is an important source of opacity in stars.
   Found op http://www.daviddarling.info/encyclopedia/P/photoionization.html
   
   

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