Described are a method and apparatus for evaluating a least one characteristic of a plasma. The described method uses photons to raise the excitation state to or past the point of ionization of atoms which will traverse the plasma to be evaluated. The ionization of the atoms, followed by the measurement...http://www.google.es/patents/US7982187?utm_source=gb-gplus-sharePatente US7982187 - Method and apparatus for photon-assisted evaluation of a plasma
Method and apparatus for photon-assisted evaluation of a plasma
