Patent ID: 7004107

Claim:
A substrate processing system comprising: a deposition chamber comprising a reaction zone; a substrate holder that positions a substrate in the reaction zone; said substrate holder comprising a low frequency (LF) electrode; a gas distribution system that includes a gas inlet manifold for supplying one or more process gases to said reaction zone; said gas inlet manifold comprising a high frequency (HF) electrode; a plasma power source for forming a plasma within the reaction zone of said deposition chamber, the plasma power source comprising a high frequency power supply coupled with the HF electrode and a low frequency power supply coupled with the LF electrode; an impedance monitor comprising a first impedance probe electrically coupled to said high frequency electrode to measure the impedance at the HF electrode and a second impedance probe electrically coupled to said low frequency electrode to measure the impedance at the LF electrode; and a processor coupled with the impedance monitor for adjusting processing conditions of the deposition chamber based on measurements by the first impedance probe and the second impedance probe.