Patent ID: 6366346
Filing Date: 2002-04-02
Classification: C23C,H01J

Abstract:
A method for controlling a process parameter of a substrate processing system, the method comprising steps of:(a) flowing a gas into a processing chamber, the process parameter being at a first value; (b) evacuating effluents from the processing chamber; (c) flowing the effluents through a plasma cell comprising a cathode having a first portion and a second portion, wherein said flow of effluents through said plasma cell is transverse to said first portion of said cathode and substantially parallel to said second portion of said cathode; (d) forming a plasma in the plasma cell from the effluents by applying energy to the cathode; (e) detecting photo emissions of a selected wavelength from the plasma; and (f) changing the process parameter to a second value in response to a change in the photo emissions.