Patent ID: 8021514

Claim:
A plasma processing chamber, comprising: a vacuum chamber; a pedestal disposed in the vacuum chamber for supporting a substrate to be processed; a showerhead in opposition to the pedestal and including a gas manifold and a plurality of apertures through a face plate and between an interior of the gas manifold and an interior of the vacuum chamber; a plasma generating unit; an inlet tube connected between an output of the plasma generating unit and the manifold; an ion filter operatively associated with the inlet tube, including magnets projecting a magnetic field across an interior of the inlet tube, and operating to remove ions from a plasma passing from outlet of the plasma generating unit through the inlet tube and to pass neutral radicals in the plasma; a source of oxygen gas selectively connectable to the plasma generating unit; a source of water vapor comprising an ampoule containing water mounted on the vacuum chamber and selectively connectable to the plasma generating unit; and a source of hydrogen gas selectively connectable to the plasma generating unit.