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An apparatus for processing a substrate with a plasma. The apparatus includes first and second electrodes positioned with a spaced apart relationship. A separating ring has a vacuum-tight engagement with confronting surfaces of the first electrode and the second electrode to define an evacuatable pr

An apparatus for processing a substrate with a plasma. The apparatus includes first and second electrodes positioned with a spaced apart relationship. A separating ring has a vacuum-tight engagement with confronting surfaces of the first electrode and the second electrode to define an evacuatable processing region therebetween. Communicating with the processing region is a process gas port for introducing a process gas to the processing region. The processing region may be evacuated through a vacuum port defined in one of the first and second electrodes to a pressure suitable for exciting a plasma from the process gas in the processing region when the first and second electrodes are powered.

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We claim: 1. An apparatus for processing a substrate with a plasma, the apparatus comprising: a first electrode; a second electrode; a separating member directly contacting said first electrode and directly contacting said second electrode and forming a sidewall extending from said first electrode

We claim: 1. An apparatus for processing a substrate with a plasma, the apparatus comprising: a first electrode; a second electrode; a separating member directly contacting said first electrode and directly contacting said second electrode and forming a sidewall extending from said first electrode to said second electrode, said separating member composed of a dielectric material capable of electrically isolating said first electrode from said second electrode; a processing region formed by said separating member, said first electrode, and said second electrode; a process gas port for introducing a process gas to said processing region; a vacuum port in said first electrode for evacuating said processing region to a sub-atmospheric pressure suitable for generating the plasma from the process gas in said processing region; an electrically conductive shell surrounding said first electrode, said second electrode, and said separating member; and an atmospheric pressure space between said shell and said first electrode, said second electrode, and said separating member. 2. The apparatus of claim 1 further comprising: a vacuum manifold coupled with said vacuum port, said vacuum manifold being electrically isolated from said first electrode and said second electrode. 3. The apparatus of claim 2 wherein said vacuum manifold includes an enclosed volume proximate to said vacuum port and further comprising: an insert of an electrically insulating material positioned inside said enclosed volume, said insert including a first plurality of passages coupling said vacuum manifold with said vacuum port. 4. The apparatus of claim 3 wherein said vacuum port is defined by a second plurality of passages extending through said first electrode and registered with said first plurality of passages. 5. The apparatus of claim 1 further comprising: a vacuum pump coupled with said vacuum port and operative for evacuating said processing region to said pressure suitable for generating the plasma from the process gas in said processing region. 6. The apparatus of claim 1 further comprising: a process gas supply coupled with said process gas port for introducing the process gas to said processing region. 7. The apparatus of claim 1 wherein said second electrode includes a plurality of openings arranged in a pattern effective for communicating process gas from said process gas port to said processing region. 8. The apparatus of claim 1 wherein said shell includes a base and a lid movable relative to said lid between opened and closed positions for accessing said processing region, said lid carrying said second electrode for movement relative to said base. 9. The apparatus of claim 1 further comprising a coolant port in said lid configured for supplying a flow of a coolant fluid to said atmospheric pressure space for cooling said first electrode and said second electrode. 10. The apparatus of claim 1 wherein said second electrode includes said process gas port. 11. The apparatus of claim 10 wherein said second electrode includes a plurality of gas openings coupled with said process gas port, said plurality of gas openings positioned in said second electrode to distribute process gas across a confronting surface of the substrate. 12. An apparatus for plasma processing a plurality of substrates, the apparatus comprising: a first electrode; a second electrode positioned with a spaced apart relationship relative to said first electrode; a third electrode positioned between said first electrode and said second electrode; a first separating member directly contacting said first electrode and directly contacting said third electrode forming a first sidewall extending between said first electrode and said third electrode, said first electrode configured to support one of the plurality of substrates in said first processing region for plasma processing, and said first separating member comprising a dielectric material for electrically isolating said first electrode from said third electrode; a first processing region formed by said first separating member, said first electrode, and said third electrode; a second separating member directly contacting said second electrode and directly contacting said third electrode forming a second sidewall extending between said second electrode and said third electrode, said second electrode configured to support one of the plurality of substrates in said second processing region for plasma processing, and said second separating member comprising a dielectric material for electrically isolating said second electrode from said third electrode; a second processing region formed by said second separating member, said second electrode, and said third electrode; at least one process gas port for introducing a process gas to said first processing region and second processing region; a vacuum port in said first electrode for evacuating said first and second processing regions to a sub-atmospheric pressure suitable for generating the plasma from the process gas in said first processing region and said second processing region; an electrically conductive shell surrounding said first electrode, said second electrode, said third electrode, said first separating member, and said second separating member; and an atmospheric pressure space between said shell and said first electrode, said second electrode, said third electrode, said first separating member, and said second separating member. 13. The apparatus of claim 12 wherein said second electrode includes a first process gas port configured for introducing the process gas to said first processing region and said third electrode includes a second process gas port configured for introducing the process gas to said second processing region. 14. The apparatus of claim 1 wherein said first electrode is adapted to support the substrate in said processing region.