Patent ID: 7252716

Claim:
A gas injection apparatus for injecting a reactive gas into a reaction chamber of a semiconductor processing system, the apparatus comprising: an injector disposed to contact an inner surface of a wall of the reaction chamber of the semiconductor processing system, the injector having a plurality of nozzles penetrating it, through which the reactive gas is injected into the reaction chamber; a gas inlet penetrating through the wall of the reaction chamber; a manifold disposed between the wall of the reaction chamber and the injector, for supplying the reactive gas flowing through the gas inlet to each of the plurality of nozzles; and bifurcating gas channels arranged on at least two levels in the manifold, the at least two levels equalizing lengths of gas paths connecting the gas inlet to the plurality of nozzles, wherein all surfaces defining the gas channels have a full extent defined by a surface of the injector and a surface of the reaction chamber.