Patent ID: 7754995

Claim:
A plasma processing apparatus, comprising: a vacuum processing chamber for plasma-processing an object in a closed treating space; an object-holding unit for disposing the object in the vacuum processing chamber; a plasma-generating unit that generates a plasma in the processing chamber and forms an oxide film, the plasma-generating unit comprising an antenna including a plane antenna member including a plurality of slots for guiding microwaves into the processing chamber; an evacuation unit that evacuates the processing chamber, a gas supply unit that supplies gas into the processing chamber; and the oxide film being formed on a surface of an inner wall comprising metal of the processing chamber, the oxide film being formed by introducing O 2 gas and H 2 containing gas from the gas supply unit and by generating, from the O 2 gas and H 2 gas, the plasma in the processing chamber, the plasma having a pressure of 3 to 100 Pa and a temperature of 50° C. to less than 400° C., said pressure and temperature being lower than a pressure and a temperature for plasma-processing the object, wherein a ratio (R a2 /R a1 ) of surface roughness R a2 after the oxide film is formed to surface roughness R a1 before the oxide film is formed, is not greater than 2.