Patent ID: 6960533

Claim:
A method of processing a sample surface having a masking material and an anti-reflective film, said method performing surface processing of the sample surface using a plasma, comprising generating the plasma in a vacuum chamber; and applying a radio frequency bias to a sample table mounting the sample, wherein: said masking material and said anti-reflective film are made of a same organic group material, and said method of processing includes processing the same organic group material by steps of: introducing a mixed gas of (a) hydrogen gas and (b) any deposition gas, as an etching gas, into said vacuum chamber for said generating said plasma, wherein an amount of said deposition gas in said mixed gas, with said hydrogen gas, is set to a value, said value being an amount Eo at which a cut-down amount of said masking material becomes zero, and surface processing said sample surface, made of the same organic group material, by using said plasma.