Patent ID: 6936310

Claim:
A plasma processing method comprising: supporting a substrate to be opposed to an electrode; setting a variable frequency of high frequency power f(Hz); providing a plasma processing gas, wherein said plasma processing gas is a mixture gas of an inert gas group and a reactant gas group, wherein said reactant gas group at least contains a gas including silicon atoms or a halogen base gas; setting a variable partial pressure of said reactant gas group P r (Torr); setting the plasma processing gas to pressure P(Torr) where P(Torr) satisfies the following relationship P L ( Torr )≦ P ( Torr )≦ P H ( Torr ) wherein the pressure P L (Torr) is a higher pressure of either one represented by the following relationship P L ( Torr )=5 ×P r ( Torr ) or P L ( Torr )=2×10 −7 ( Torr/HZ )× f ( HZ ) and the pressure P H (Torr) is a lower one of pressures represented by the following relationships P H ( Torr )=3.5× P L ( Torr ) and P H ( Torr )=500 ( Torr ); supplying high frequency power between the electrode and a holder to generate plasma between the electrode and the substrate on the basis of said plasma processing gas; and performing high rate plasma processing on the substrate utilizing the generated plasma.