Patent ID: 8562794

Claim:
A process for producing a substrate with a reflective layer for EUV lithography, comprising: alternately forming a Mo film and a Si film on a substrate such that a Mo/Si multilayer reflective film is formed on the substrate; applying roughening treatment to a non-erosion region of a Ru or Ru compound sputtering target for formation of a protective layer comprising a Ru film or Ru compound film such that the non-erosion region of the Ru or Ru compound sputtering target has a surface roughness Ra of at least 7.5 μm; and forming the protective layer comprising the Ru film or Ru compound film on the Mo/Si multilayer reflective film, wherein the forming of the Mo/Si multilayer reflective film and the forming of the protective layer are carried out in the same deposition chamber by an ion beam sputtering method, the non-erosion region and an erosion region of the Ru or Ru compound sputtering target for the formation of the protective layer are predicted based on an erosion region of a Si sputtering target for formation of the Si film, the formation of the Si film and the formation of the protective film are carried out with the same type of process gas, and the formation of the protective layer includes adjusting a target angle, a process gas pressure, an RF power of ion source, a suppresser voltage, an ion beam voltage and an ion beam current to be at most ±5% in variation based on a target angle, a process gas pressure, an RF power of ion source, a suppresser voltage, an ion beam voltage and an ion beam current in the formation of the Si film and the sum of the absolute values in the variation to be at most 10%.