Radiation Source, Lithographic Apparatus and Device Manufacturing Method

摘要

A radiation source generates extreme ultraviolet radiation for a lithographic apparatus as a chamber that is provided with a low pressure hydrogen environment. A trace amount of a protective compound, e.g., H2O, H2O2, O2, NH3 or NOx, is provided to the chamber to assist in maintaining a protective oxide film on metal, e.g., titanium, components in the chamber.