Patent ID: 8157952

Claim:
A plasma processing chamber having a vessel housing a substrate, and at least one electrode that is disposed in said vessel and is connected to a radio frequency power source, wherein at least two types of plasma processing can be carried out on the substrate using plasma produced from a processing gas introduced into said vessel, the plasma processing chamber further comprising: a processing chamber component element that is disposed in said vessel and exposed to the plasma; and a potential controlling apparatus that sets a potential of said processing chamber component element to either a floating potential or a ground potential in accordance with which of the at least two types of plasma processing is carried out, wherein said processing chamber component element is electrically floating, and said potential controlling apparatus has at least one electrically grounded component element contacting member, said at least one component element contacting member being movable to either engage or disengage said processing chamber component element in accordance with which of the at least two types of plasma processing is carried out, wherein said processing chamber component element has at least one recess-like hole therein, and said at least one component element contacting member has a projecting portion that is engageable with said at least one recess-like hole, and wherein said at least one recess-like hole has a narrow portion therein, and at least one of said narrow portion and said projecting portion includes an elastic member.