Patent ID: 8702901

Claim:
An apparatus for manufacturing a reflective mask configured to form a pattern region and a light blocking region surrounding the pattern region in a mask blank including an anti-reflection layer including an oxide of tantalum, an absorber layer including a nitride of tantalum, and a reflection layer including a layer including molybdenum and a layer including silicon, the apparatus comprising: a third processing unit including: a third processing chamber; a third gate valve configured to close a third carry-in/out port provided at the third processing chamber; a third supply unit configured to supply a third gas or a fourth gas into the third processing chamber; a third exhaust unit configured to exhaust an interior of the third processing chamber; and a third plasma generation unit configured to generate plasma in the third processing chamber, the third processing unit being configured to perform etching processing on the reflection layer in the third processing chamber, the third supply unit being configured to supply the third gas containing chlorine and oxygen in performing etching processing on the reflection layer, the third supply unit supplying the third gas with an additive amount of the oxygen of not less than 5 vol% and not more than 30 vol%.