Patent ID: 8928855
Filing Date: 2015-01-06
Classification: G03F

Abstract:
1. A lithographic apparatus comprising: a projection system constructed and arranged to project a beam of radiation onto a target portion of a substrate; an internal sensor having a sensing surface; and a mini-reactor movable with respect to the sensor, the mini-reactor comprising the mini-reactor being constructed and arranged to create a local mini-environment comprising hydrogen radicals substantially only to the sensing surface to treat the sensing surface, wherein the mini-reactor comprises a reactor chamber with a chamber opening, and wherein an internal surface of the reactor chamber comprises a first material that does substantially not react with hydrogen and hydrogen radicals, the first material having a hydrogen radical surface recombination coefficient of less than or equal to about 0.02, and wherein an external part of the mini-reactor comprises a second material having a hydrogen radical surface recombination coefficient of greater than about 0.02; and a cooling element constructed and arranged to cool at least part of the mini-reactor.