Patent ID: 9746782
Date: 2017-08-29
CPC Classifications: G03F

Claim:
1. A system, comprising: a movable table; a projection system configured to project a beam of radiation onto a substrate, the projection system comprising an optical element nearest the table; a fluid handling system configured to confine immersion liquid to a localized liquid space between the element of the projection system and the table, the fluid handling system comprising a liquid confinement structure arranged to define a gap between a bounding surface of the liquid confinement structure and an opposing surface; a gas supply device configured to supply gas from a gas source to a region adjacent the liquid space, the gas having a solubility in the immersion liquid of greater than 5×10 a second orifice configured to supply a fluid different than the gas, the second orifice located outward, relative to the localized liquid space, of the first orifice and facing the opposing surface, and the second orifice is separated from the first orifice by a recess or open gap that is open to the atmosphere.