Patent ID: 7701551

Claim:
A lithographic apparatus, the apparatus comprising: a projection system configured to project an image of a desired pattern through a liquid onto an image field; a substrate table configured to hold a substrate so that a target portion on the substrate is positionable in the image field; a barrier member configured to surround a space between the projection system and the substrate, the substrate table, or both the substrate and the substrate table, the barrier member configured to at least partly confine liquid to the space and having a surface facing the substrate, the substrate table, or both the substrate and the substrate table, so as to define a gap between the barrier member and the substrate, the substrate table, or both the substrate and the substrate table; a nozzle for connection to a source of liquid, the nozzle shaped and oriented to direct a jet of liquid into the gap and substantially towards the center of the image field so as to confine radially inward of the nozzle substantially all liquid at the nozzle; and a liquid supply connected to the nozzle and arranged to supply liquid to the nozzle at a pressure such that a rate of momentum transfer from the jet to the liquid confined in the space is sufficient to prevent liquid flowing away from the space, escaping through the gap.