Patent ID: 7088431
Filing Date: 2006-08-08
Classification: G03F,H01L

Abstract:
1. A lithographic apparatus comprising. an illumination system constructed to provide a beam of radiation; an article support constructed to support an article to be placed in a beam path of said beam of radiation on said article support; an electrostatic clamp to clamp said article against said article support by an electrostatic field during projection; protrusions to support said article; and a recessed backfill gas feed arranged in said article support to provide backfill gas to a backside of said article when said article is supported by said article support, said recessed backfill gas feed includes a channel to transport said backfill gas over a supporting area of said article support, said channel including a shielding layer to shield said backfill gas in said recessed backfill gas feed from said electrostatic field.