Patent ID: 7088421

Claim:
A lithographic projection apparatus, comprising: a radiation system configured to provide a beam of radiation, the beam being patterned by a patterning device; a substrate table configure to hold a substrate; a projection system configured to project the patterned beam onto a target portion of the substrate; a processing unit configured to process the substrate at least one of before and after the substrate has been exposed to the beam of radiation; a transport unit configured to transport the substrate between the substrate table and the processing unit; and a contamination control device configured to control the partial pressure of H 2 O in the transport unit to be less than 1×10 −2 mbar, the partial pressure of hydrocarbons in the transport unit to be less than 1×10 −4 mbar, and the partial pressure of amine bases in the transport unit to be less than 1×10 −6 mbar.