Patent ID: 7459708

Claim:
Extreme UV radiation source device, comprising: a vessel for forming high density and high temperature plasma; a raw material supply means which supplies a raw material which contains at least one of tin and a tin compound to the vessel as an extreme UV radiating fuel; a heating/excitation means for heating and exciting the raw material supplied to the vessel to produce high density and high temperature plasma; an evacuation means which is connected to the vessel; an exit part for extreme UV radiation from which the extreme UV radiation which has been emitted by the high density and high temperature plasma emerges, and a means for feeding hydrogen radicals provided in the vessel, wherein said means for feeding hydrogen radicals includes a radical producing part which is arranged such that the emission direction of the hydrogen radicals which have been emitted by the radical producing part crosses an outlet flow containing debris including tin and/or a tin compound which is formed in the extreme UV radiation source device.