Patent ID: 7342715

Claim:
A multilayer film reflector for soft X-rays comprising: a substrate; a plurality of layers alternately stacked on the substrate comprising a high refractive index layer with an amorphous structure having a relatively high refractive index and a low refractive index layer with a crystalline structure having a relatively low refractive index; and an intermediate layer having the same crystalline structure as that of the low refractive index layer and disposed at at least one of interfaces on a side opposite to the substrate side of the high refractive index layer, between the high refractive index layer and the low refractive index layer, wherein the intermediate layer comprises a metal, alloy, or compound comprising at least one element selected from the group consisting of V, Nb, Zr, Be, Mg, Ti, Zn, Ag, Al, Au, Ca, Cu, Ni, Pb, Pt, Ba, Cr, Fe, and W.