Patent ID: 8025777

Claim:
A process for the deposition of films on substrates, comprising: a step of sputtering or magnetron sputtering of one layer of Mo or Si on another layer underlying said one layer of Mo or Si or on a substrate for the fabrication of a reflective Mo/Si multilayer system for the extreme ultraviolet wavelength range, wherein a distance between a target and a substrate is larger than 25 cm, and wherein during said sputtering of said one layer a working gas pressure is regulated in a first step to a first pressure value and is decreased in one subsequent step to a second pressure value lower than the first pressure value, so that for the first pressure value the mean free path of particles is smaller than the distance between the target and the substrate and for the second pressure value the mean free path of particles is larger than the distance between the target and the substrate, leading to a suppression of intermixing between said one layer and said another layer or said substrate for the first pressure value and enabling to control the growing film's roughness of said one layer for the second pressure value.