Continuous thin diamond film and method for making same

摘要

A continuous thin diamond film having a thickness of less than about 2 microns has a permeability to helium lower than about 1x10-6 standard cubic centimeters of helium per second per square millimeter of surface area. The thin diamond film may be supported on a supporting grid and may be incorporated into an x-ray window. The thin diamond film of the present invention may be formed in a two-stage growth process wherein a first stage a carbonaceous gas at a first concentration is introduced in to the reactor and in a second stage the concentration of the carbonaceous gas is reduced to a second lower concentration.