Improvements in or relating to the production of thin films

摘要

In order to relieve stresses in a thin film supported on a fragile substrate caused by contraction of the film relative to the substrate, the film is subjected to electron bombardment either during or after the cooling which results in its contraction. The method may be applied to film-type dynodes of the type comprising an evaporated film of potassium chloride deposited on an electron-transparent substrate of aluminium oxide supported by an annular glass frame.