Secondary-ion mass spectrometry (SIMS) analysis of electron-bombarded soda-lime-silica glass

Abstract
Al‐coated glasses of molar composition 20Na2O‐10CaO‐70SiO2 have been bombarded with a rastered beam of either 7‐ or 10‐keV electrons. SIMS analysis of these glasses indicates a near‐surface layer deficient in Na, bounded by a steep rise of the Na signal. The thickness of this layer increases with electron‐bombardment time until it becomes close to the expected maximum range of electron penetration. No Ca displacement was observed. Below the Na‐deficient layer, a layer containing uncombined Na was found.