Thin Film Sputtering Composition Technique in the Sputtering Process Secondary Ion Mass Spectrometry (SIMS) is a Thin Film Sputtering technique. Used in materials, this science studies the composition of thin films and solid surfaces. Implemented by using the sputtering the sample’s surface with a focused primary ion beam. In recent years, there has been an increasing interest in studying dopants and contaminants in thin layers near surface in samples. This is due to device structures get smaller and smaller. SIMS can be used for examining the elementary composition of the surface as well as near surface region of samples. Measured sensitivity is down to parts per billion. In order to get the maximum performance from the device, atmospheric contaminants with low atomic weight such as and oxygen (O), carbon (C), and hydrogen (H) should have low concentration levels.