OptiMetrics, Inc. 1 article published in JoVE Chemistry An Inverse Analysis Approach to the Characterization of Chemical Transport in Paints Matthew P. Willis1, Shawn M. Stevenson1, Thomas P. Pearl2, Brent A. Mantooth1 1Decontamination Sciences Branch, U.S. Army Edgewood Chemical Biological Center, 2OptiMetrics, Inc., a DCS Company In this paper, a procedure for quantifying the mass transport parameters of chemicals in various materials is presented. This process involves employing an inverse-analysis based diffusion model to vapor emission profiles recorded by real-time, mass spectrometry in high vacuum.