Molecular Beam Dosers, Calibrated Thermal Desorption Spectrometry, Gas Chromatograph/Mass Spectrometer (GCMS) Several types of instrumentation are available to study the thermodynamics and kinetics of gas adsorption and desorption processes. A highly calibrated Thermal Desorption Spectrometer has been built and it yields quantitative information about gas dissociation and decomposition pathways on surfaces. Molecular beam dosers provide