Qualitative and parametric identification of two-peak hydrogen thermal desorption spectra

Two variants of modeling the thermal desorption of hydrogen isotopes from structural materials are considered. The first is in the form of superposition of first- and second-order reactions for volume-averaged concentrations. The second is a distributed model in the form of a nonlinear boundary value problem with dynamic boundary conditions reflecting processes in the volume and on the surface of the material. It is shown that when identifying the spectra, it is necessary first to identify the physicochemical causes of various thermal desorption peaks (this is the interaction with inhomogeneities of the material with different binding energies or the dynamics of the surface-volume interaction), and only after that to estimate the kinetic parameters of a physically based model.