Нybrid model of hydrogen thermodesorption from structural materials

Thermodesorption spectrometry (TDS) is one of the effective methods for studying the interaction of structural materials with hydrogen isotopes. A thin plate made of a material with metallic properties is considered. The sample pre-saturated with dissolved hydrogen is slowly heated in a vacuum chamber. The degassing flux is recorded using a mass spectrometer. The TDS spectrum is the dependence of the desorption flux density on the current temperature is analysed. The paper presents a new hybrid model of thermodesorption, which operates with both volume-averaged concentrations and surface concentration. The dynamics of concentration is determined by nonlinear dynamic boundary conditions.