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The role of irradiation induced surface defects on the chemisorption process of hydrogen and inward penetration of chemisorbed H atoms was studied on sputtered, with 4.5 keV Ar + ions and on annealed gadolinium surfaces. A combination of Direct Recoil Spectrometry (DRS) and Contact Potential Difference (CPD) enabled to distinct between topmost surface and subsurface processes. Simulations of irradiation-induced...