Thermodesorption of deuterium implanted into Ni at T ≅ 100 K

The thermodesorption (TD) of ion-implanted deuterium from the nickel samples irradiated to different doses by 25 keV D2+ ions at temperature T approx K was investigated. The dependence of thermodesorption spectrum structure on irradiation dose in the range of 5 · 1014 to 6 · 10 18 D/sm2 was studied. It is shown that the spectrum structure becomes more complicated with the growth of dose due to the appearance of new TD peaks, the number of which increases from 1 to 7 in the interval of doses under study. The phenomenon of inversion of the direction of the spectrum building up on the temperature scale is found. It consists in the following: first, the building up of the spectrum (the appearance of new peaks) goes in the direction of temperature increase, but after the achievement of the dose 1 · 1017 sm-2 the further building up goes in the opposite direction. The theoretical model for the description of the measured TD spectra was offered. Based on this model, the activation energies were determined for peaks at temperatures of 260,310,340,385,430,520 K; they appeared equal to 0.38;0.47;0.52;0.59;0.65;0.74 eV, respectively