Surface-shifted deuterium profiles are re-examined in deuterium-ion irradiation experiments by using a combined experimental and modelling approach. Recrystallized tungsten foil samples were irradiated with energetic deuterium ions and the defect and deuterium depth profiles were studied using positron annihilation spectroscopy and secondary ion mass spectroscopy. We report direct experimental evidence of trapping of deuterium at the vacancies created by the deuterium ions themselves during the implantation by using positron annihilation studies. The deuterium profile is simulated using a Monte-Carlo diffusion model by taking into account the defect-aided diffusion of deuterium due to the local strain field created by the vacancies. The simulations also elucidate the role of the anisotropy in the diffusion and trapping of deuterium in ion-implantation experiments in metals.

通过使用组合的实验和建模方法，在氘离子辐照实验中重新检查了表面偏移的氘分布。用高能氘离子辐照重结晶的钨箔样品，并使用正电子an没光谱法和二次离子质谱法研究缺陷和氘深度曲线。我们报告使用正电子an灭研究在植入过程中由氘离子自身产生的空位处俘获氘的直接实验证据。使用蒙特卡洛扩散模型，通过考虑空位产生的局部应变场导致的缺陷辅助氘扩散，可以模拟氘的分布。