Hydrogen Isotope Exchange in Tungsten at Low Temperatures

The isotope exchange of deuterium (D) by protium (H) in tungsten is investigated in-situ with nuclear reaction analysis and mass spectrometry at temperatures ranging from 150 to 290 K. The experimental data is simulated based on the classical and the fill-level model, each with and without taking the kinetic de-trapping of D by H in the implantation range into account. In contrast to the fill-level model the classical model requires the kinetic de-trapping mechanism to describe the data.