Figure 8
From: Vacancy-Hydrogen Interaction in Niobium during Low-Temperature Baking

Results of bulk PALS measurements of samples annealed ex-situ in a vacuum furnace: temperature dependence of (a) lifetimes of exponential components resolved in LT spectra. The free positron lifetime \({\tau }_{1}^{STM}\) calculated within the two state trapping model is shown in the figure as well; (b) relative intensity \({I}_{2}\) of positrons trapped at defects.