Hydrogen-vacancy interaction in tungsten was investigated by means of the perturbed angular correlation technique, using the isotope '"In as a probe.Hydrogen trapping at an "'In-vacancy cluster manifests itself as a change of the locd electric field gradient, which gives rise to an observable shift of the quadrupole frequency. The measurements show that a vacancy in tungsten can trap one or two hydrogen a t o m at room temperature. The detrapping energies of the first and second hydrogen atom are 1.55(2) and 1.38(2) eV, mpectively, while the detrapping enof the next hydrogen atom is less than 1.1 eV. Substitutional " ' I n atoms do not trap hydrogen at room temperature. At least two more hydmga decorated defects were observed. Although their StmctureS are not quite clear, they probably fonn from larger vacancy clusters and may eontain a large amount of hydrogen. The dissociation energy of these bubble-like defects is 1.30(2) eV.
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