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Hydrogen-vacancy interaction in molybdenum

Vacancy-hydrogen interaction in molybdenum was investigated by means of the perturbed angular correlation technique, using the isotope 111In as a probe. The complex InV2 turned out to trap up to two hydrogen atoms. Assuming a hydrogen migration energy of 0.35 eV, the authors found the binding energies of the first and second hydrogen atoms to be 1.07(3) eV and 0.44(3) eV, respectively, while the binding energy of the next hydrogen atom is <0.25 eV. The sign of the frequency shift due to the second hydrogen atom trapped at InV2 is opposite to that recently observed in tungsten, and the dissociation energy is much smaller.