A review was presented of work on the properties of H defect centers, as studied via µSR spectroscopy (muon spin rotation, relaxation and resonance). Particular attention was paid to results which were obtained by using a form of nuclear quadrupole resonance. Implanted positive muons were used to model the behaviour of interstitial protons. The resultant defect centres exhibited metastability and bi-stability. They remained as positive ions, but partitioned themselves between a highly mobile species and one which was trapped and immobilized - at up to 800K - in cage-like sites adjacent to N. The barrier to escape from the cage was 0.86eV. Data on the neutral paramagnetic centre suggested that H might act as a shallow-donor in InN.

Hydrogen in Group-III Nitrides, Studied by Muon Spin Resonance. S.F.J.Cox, R.L.Lichti, E.A.Davis: Journal of Physics D, 2002, 35[3], 586-90