It was suggested that Fe was compensated by a donor which was related to the 2316/cm local vibrational mode that had been attributed to VInH4. By using  ab initio  local density functional cluster calculations, it was found that the fully hydrogenated In vacancy, VInH4, acted as a single shallow donor and had a triplet vibrational mode at around this value. An analysis was also made of other hydrogenated vacancies, VInHn (where n was 1 or 3), with regard to their structure, vibrational modes and charge states. Substitutional group-II impurities also acted as acceptors, but could be passivated by H. An investigation was made of the passivation of Be by H, and it was found that the H was situated in a bond-centered site and was bonded to its P neighbor. Its calculated vibrational modes were in good agreement with experiment.

C.P.Ewels, S.Oberg, R.Jones, B.Pajot, P.R.Briddon: Materials Science Forum, 1995, 196-201, 969-74