First-principles investigations had suggested that H might act as a shallow donor in ZnO. These predictions also applied to D. Using infra-red spectroscopy, O–H and O–D stretching modes were observed at 3326.3 and 2470.3/cm, respectively, at 14K. These frequencies were in good agreement with the theoretical predictions for H and D in an anti-bonding configuration. Preliminary polarization measurements were also performed at room temperature which showed that the dipole of the O–H complex did not lie parallel to the c-axis of wurtzite ZnO.

Infrared Spectroscopy of Hydrogen in Annealed Zinc Oxide. S.J.Jokela, M.D.McCluskey, K.G.Lynn: Physica B, 2003, 340-342, 221-4