1. Thermal Dissociation of Surface OH-and OD-Groups on Magnesiumoxide
- Author
-
E. G. Derouane, F. Freund, and R. Martens
- Subjects
Physics and Astronomy (miscellaneous) ,Chemistry ,Hydrogen molecule ,General Engineering ,General Physics and Astronomy ,chemistry.chemical_element ,Mass spectrometry ,Photochemistry ,Oxygen ,Dissociation (chemistry) ,law.invention ,Paramagnetism ,law ,Vacancy defect ,Thermal dissociation ,Physical chemistry ,Electron paramagnetic resonance - Abstract
The thermal dissociation of surface OH- and OD- groups on high-purity MgO was studied by means of electron spin resonance and by mass spectrometry. The results indicate that residual OH- and OD- groups neighboring a vacancy in the oxygen lattice may decompose thermally evolving molecular hydrogen and, at the same time, forming paramagnetic V centers. Schematically: 2OH-→2O-+H2 and 2OD-→2O-+D2 respectively. The dissociation probability of OD- groups appears to be higher than that of OH- groups by a factor of about 4.
- Published
- 1974
- Full Text
- View/download PDF