Low-coordinated oxygen sites on MgO surfaces
EMSL Project ID
10893
Abstract
Recently, we have measured the pphotoluminescnece of MgO particles as a function of the excitation wavelength (4.6 eV and 5.1 eV) and observed two emission bands at 3.3 and 3.4 eV. According to theoretical calculation (Shuler, et al) these are attributable to three-fold coordinated anions with different local structure. Prolonged UV exposure leads to ionization and the formation of O-. The ESR data does not exclude the presence of (O2)2- species. However, IR-spectroscopy experiments don’t give any further hints.This collaboration envisions the use of nanoporous MgO thin films developed in the EMSL 1221 laboratories and used there in oxygen laser desorption measurement of low-coordinated sites. EPR/ESR and PL studies of them would then be compared to CVD-grown MgO from our Austrian lab to help elucidate the formation and role of low-coordinate oxygen exciation and ionization on MgO surfaces.
Project Details
Project type
Exploratory Research
Start Date
2004-08-20
End Date
2007-03-19
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Energy and site selectivity in O-atom photodesorption from nanostructured MgO; Kenneth M. Beck, Alan G. Joly, Oliver Diwald, Slavica Stankic, Paolo E. Trevisanutto, Peter V. Sushko, Alexander L. Shluger, Wayne P. Hess; Surface Science 602 (2008) 1968-1973