Auger decay mechanism in photon-stimulated desorption from sodium fluoride
Photon-stimulated desorption of Na/sup +/ and F/sup +/ occurs from a NaF(100) cleaved surface upon Na(1s) excitation. These measurements represent the first observation of metal-cation desorption following metal-cation--core excitation. In agreement with the Auger decay model of desorption, both sodium and fluorine positive-ion yields (versus photon energy) are similar to total electron yield in the vicinity of the Na K edge, except for a pre-edge peak observed predominantly in Na/sup +/ desorption. Intra-atomic Auger decay of the Na(1s) core hole followed by charge transfer from adjacent halogens is shown to initiate desorption. The resulting neutral or positively charged halogens provide the driving force for desorption of sodium ions from the surface. Expressions are developed for the maximal energy available to the desorbing Na/sup +/ or F/sup +/ ions.
- Research Organization:
- Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 and Department of Chemistry, University of California, Berkeley, California 94720
- OSTI ID:
- 5434436
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 28:8; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molecular-dynamics simulation of positive-ion and neutral halogen desorption following Na K-shell Auger cascades in the NaF crystal
Photon-stimulated desorption as a measure of surface electronic structure