The Photon-stimulated Desorption of Excited Alkali Atoms from Alkali Halide Surfaces
Title | The Photon-stimulated Desorption of Excited Alkali Atoms from Alkali Halide Surfaces PDF eBook |
Author | Patrick Harry Bunton |
Publisher | |
Pages | 212 |
Release | 1990 |
Genre | Alkali metal halides |
ISBN |
Electron- and Photon-stimulated Desorption of Excited Hydrogen Atoms from Alkali Halide Surfaces
Title | Electron- and Photon-stimulated Desorption of Excited Hydrogen Atoms from Alkali Halide Surfaces PDF eBook |
Author | Lawrence Thomas Hudson |
Publisher | |
Pages | 236 |
Release | 1989 |
Genre | Alkali metal halides |
ISBN |
New Mechanism for the Desorption of Excited Atoms by Photon Bombardment of Alkali Halide Crystals
Title | New Mechanism for the Desorption of Excited Atoms by Photon Bombardment of Alkali Halide Crystals PDF eBook |
Author | |
Publisher | |
Pages | 17 |
Release | 1991 |
Genre | |
ISBN |
We report measurements of photon-stimulated desorption of excited atoms from LiF and NaCl crystal surfaces. Based on these measurements, we propose a new model of photon-initiated, defect-mediated desorption involving exoergic surface reactions between alkali dimers and halogens. This model consists of two steps: (a) reactants are formed at the surface, directly or by the migration to the surface of holes and defects created in the near surface bulk, due to uv photon bombardment, and (b) excited alkali atoms are emitted following a reaction between the alkali and halogen surface species. jg p2.
Photon- and Electron-stimulated Desorption of Alkali Atoms from Alkali Halide Crystal Surfaces
Title | Photon- and Electron-stimulated Desorption of Alkali Atoms from Alkali Halide Crystal Surfaces PDF eBook |
Author | Dengfa Liu |
Publisher | |
Pages | 244 |
Release | 1992 |
Genre | Alkali metal halide crystals |
ISBN |
Inelastic Processes in the Electron and Photon Stimulated Desorption of Alkali Halide Surfaces
Title | Inelastic Processes in the Electron and Photon Stimulated Desorption of Alkali Halide Surfaces PDF eBook |
Author | Thomas Richard Pian |
Publisher | |
Pages | 334 |
Release | 1982 |
Genre | Collisions (Nuclear physics) |
ISBN |
Electron- and Photon-stimulated Desorption of Excited CN Molecules from Alkali-halide and Alkalai-metal Surfaces
Title | Electron- and Photon-stimulated Desorption of Excited CN Molecules from Alkali-halide and Alkalai-metal Surfaces PDF eBook |
Author | Jun Xu |
Publisher | |
Pages | 290 |
Release | 1991 |
Genre | Alkali metal halides |
ISBN |
Excitonic Mechanism of Photon-Simulated Desorption of Excited Alkali Atoms from Alkali Halides
Title | Excitonic Mechanism of Photon-Simulated Desorption of Excited Alkali Atoms from Alkali Halides PDF eBook |
Author | Patrick H. Bunton |
Publisher | |
Pages | 4 |
Release | 1992 |
Genre | |
ISBN |
The mechanism leading to photon-stimulated desorption (PSD) of excited atoms from the surfaces of alkali halides has been a subject of controversy since it was first discussed a decade ago. We have recently carried out a systematic experimental study of PSD from alkali halides under both valence-band and core-level excitation. Our data demonstrate that the desorption yields for excited alkali atoms track the excitonic optical response of these crystals even at photon energies below the bulk band gap. Secondary electron measurements, taken simultaneously, implicate the formation of excess metal in the time and dose dependence of PSD yields. These results suggest a unified picture of PSD in which the ion motion initiating desorption is pictured as the decay of a localized, highly deformed vibrational mode of the crystal. Plausible mechanisms for creation of the excited atomic state include relaxation of excited F-centers and resonant neutralization into the excited state on metallic microclusters.