New Mechanism for the Desorption of Excited Atoms by Photon Bombardment of Alkali Halide Crystals

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...

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Bibliographic Details
Main Authors: Liu, D, Albridge, R. G, Barnes, A. V, Bunton, P. H, Ewig, C. S
Format: Report
Language:English
Subjects:
ALKALI METAL COMPOUNDS
Atomic and Molecular Physics and Spectroscopy
ATOMS
Crystallography
CRYSTALS
DEFECT ANALYSIS
DESORPTION
DIMERS
EXCITATION
EXOTHERMIC REACTIONS
HALIDES
HALOGENS
HOLES(ELECTRON DEFICIENCIES)
Inorganic Chemistry
LITHIUM FLUORIDES
MEASUREMENT
Particle Accelerators
PHOTON BOMBARDMENT
PHOTONS
Physical Chemistry
REPRINTS
SODIUM CHLORIDE
STIMULATION(GENERAL)
SURFACE REACTIONS
SURFACES
ULTRAVIOLET RADIATION
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Summary: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