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RESEARCH PRODUCT
ESD of nonthermal halogen atoms from In-doped (001) KBr
P. CzubaJacek J. KolodziejMarek SzymonskiG. BaranAnatoli I. PopovIrena PlavinaZbigniew PostawaP. Piatkowskisubject
Nuclear and High Energy PhysicsRange (particle radiation)ChemistryImpurityAstrophysics::High Energy Astrophysical PhenomenaDesorptionDiffusionHalogenDopingAtomic physicsKinetic energyInstrumentationSpectral linedescription
Abstract We have measured the kinetic energy distributions of neutral halogen atoms emitted due to electron-stimulated desorption (ESD) from In-doped (001)KBr single crystals. The concentration of In+ in investigated samples varied between 1017 and 1020 particles/cm3. The measurements were performed at target temperature of 150°C. In all cases the energy spectra consist of two peaks. The distribution of low-energy particles can be described by the thermal (Maxwellian) energy spectrum. Particles contributing to the second peak have nonthermal kinetic energies. The emission of halogen atoms having nonthermal energies decreases with an increase in the concentration of In impurities. At the same time, the emission of thermal particles does not seem to be sensitive to variation of In+ concentration. At the temperatures of interest here, In+ impurities are known to be very efficient traps for migrating holes but not to influence the migration of H-centers. The obtained results support the model of nonthermal halogen desorption which requires a long range diffusion of holes from the bulk to the surface as a necessary step of the process.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-06-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |