Physics – Atomic Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058..289w&link_type=abstract
In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 289-291 (SEE N90-18957 11-70)
Physics
Atomic Physics
Auger Spectroscopy, Electron Energy, Electron Spectroscopy, Positron Annihilation, Atomic Energy Levels, Atomic Physics, Electron Beams, Electron Transitions, Probability Theory, Wave Functions
Scientific paper
Recently, Weiss et al. have demonstrated that it is possible to excite Auger transitions by annihilating core electrons using a low energy (less than 30eV) beam of positrons. This mechanism makes possible a new electron spectroscopy, Positron annihilation induced Auger Electron Spectroscopy (PAES). The probability of exciting an Auger transition is proportional to the overlap of the positron wavefunction with atomic core levels. Since the Auger electron energy provides a signature of the atomic species making the transition, PAES makes it possible to determine the overlap of the positron wavefunction with a particular element. PAES may therefore provide a means of detecting positron-atom complexes. Measurements of PAES intensities from clean and adsorbate covered Cu surfaces are presented which indicate that approx. 5 percent of positrons injected into CU at 25eV produce core annihilations that result in Auger transitions.
Jensen Kirsten Ottar
Koymen Ali R.
Lee Han-Koo
Lei Chun
Mehl David
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