Near-threshold electron-impact ionization of calcium atoms |
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Authors: | J E Kontros I V Chernyshova O B Shpenik |
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Institution: | (1) 190 Barclay Court, Piscataway, New Jersey 08854, USA;(2) Stirling University, Stirling, UK;(3) Max-Planck-Gesellschaft, Fritz-Haber-Institut, Faradayweg 4-6, 14195 Berlin, Germany |
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Abstract: | The electron-impact ionization of calcium atoms is studied in the near-threshold energy range (from 6.11 to 16 eV). Experiments
were performed by the method of intersecting electron and atomic beams with the recording of formed positive calcium ions.
The electron beam (ΔE
1/2 = 0.15 eV) was formed using a hypocycloidal electron monochromator. An analysis of the specific features of ionization cross
sections revealed a contribution from the excitation and decay of low-lying autoionization atomic states, which converge to
the excitation thresholds of the 3d, 4p, and 5s ionic levels, and resonances (long-lived states of negative ions). The specific features of cross sections are identified
using the experimental and theoretical data on photoionization (photoabsorption). |
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Keywords: | |
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