Resonance enhancement of electron-impact excitation rates for argonlike ions

Autor:	Mau Hsiung Chen, Bernd Crasemann
Rok vydání:	1991
Předmět:	Physics Autoionization Atomic electron transition Electron capture Resonance Physics::Atomic Physics Electron Atomic physics Relativistic quantum chemistry Atomic and Molecular Physics and Optics Electron ionization Excitation
Zdroj:	Physical Review A. 43:5886-5890
ISSN:	1094-1622 1050-2947
DOI:	10.1103/physreva.43.5886
Popis:	We have calculated the electron-impact excitation-rate coefficients for the 3p-3d transitions of Ar-like ions with Z=42, 54, and 63. The direct-excitation rates were evaluated with relativistic multiconfiguration target wave functions in a distorted-wave approximation. The contributions from the autoionizing resonances were calculated by the multiconfiguration Dirac-Fock method. For most transitions, autoionizing resonances are found to enhance the rate coefficients by factors of 2--3 for electron temperatures below the temperature at which peak excitation occurs. The enhancement is much less at higher temperatures.
Databáze:	OpenAIRE
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