Accession Number : ADA190924

Title :   Contributions of Autoionizing Resonances to the Electron Collisional Excitation Rates for Be-Like Ions,

Corporate Author : MINISTERE DES ARMEES SAINT-CLOUD (FRANCE) DIRECTION TECHNIQUES DES ARMEMENTS TERRESTRES

Personal Author(s) : Chen, Mau H ; Crasemann, Bernd

PDF Url : ADA190924

Report Date : 22 Sep 1987

Pagination or Media Count : 28

Abstract : The contributions of autoionizing resonances to the electron-impact excitation-rate coefficients for the n = 2 to n = 2 transitions in Be-like ions have been evaluated for six ions with atomic numbers Z = 30, 34, 36, 42, 47, and 54. The calculations were carried out in the isolated-resonance approximation. Interference between direct and resonance channels was neglected. The detailed Auger and radiative rates were computed using the multiconfiguration Dirac-Fock model. Results for 45 transitions among 10 states from '1s2 2l 2l' configurations are listed. For electric dipole allowed transitions, the contributions from the autoionizing resonance are quite small. However, the autoionizing resonances can enhance the excitation rates by a factor of 2-4 dipole forbidden transitions.

Descriptors :   *ELECTRON IMPACT SPECTRA, *AUGER ELECTRON SPECTROSCOPY, ATOMIC PROPERTIES, CHANNELS, COLLISIONS, ELECTRONS, EXCITATION, IONIZATION, IONS, MASS NUMBER, RADIATION, RATES, RESONANCE, BERYLLIUM, ELECTRON TRANSITIONS

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE