Abstract
Detailed calculations of energies and widths of Ca autoionizing states and the related resonance structure in electron-impact excitation of the 4{ital s}-4{ital p} transition in Ca{sup +} are performed using the diagonalization method. This method is divided into two steps: a three-state (4{ital s},3{ital d},4{ital p}) close-coupling calculation of cross sections and extensive configuration-interaction calculations of wave functions of autoionizing states. Both steps take into account the correlations related to one- and two-body core-polarization potentials. The results of calculations of energies, oscillator strengths, and autoionizing widths of doubly excited states of Ca are in better agreement with the experimental data than any other calculation. Rich resonance structure is predicted by theory at incident electron energies below the 5{ital s} threshold. The present results support the general pattern of the measurements of Frontov (Opt. Spectrosc. 9, 460 (1985)), although there are some discrepancies in the details, particularly the existence of the high and broad resonance at that threshold. A detailed comparison with the previous resonance calculations by Mitroy {ital et} {ital al}. (Phys. Rev. A 38, 3339 (1988)) is carried out.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical review. A, Atomic, molecular, and optical physics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
