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2006A&A...457..721N - Astronomy and Astrophysics, volume 457, 721-728 (2006/10-2)

Atomic data from the Iron Project. LXII. Allowed and forbidden transitions in Fe XVIII in relativistic Breit-Pauli approximation.


Abstract (from CDS):

An extensive set of oscillator strengths (f), line strengths (S) and radiative decay rates (A) for the allowed and forbidden transitions in Fe XVIII is presented. The results include 1174 fine structure levels of total angular momenta J=1/2-17/2 of even and odd parities with 2≤n≤10, 0≤l≤9, orbital angular momenta, 0≤L≤11, and spin multiplicities 2, 4. These yeild about 171500 transitions. The allowed electric dipole (E1) transitions, 141869 in total, are obtained in the close coupling approximation using the relativistic Breit-Pauli R-matrix (BPRM) method. The forbidden electric quadrupole (E2), octupole (E3), and magnetic dipole (M1), quadrupole (M2) transitions, 29682 in total, are obtained from configuration interaction Breit-Pauli atomic structure calculations using the code SUPERSTRUCTURE. The close coupling wavefunction expansion for Fe XVIII includes 10 levels of configurations 2s22p4, 2s2p5, and 2p6 in the BRPM calculations. All fine structure levels have been identified spectroscopically. Comparison of the present energies with the available observed energies shows very good agreement. The lifetime of level 2s2p6 2S calculated from the present radiative decay rate agrees very well with the single measurement. The present decay rate for the well known E2 line arising from 2p5(23/2-21/2) transition within the ground state term also agrees almost exactly with NIST tabulated value. However, varying degree of agreement is found with previously calculated values for some transitions.

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Journal keyword(s): atomic processes - atomic data - line: formation - X-rays: general - ultraviolet: general - infrared: general

VizieR on-line data: <Available at CDS (J/A+A/457/721): table3a.dat table3b.dat table4a.dat set.dat table4b.dat table7.dat table8a.dat table8b.dat f.allowed.fe18.user f.forbid.fe18.user lifetime.f>

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