Series perturbations in atomic spectra: Superposition-of-configurations calculations on Al I and Al II

Theoretical lifetimes of the Al2S,2Theodosiou1 1992Phys. Rev. A14140View full textAdd to dashboardCite

“…Actually the former state, which has not yet been identified experimentally, is believed to be spread along the whole nd D series, and theoretically there is disagreement as to whether it lies above or below the ionization limit. Various approaches have been used to calculate the percentage of mixing of the nd states with the perturber, starting with the well-known work of Weiss [1].…”

“…The 3s subshell has strong correlations and affect, at least, the lower excited states, the outer orbitals of which penetrate substantially the core. To treat satisfactorily such a system, one must perform a full multiconfiguration, close-coupling, or a configurationinteraction (CI) calculation such as the ones by Weiss [1], Trefftz [14], and Taylor, Bauschlicher and Langhoff [15].…”

“…where the mixing coefficients a and P are obtained either from an ab initio calculation [1,14,15,22] or from a semiempirical fit of the experimental data, e.g. , a fit of the ex-…”

Spin-orbit effects in aluminum photoionization

“…(6).At lower energies some channels are closed and these solutions are unphysical since f(r) and g(r) are asymptotically divergent for negative energies. These divergent terms are eliminated by taking an appropriate linear combination of solutions(6), which modifies the K matrix into the form [Radial functions P"i(r) for the 3s, 3p, and 3d orbitals of Al are shown (on a scale evenly distributed in~r ) in the primitive-orbital basis (solid lines) and in the natural-orbital basis (dashed lines). to the reduced dipole-matrix elements connecting the initial and final states[18].At this point all calculations have been performed in the nonrelativistic fashion, assuming pure LS coupling;…”

Compact GSGG:Cr3+:Nd3+laser with passiveQswitching

“…On the other hand, the complex states themselves are strongly influenced by the mixing with the Rydberg states. This can be seen in the case of the 2D states of the configuration 3s3p2 in A1 I which are 'smeared out' over the Rydberg series 3s'n'd thereby losing their identity (Weiss 1974). The interconfiguration interaction, of course, is not restricted to the bound Rydberg states ns'n'l but also applies to the continuum states ns2&l with the result that complex states above the ionisation limit can decay by autoionisation.…”