37 research outputs found
Relativistic photoionization cross sections for C II
High resolution measurements of photoionization cross sections for atomic
ions are now being made on synchrotron radiation sources. The recent
measurements by Kjeldsen etal. (1999) showed good agreement between the
observed resonance features and the the theoretical calculations in the close
coupling approximation (Nahar 1995). However, there were several observed
resonances that were missing in the theoretical predictions. The earlier
theoretical calculation was carried out in LS coupling where the relativistic
effects were not included. Present work reports photoionization cross sections
including the relativistic effects in Breit-Pauli R-matrix (BPRM)
approximation. The configuration interaction eigenfunction expansion for the
core ion C III consists of 20 fine structure levels dominated by the
configurations from 1s^22s^2 to 1s^22s3d. Detailed features in the calculated
cross sections exhibit the missing resonances due to fine structure. The
results benchmark the accuracy of BPRM photoionization cross sections as needed
for recent and ongoing experiments.Comment: 13 pages, 3 figure
Relativistic close coupling calculations for photoionization and recombination of Ne-like Fe XVII
Relativistic and channel coupling effects in photoionization and unified
electronic recombination of Fe XVII are demonstrated with an extensive 60-level
close coupling calculation using the Breit-Pauli R-matrix method.
Photoionization and (e + ion) recombination calculations are carried out for
the total and the level-specific cross sections, including the ground and
several hundred excited bound levels of Fe XVII (up to fine structure levels
with n = 10). The unified (e + ion) recombination calculations for (e + Fe
XVIII --> Fe XVII) include both the non-resonant and resonant recombination
(`radiative' and `dielectronic recombination' -- RR and DR). The low-energy and
the high energy cross sections are compared from: (i) a 3-level calculation
with 2s^2p^5 (^2P^o_{1/2,3/2}) and 2s2p^6 (^2S_{1/2}), and (ii) the first
60-level calculation with \Delta n > 0 coupled channels with spectroscopic
2s^2p^5, 2s2p^6, 2s^22p^4 3s, 3p, 3d, configurations, and a number of
correlation configurations. Strong channel coupling effects are demonstrated
throughout the energy ranges considered, in particular via giant
photoexcitation-of-core (PEC) resonances due to L-M shell dipole transition
arrays 2p^5 --> 2p^4 3s, 3d in Fe XIII that enhance effective cross sections by
orders of magnitude. Comparison is made with previous theoretical and
experimental works on photoionization and recombination that considered the
relatively small low-energy region (i), and the weaker \Delta n = 0 couplings.
While the 3-level results are inadequate, the present 60-level results should
provide reasonably complete and accurate datasets for both photoionization and
(e + ion) recombination of Fe~XVII in laboratory and astrophysical plasmas.Comment: 19 pages, 8 figures, Phys. Rev. A (submitted
ELECTRON SCATTERING FROM HYDROGEN ATOMS AND H-LIKE IONS
Cette revue pour l'"Atomic Data Workshop" de Meudon (1-2 septembre 1989) est une mise à jour de l'atelier précédent (St. Catherine's College Oxford, 1987) pour ce qui est des données sur la diffusion des électrons par les atomes d'hydrogène et les ions hydrogénoïdes. Pour l'hydrogène, le nouveau calcul "Intermediate Energy R-Matrix" (IERM) de Scholz et al. devient la source recommandée de taux d'excitation pour les transitions 1s-2s et 1s-2p ; pour les ions hydrogénoïdes multichargés, les formules semi-empiriques de Sampson et Zhang sont recommandées.This review, for the "Atomic Data Workshop" held at Meudon 1-2 September 1989, provides an update on the last Workshop (at St Catherine's College Oxford, 1987) for data on electron scattering from hydrogen atoms and H-like ions. For hydrogen, the new "Intermediate Energy R-Matrix" (IERM) calculation by Scholz et al becomes the recommended source of excitation rates for the 1s - 2s and 1s - 2p transitions ; for highly charged H-like ions Sampson and Zhang's semiempirical formulae are recommended