Picture of smart phone in human hand

World leading smartphone and mobile technology research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by Strathclyde researchers from the Department of Computer & Information Sciences involved in researching exciting new applications for mobile and smartphone technology. But the transformative application of mobile technologies is also the focus of research within disciplines as diverse as Electronic & Electrical Engineering, Marketing, Human Resource Management and Biomedical Enginering, among others.

Explore Strathclyde's Open Access research on smartphone technology now...

Dielectronic recombination (via N = 2→N = 2 core excitations) and radiative recombination of Fe xx: Laboratory measurements and theoretical calculations

Savin, D.W. and Behar, E. and Kahn, S.M. and Gwinner, G. and Saghiri, A.A. and Schmitt, M. and Grieser, M. and Repnow, R. and Schwalm, D. and Wolf, A. and Bartsch, T. and Müller, A. and Schippers, S. and Badnell, N.R. and Chen, M.H. and Gorczyca, T.W. (2002) Dielectronic recombination (via N = 2→N = 2 core excitations) and radiative recombination of Fe xx: Laboratory measurements and theoretical calculations. Astrophysical Journal, 138. pp. 337-370. ISSN 0004-637X

Text (strathprints005828)
strathprints005828.pdf - Accepted Author Manuscript

Download (960kB) | Preview


We have measured the resonance strengths and energies for dielectronic recombination (DR) of Fe XX forming Fe XIX via N = 2 → N′ = 2 (N = 0) core excitations. We have also calculated the DR resonance strengths and energies using AUTOSTRUCTURE, HULLAC, MCDF, and R-matrix methods, four different state-of-the-art theoretical techniques. On average the theoretical resonance strengths agree to within . 10% with experiment. The AUTOSTRUCTURE, MCDF and R-matrix results are in better agreement with experiment than are the HULLAC results. However, in all cases the 1σ standard deviation for the ratios of the theoretical-to-experimental resonance strengths is & 30% which is significantly larger than the estimated relative experimental uncertainty of . 10%. This suggests that similar errors exist in the calculated level populations and line emission spectrum of the recombined ion. We confirm that theoretical methods based on inverse-photoionization calculations (e.g., undamped R-matrix methods) will severely overestimate the strength of the DR process unless they include the effects of radiation damping. We also find that the coupling between the DR and radiative recombination (RR) channels is small.