Oscillator Strengths of Near‐Infrared Lines of Feii

Abstract

We present extensive configuration interaction calculations of oscillator strengths and transition rates of certain near-infrared emission lines of Fe ii observed in the BD Weigelt blobs of Carinae. Comparison is made between our work and results available in existing databases. We offer arguments in favor of our results being the most accurate, where differences occur.

The FERRUM project: transition probabilities for forbidden lines in [Fe II] and experimental metastable lifetimes

“…Calculations are sensitive to level mixing and performing ab initio calculations which reproduce the mixing properties of the system is not trivial. This is illustrated in Nahar & Pradhan (1994), Nahar (1995), Hibbert & Corrégé (2005), Corrégé & Hibbert (2006) and Pickering et al (2002). In particular, Pickering et al (2002) emphasized that even though the agreement between the theoretical and experimental Fe ii Avalues investigated by Pickering et al (2002) are in general extremely good, probabilities related to spin forbidden transitions that occur due to level mixing may differ by up to an order of magnitude.…”

Importance of level mixing on accurate [Fe II] transition rates

“…Here we report on a few of them which have attracted observational and laboratory interest. We have used almost the same set of optimised orbitals generated in recent calculations from our group (Corrégé & Hibbert 2005, 2006. However, we have made one change: in order to get better ab initio energy differences for the 3d 7 levels we used the Hartree-Fock (HF) 3d function given by Clementi and Roetti (1974) for 3d 7 4 F instead of their 3d of the 3d 6 4s ground configuration chosen in previous calculations (Corrégé & Hibbert 2005, 2006.…”

Electron-impact excitation of Fe II: Effective collision strengths for optically allowed fine-structure transitions

“…These 26 temperatures are presented in two rows of 13 ranging from 100 to 100,000 K. The effective collision strengths for each i-j transition are presented in rows for each electron temperature. A superscript indicates the power of 10 by which the number should be multiplied i.e., a Àn = a  10 Àn [22] 0.232 0.534 -Kurucz [19] 0.115 0.493 -Donnelly and Hibbert [23] --0.131 Raassen and Uylings [20] 0.406 0.561 0.126 Bergeson et al [24] 0.239 0.320 0.114 Nahar [21] 0.2936 0.3976 0.1263 Nahar and Pradhan [25] 0.2945 0.399 0.126 Fuhr et al [26] 0.22 0.39 0.11 Kurucz [27] 0.261 0.361 0.129 Fawcett 28] 0.2969 0.4344 0.166 Kurucz [29] 0.297 0.413 0.0938 Nussbaumer et al [30] 0.294 0.398 0.150 Nussbaumer and Storey [5] 0.303 0.460 0.212 6.62 À2 6.63 À2 6.63 À2 6.62 À2 6.56 À2 6.50 À2 6.46 À2 6.45 À2 6.46 À2 6.48 À2 6.51 À2 6.54 À2…”