Physics – Atomic Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944303b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #443.03
Physics
Atomic Physics
Scientific paper
Several of the most important astronomical topics today that involve UV and optical astronomical spectroscopy require detailed understanding of singly and doubly ionized iron-peak species (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu). Yet, our present knowledge of the atomic physics and spectra is lagging behind the avalanche of high quality spectra arising from these ions.
We are carrying out a systematic study of each of these species aiming to provide complete spectral models containing radiative rates and collision strengths. The present atomic computations employed a combination of state of the art atomic physics methods, e.g. relativistic Hartree-Fock, the Thomas-Fermi-Dirac potential, and Dirac-Fock computation of A-values and R-matrix with intermediate coupling frame transformation and Dirac R-matrix. We study the advantages and shortcomings of each method.
The obtained spectral data is then benchmarked against observed astronomical spectra. It has been found that the Dirac R-matrix collision strengths yield excellent agreement with observations. By contrast, LS-coupling R-matrix results fail to yield accurate effective collision strengths at around 104 K, despite using very large configuration expansions, because of the limited treatment of spin-orbit effects in the near threshold resonances of the collision strengths.
The present models are in very good agreement with observed emission spectra, in contrast with previous models. The present work demonstrates that accurate atomic data for low ionization iron-peak species is now within reach.
Ballance Connor
Bautista Manuel
Fivet V.
Quinet Pascal
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