Database NORAD-Atomic-Data for Atomic Processes in Plasma

Abstract

The online atomic database of NORAD-Atomic-Data, where NORAD stands for Nahar OSU Radiative, is part of the data sources of the two international collaborations of the Opacity Project (OP) and the Iron Project (IP). It contains large sets of parameters for the dominant atomic processes in astrophysical plasmas, such as, (i) photo-excitation, (ii) photoionization, (iii) electron–ion recombination, (iv) electron–impact excitations. The atomic parameters correspond to tables of energy levels, level-specific total photoionization cross-sections, partial photoionization cross-sections of all bound states for leaving the residual ion in the ground state, partial cross-sections of the ground state for leaving the ion in various excited states, total level-specific electron–ion recombination rate coefficients that include both the radiative and dielectronic recombination, total recombination rate coefficients summed from contributions of an infinite number of recombined states, total photo-recombination cross-sections and rates with respect to photoelectron energy, transition probabilities, lifetimes, collision strengths. The database was created after the first two atomic databases, TOPbase under the OP and TIPbase under the IP. Hence the contents of NORAD-Atomic-Data are either new or from repeated calculations using a much larger wave function expansion making the data more complete. The results have been obtained from the R-matrix method using the close-coupling approximation developed under the OP and IP, and from atomic structure calculations using the program SUPERSTRUCTURE. They have been compared with available published results which have been obtained theoretically and experimentally, and are expected to be of high accuracy in general. All computations were carried out using the computational facilities at the Ohio Supercomputer Center (OSC) starting in 1990. At present it contains atomic data for 154 atomic species, 98 of which are lighter atomic species with nuclear charge Z ≤ 28 and 56 are heavier ones with Z > 28. New data are added with publications.

Structure Calculations in Nd III and U III Relevant for Kilonovae Modelling

“…Only the data from Savukov et al [26], which used a hybrid configuration interaction (CI) plus linearized coupled cluster (LCC) methods described in [27], are publicly available. Sultana N. Nahar of the Ohio State University's Astronomy Department hosts and maintains the NORAD-Atomic-Data database [28], which contains calculations for a broad range of structure calculations for important astrophysical ions, including uranium, using the SUPERSTRUCTURE [29] algorithm. In that database, however, only highly ionized elements are available.…”

Photoionization and Electron-Ion Recombination of n = 1 to Very High n-Values of Hydrogenic Ions

“…7. All atomic data and the program will be available online at database, NORAD-Atomic-Data ( [24], http://norad.astronomy.ohio-state.edu (accessed on 1 September 2007)).…”

“…Seaton's cross sections were not published, but are available at the OP database, TOPbase [22]. Atomic data for the same levels with n = 1 -10 are also available with a finer energy mesh at the database NORAD-Atomic-Data [23,24].…”

Experimental and Theoretical Study of Photoionization of Cl III

“…The apparently large abundance of chlorine in the interstellar medium is an unresolved question in astrophysics [5] prompting the need for more investigations into the fundamental properties of this element. In general, measurements of photoionization spectra of ions of chlorine [6] have helped in benchmarking theoretical efforts such as those of the OPACITY [7][8][9], IRON [10], and NORAD [11] projects that have for several decades focused on understanding the interaction of photons with ions.…”