Speaker
Description
There are several computer packages such as HULLAC, FAC, AMBIT, GRASP, COWAN CODE for atomic structure calculations, each having their strengths and weaknesses [1-5]. Here we give an account for GRASP: theory, methodology, and issues of program handling [6,7]. Through a number examples, we discuss the applicability of GRASP for atomic systems of different complexity of relevance for astrophysics. Of special importance is the issue of uncertainty of the calculated energy levels and of the corresponding transition rates. At the end we discuss some future prospects of atomic structure calculations.
References:
[1] A Bar-Shalom, J Oreg, and M Klapisch, J. Quant. Spectros. Rad. Transf. 65, 43 (2000).
[2] M.F. Gu, Canadian Journal of Physics, vol. 86, issue 5, pp. 675-689 (2008).
[3] E.V. Kahl, J.C Berengut, Computer Physics Communications, vol. 238, pp. 232-243 (2019).
[4] C. Froese Fischer, et al., Computer Physics Communications, vol. 237, pp. 184-187 (2019).
[5] R.D. Cowan, The Theory of Atomic Structure and Spectra; University of California Press: Berkeley, CA, USA, (1981).
[6] P. Jönsson et al. Atoms, vol. 11(1), 7 (2023).
[7] P. Jönsson et al. Atoms, vol. 11(4), 68 (2023).
