Theoretical Aspects of HULLAC
Abstract
Hullac is an integrated code for calculating atomic structure and cross sections for collisional and radiative atomic processes, aimed at complex spectra of heavy ionized atoms. It is based on relativistic quantum mechanical calculations including configuration interaction. The collisional cross sections are calculated in the distorted wave approximation. The target and continuum wavefunctions are obtained consistently. The theory and algorithms are presented, emphasizing the various novel methods that were developed to obtain accurate results very efficiently. In particular we describe the Parametric Potential method used for both bound and free orbitals, and the Njgraf graphical method used in the calculation of the angular momentum part of the matrix elements. Collision cross sections are obtained extremely efficiently, thanks to the FactorizationInterpolation method applied in the derivation of collisional rates, and the Phase Amplitude approach for calculating the continuum orbitals. Special effort was devoted to ensure the simplicity of use.
 Publication:

Atomic Processes in Plasmas
 Pub Date:
 October 2002
 DOI:
 10.1063/1.1516299
 Bibcode:
 2002AIPC..635...92B
 Keywords:

 Atomic Collisions;
 Atomic Physics;
 Atomic Structure;
 Configuration Interaction;
 Particle Collisions;
 Plasma Control;
 Plasmas (Physics);
 Relativistic Theory;
 Scattering;
 Simulation;
 52.25.Tx;
 52.25.Os;
 52.20.Hv;
 31.30.Jv;
 Plasma Physics;
 Emission absorption and scattering of particles;
 Emission absorption and scattering of electromagnetic radiation;
 Atomic molecular ion and heavyparticle collisions;
 Relativistic and quantum electrodynamic effects in atoms and molecules