Abstract
In this theoretical study, we have conducted calculations to investigate the pressure broadening of the and the lines of the calcium ion in a gas of ground-state He helium atoms. The focus of our work is to determine the profiles of the pressure-broadened resonance lines and analyse their behaviour under the influence of binary collisions between ions and He atoms. To achieve this, we constructed accurate potential energy curves for the ground and the excited and E states. Additionally, we constructed the corresponding transition dipole moments based on the data obtained through high-level ab initio methods, including SA-CASSCF, MRCI, and SO coupling, with Davidson and BSSE corrections. The study spans a range of temperatures from to and wavelengths from to . The theoretical profile is characterised by dominant free-free transitions. In the vicinity of the wavelength position, there is a satellite peak in the red wing, attributed to the contribution of and transitions. Our findings are in good agreement with previous theoretical results.
Disclosure statement
No potential conflict of interest was reported by the author(s).