Full-quantum calculations of the pressure broadening and lines of Mg magnesium ion in a gas of ground-state He helium atoms

Lamisse Kechradi; Louardi Yandjah; Kamel Alioua; Mohamed Tahar Bouazza

doi:10.1140/epjd/s10053-024-00886-8

2024 Impact factor 1.5

Atomic, Molecular, Optical and Plasma Physics

Eur. Phys. J. D (2024) 78: 89
https://doi.org/10.1140/epjd/s10053-024-00886-8

Regular Article - Molecular Physics and Chemical Physics

Full-quantum calculations of the pressure broadening $D_{1}$ $D_{1}$ and $D_{2}$ $D_{2}$ lines of Mg $^{+}$ $^{+}$ magnesium ion in a gas of ground-state He helium atoms

Lamisse Kechradi¹^,2, Louardi Yandjah¹, Kamel Alioua¹^,2^c and Mohamed Tahar Bouazza³

¹ Université Chérif Messaidia, B.P. 1553, 41000, Souk-Ahras, Algeria
² Laboratoire de Physique de la Matière et du Rayonnement LPMR, Université Chérif Messaidia, B. P. 1553, 41000, Souk-Ahras, Algeria
³ Badji Mokhtar University, B.P. 12, Annaba, Algeria

^c kamel.alioua@univ-soukahras.dz

Received: 4 April 2024
Accepted: 18 June 2024
Published online: 5 July 2024

Abstract

In this theoretical investigation, we have performed comprehensive quantum calculations to explore the pressure broadening effects on the $D_{1} (3 s^{2} S_{1 / 2} - 3 p^{2} P_{1 / 2})$ $D_{1}\left( 3\,s\text { }^{2}S_{1/2}-3p\text { }^{2}P_{1/2}\right)$ and $D_{2} (3 s^{2} S_{1 / 2} - 3 p^{2} P_{3 / 2})$ $D_{2}\left( 3\,s \text { }^{2}S_{1/2}-3p\text { }^{2}P_{3/2}\right)$ lines of the Mg $^{+}$ $^{+}$ magnesium ion when surrounded by ground-state He helium atoms. Our objective is to delineate the profiles of these pressure-broadened resonance lines and scrutinize their behavior in response to binary collisions between Mg $^{+}$ $^{+}$ ions and He atoms. To accomplish this goal, we developed precise potential energy curves for the ground $X^{2} Σ_{1 / 2}^{+}$ $X\ ^{2}\Sigma _{1/2}^{+}$ and the excited $A^{2} Π_{1 / 2}, A^{2} Π_{3 / 2}$ $A^{2}\Pi _{1/2},A^{2}\Pi _{3/2}$ and B $^{2} Σ_{1 / 2}^{+}$ $^{2}\Sigma _{1/2}^{+}$ , along with the associated transition dipole moments, using data derived from advanced ab initio methodologies such as SA-CASSCF, MRCI, and SO coupling, with Davidson and BSSE corrections. Our investigation encompasses a temperature range from 4000 to $12000 K$ $12000 \,\textrm{K}$ and wavelengths spanning from 200 to $450 nm$ $450\,\textrm{nm}$ . The theoretical profiles primarily exhibit dominant free-free transitions. Notably, around the $235 nm$ $235\,\textrm{nm}$ wavelength region, a satellite peak appears in the blue wing, attributed to the B $^{2} Σ_{1 / 2}^{+} ⟵ X^{2} Σ_{1 / 2}^{+}$ $^{2}\Sigma _{1/2}^{+}\longleftarrow X\ ^{2}\Sigma _{1/2}^{+}$ transitions. We have confirmed agreement between our theoretical findings and prior research.

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Full-quantum calculations of the pressure broadening D1 and D2 lines of Mg+ magnesium ion in a gas of ground-state He helium atoms

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Full-quantum calculations of the pressure broadening $D_{1}$ $D_{1}$ and $D_{2}$ $D_{2}$ lines of Mg $^{+}$ $^{+}$ magnesium ion in a gas of ground-state He helium atoms