Theoretical investigation of the pressure broadening D1 and D2 lines of cesium atoms colliding with ground-state helium atoms

doi:10.1088/1674-1056/ab4043

Abstract Full quantum mechanical calculations are performed to determine the broadening in the far wings of the cesium D₁ and D₂ line shapes arising from elastic collisions of Cs atom with inert helium atoms. The potential energy curves of the low-lying CsHe molecular states, as well as the related transition dipole moments, are carefully computed from ab initio methods based on state-averaged complete active space self-consistent field-multireference configuration interaction (SA-CASSCF-MRCI) calculations, involving the spin-orbit effect, and taking into account the Davidson and BSSE corrections. The absorption and emission reduced coefficients are determined in the temperature and wavelength ranges of 323-3000 K and 800-1000 nm, respectively. Both profiles of the absorption and the emission are dominated by the free-free transitions, and exhibit a satellite peak in the blue wing near the wavelength 825 nm, attributed to B²Σ_1/2⁺→X²Σ_1/2⁺ transitions. The results are in good agreement with previous experimental and theoretical works.

Keywords: absorption coefficient emission coefficient pressure broadening potential curves

Received: 18 June 2019
Revised: 23 August 2019
Accepted manuscript online:

PACS:	32.80.-t	(Photoionization and excitation)
	31.50.Bc	(Potential energy surfaces for ground electronic states)
	31.50.Df	(Potential energy surfaces for excited electronic states)
	32.70.Jz	(Line shapes, widths, and shifts)

Corresponding Authors: Alioua Kamel
E-mail: kamel.alioua@univ-soukahras.dz

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Moussaoui Abdelaziz, Alioua Kamel, Allouche Abdul-rahman, Bouledroua Moncef Theoretical investigation of the pressure broadening D₁ and D₂ lines of cesium atoms colliding with ground-state helium atoms 2019 Chin. Phys. B 28 103103

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Theoretical investigation of the pressure broadening D1 and D2 lines of cesium atoms colliding with ground-state helium atoms

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Theoretical investigation of the pressure broadening D₁ and D₂ lines of cesium atoms colliding with ground-state helium atoms