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Chin. Phys. B, 2019, Vol. 28(10): 103103    DOI: 10.1088/1674-1056/ab4043
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

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

Moussaoui Abdelaziz1, Alioua Kamel1,2, Allouche Abdul-rahman3, Bouledroua Moncef4
1 Université Chérif Messaidia, B. P. 1553, Souk-Ahras 41000, Algerie;
2 Laboratoire de Physique de la Matière et du Rayonnement LPMR, Université Chérif Messaidia, B. P. 1553, Souk-Ahras 41000, Algerie;
3 Université Lyon 1, CNRS, LASIM UMR5579, bât. A. Kastler, 43 Bd du 11 novembre 1918, F-69622 Villeurbanne, France;
4 Laboratoire de Physique des Rayonnements LPR, Université Badji Mokhtar, B. P. 12, Annaba 23000, Algerie
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 B2Σ1/2+→X2Σ1/2+ 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      Published:  05 October 2019
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

Cite this article: 

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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