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

中国物理B ›› 2019, Vol. 28 ›› Issue (10): 103103-103103.doi: 10.1088/1674-1056/ab4043

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

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

Moussaoui Abdelaziz, Alioua Kamel, Allouche Abdul-rahman, Bouledroua Moncef

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

收稿日期:2019-06-18 修回日期:2019-08-23 出版日期:2019-10-05 发布日期:2019-10-05
通讯作者: Alioua Kamel E-mail:kamel.alioua@univ-soukahras.dz

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

Moussaoui Abdelaziz¹, Alioua Kamel^1,2, 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

Received:2019-06-18 Revised:2019-08-23 Online:2019-10-05 Published:2019-10-05
Contact: Alioua Kamel E-mail:kamel.alioua@univ-soukahras.dz

摘要/Abstract

摘要： 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.

关键词: absorption coefficient, emission coefficient, pressure broadening, potential curves

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.

Key words: absorption coefficient, emission coefficient, pressure broadening, potential curves

中图分类号: (Photoionization and excitation)

32.80.-t

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)

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[J]. 中国物理B, 2019, 28(10): 103103-103103.

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

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

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