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Electronic structure and spectra of the RbHe van der Waals system including spin orbit interaction

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Abstract

The potential energy interaction, the spectroscopic properties and dipole functions of the RbHe van der Waals dimer have been investigated. We used a one-electron pseudopotential approach and large Gaussian basis sets to represent the two atoms Rb and He. The Rb+ core and the electron-He interactions were replaced by semi-local pseudopotentials and a core-core interaction is included. Therefore, the number of active electrons of RbHe is reduced to only one electron. Consequently, the potential energy curves and dipole moments for many electronic states dissociating into Rb(5s,5p,4d,6s,6p,5d,7s)+He are performed at the SCF level. In addition, the spin-orbit coupling is included in the calculation. The Rb+He interaction, in its ground state, is taken from accurate CCSD (T) calculations and fitted to an analytical expression for a better description of the potential in all internuclear ranges. The spectroscopic properties of the RbHe electronic states are extracted. The comparison of these constants has shown a very good agreement for the ground state as well as for the lower excited states when compared with existing theoretical and experimental studies.

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Authors and Affiliations

  1. Laboratory of Interfaces and Advanced Materials (LIMA), Physics Department, Faculty of Science of Monastir, University of Monastir, Monastir, Tunisia

    Jamila Dhiflaoui, Mohamed Bejaoui & Hamid Berriche

  2. Department of Mathematics and Natural Sciences, School of Arts and Sciences, American University of Ras Al Khaimah, P.O. Box 10021, Ras Al Khaimah, United Arab Emirates

    Hamid Berriche

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  1. Jamila Dhiflaoui
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  2. Mohamed Bejaoui
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  3. Hamid Berriche
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Correspondence to Hamid Berriche.

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Dhiflaoui, J., Bejaoui, M. & Berriche, H. Electronic structure and spectra of the RbHe van der Waals system including spin orbit interaction. Eur. Phys. J. D 71, 331 (2017). https://doi.org/10.1140/epjd/e2017-70576-1

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