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Alharzali N, Berriche H, Villarreal P, Prosmiti R. Theoretical Study of Cationic Alkali Dimers Interacting with He: Li 2+-He and Na 2+-He van der Waals Complexes. J Phys Chem A 2019; 123:7814-7821. [PMID: 31442041 DOI: 10.1021/acs.jpca.9b05551] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present a theoretical study on the potential energy surface and bound states of He-A2+ complexes, where A is one of the alkali Li or Na atoms. The intermolecular interactions were systematically investigated by high-level ab initio electronic structure computations, and the corresponding raw data were then employed to reproduce accurate analytical expressions of the potential surfaces. In turn, we used these potentials to evaluate bound configurations of the trimers from nuclear quantum calculations and to extract information on the effect of orientational anisotropy of the forces and the interplay between repulsive and attractive interaction within the potential surfaces. The spatial features of the bound states are analyzed and discussed in detail. We found that both systems are going under large amplitude stretching and bending motions with high zero-point energies. Despite the large differences in the potential well-depths, the correct treatment of nuclear quantum effects provides insights on the effect of different strength of the ionic interaction on the spectral structure of such cationic alkali van der Waals complexes, related to the mobility of ions and the formation of cold-molecules in He-controlled environments.
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Affiliation(s)
- Nissrin Alharzali
- Laboratory of Interfaces and Advanced Materials, Faculty of Science , University of Monastir , 5019 Monastir , Tunisia
| | - Hamid Berriche
- Laboratory of Interfaces and Advanced Materials, Faculty of Science , University of Monastir , 5019 Monastir , Tunisia.,Department of Mathematics and Natural Sciences, School of Arts and Sciences , American University of Ras Al Khaimah , RAK , P.O. Box 10021 , UAE
| | - Pablo Villarreal
- Institute of Fundamental Physics (IFF-CSIC) , CSIC , Serrano 123 , 28006 Madrid , Spain
| | - Rita Prosmiti
- Institute of Fundamental Physics (IFF-CSIC) , CSIC , Serrano 123 , 28006 Madrid , Spain
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Affiliation(s)
- Pietro Cremaschi
- a Centro del CNR per lo studio delle relazioni tra struttura e reattività chimica , Via C. Golgi 19, 20133 , Milano , Italy
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