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Ghanmi C, Berriche H. Accurate Ab Initio Investigation of Electronic and Radiative Properties, and Cross Sections for Charged Diatomic Systems FrLi + and FrNa . ACS OMEGA 2023; 8:44977-44987. [PMID: 38046336 PMCID: PMC10688152 DOI: 10.1021/acsomega.3c06338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/12/2023] [Accepted: 10/13/2023] [Indexed: 12/05/2023]
Abstract
This paper presents an extensive ab initio investigation of the electronic properties and elastic collisions of charged diatomic systems FrLi+ and FrNa+. We employ an accurate ab initio approach using nonempirical pseudopotentials for Li+, Na+, and Fr+ cores. We calculate the potential energy curves of the ground state and low-lying excited states of 2Σ+, 2Π, and 2Δ symmetries, identifying and interpreting avoided crossings between higher 2Σ+ and 2Π states. The spectroscopic parameters, transition dipole moments, and vibrational energies associated with 1-32Σ+ states are calculated, along with the radiative lifetimes of the vibrational states trapped in the 22Σ+ state. Using accurate potential energy data, we evaluate partial and total cross sections across a wide range of energies. At low energies (<1 mK), the elastic cross section follows the Wigner law threshold comportment, while at high energies, it scales as E-1/3. To the best of our knowledge, no theoretical or experimental data have been collected on these charged diatomic systems until now. Hence, we proceeded to analyze our findings by comparing them with data acquired from comparable systems. The information pertaining to electronic structures, spectroscopic parameters, transition properties, and collision data provided in this work is expected to serve as a valuable guideline for future theoretical and experimental research on each considered system.
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Affiliation(s)
- Chedli Ghanmi
- 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 Physics, School of Arts and Sciences, Ras Al Khaimah American University, Ras Al Khaimah 10021, UAE
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Abstract
AbstractWe have measured depletion spectra of the heteronuclear (85Rb87Rb+) dimer cation complexed with up to 10 He atoms. Two absorption bands are observed between 920 and 250 nm. The transition into the repulsive 12Σu+state of HeRb2+gives rise to a broad feature at 790 nm (12,650 cm−1); it exhibits a blueshift of 98 cm−1per added He atom. The transition into the bound 12Πustate of HeRb2+reveals vibrational structure with a band head at ≤ 15,522 cm−1, a harmonic constant of 26 cm−1, and a spin–orbit splitting of ≤ 183 cm−1. The band experiences an average redshift of − 38 cm−1per added He atom. Ab initio calculations rationalize the shape of the spectra and spectral shifts with respect to the number of helium atoms attached. For a higher number of solvating helium atoms, symmetric solvation on both ends of the Rb2+ion is predicted.
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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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Potential Energy Curves for the LiK + and NaK + Molecular Ions With the Coupled Cluster Method. ADVANCES IN QUANTUM CHEMISTRY 2018. [DOI: 10.1016/bs.aiq.2017.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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Bewicz A, Musiał M, Kucharski SA. Potential energy curves of the Na2+ molecular ion from all-electron ab initio relativistic calculations. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1292010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Anna Bewicz
- Institute of Chemistry, University of Silesia, Katowice, Poland
| | - Monika Musiał
- Institute of Chemistry, University of Silesia, Katowice, Poland
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Skupin P, Musiał M, Kucharski SA. Potential Energy Curves for the Low-Lying Electronic States of K2+ from ab Initio Calculations with All Electrons Correlated. J Phys Chem A 2017; 121:1480-1486. [DOI: 10.1021/acs.jpca.6b09920] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Patrycja Skupin
- Institute of Chemistry University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Monika Musiał
- Institute of Chemistry University of Silesia, Szkolna 9, 40-006 Katowice, Poland
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Al-dossary OM, Khelifi N. Theoretical study of LiK and LiK+ in adiabatic representation. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2013. [DOI: 10.1134/s0036024414010336] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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On the dissociation energy of positively charged species. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.09.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Deiglmayr J, Repp M, Grochola A, Mörtlbauer K, Glück C, Dulieu O, Lange J, Wester R, Weidemüller M. Formation of ultracold dipolar molecules in the lowest vibrational levels by photoassociation. Faraday Discuss 2009; 142:335-49; discussion 429-61. [DOI: 10.1039/b818391k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lim IS, Schwerdtfeger P, Söhnel T, Stoll H. Ground-state properties and static dipole polarizabilities of the alkali dimers from K2n to Fr2n(n=0,+1) from scalar relativistic pseudopotential coupled cluster and density functional studies. J Chem Phys 2005; 122:134307. [PMID: 15847465 DOI: 10.1063/1.1869979] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The newly adjusted energy-consistent nine-valence-electron pseudopotentials for K to Fr are used to calculate spectroscopic properties for the neutral and positively charged alkali dimers using coupled cluster and density functional theory. For the neutral dimers the static dipole polarizability was calculated. The coupled cluster results are all in excellent agreement with experimental values. The density functionals used can give quite different spectroscopic properties especially for the dipole polarizability, with the Perdew-Wang PW91 functional performing best.
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Affiliation(s)
- Ivan S Lim
- Theoretical and Computational Chemistry Research Center (TCCRC), Institute of Fundamental Sciences, Massey University (Albany Campus), Private Bag 102904, North Shore MSC, Auckland, New Zealand
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Gil A, Bertran J, Sodupe M. Gas phase dissociation energies of saturated AHn*+ radical cations and AHn neutrals (A = Li-F, Na-Cl): dehydrogenation, deprotonation, and formation of AHn-2*+ - H2 complexes. J Am Chem Soc 2003; 125:7461-9. [PMID: 12797821 DOI: 10.1021/ja0295927] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dissociation energies corresponding to the two possible A-H cleavages of A (A = Li-F and Na-Cl) radical cations (loss of a H(+) and loss of a H(.)) have been computed at the CCSD(T)/ 6-311++G(3df,2pd) level of theory and compared to those of their neutral precursors. Removing an electron from AH(n)() decreases dramatically its deprotonation energy, especially for the A molecules (C and ), which become one of the most acidic species of the row, their acid character being only exceeded by FH(.+) and ClH(.+), respectively. However, dehydrogenation energies only decrease for the systems on the left side of the row (up to C and SiH(4)(.+)) for which the electron is removed from a A-H bonding orbital. Nevertheless, the loss of hydrogen is the more favorable cleavage in all cases except FH(.+). Ionization of SiH(4) leads to a Jahn-Teller distorted structure that corresponds to a Si - H(2) complex. Other - eta(2)H(2) complexes in the doublet spin state have also been found to be stable for A = Be, Mg, Al, and P, the hydrogen molecule complexes being more stable than their corresponding radical cations, for Be, Mg, and Al.
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Affiliation(s)
- Adrià Gil
- Contribution from the Departament de Química, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain
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Patil SH, Tang KT. Simple model potential and model wave functions for (Na, K, Rb, Cs)–H molecules. J Chem Phys 2003. [DOI: 10.1063/1.1545677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Petrie S. Calculated Bond Energies of Gas-Phase, Main-Group Metal Ions with Small Hydrocarbon Radicals. J Phys Chem A 2002. [DOI: 10.1021/jp020433j] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simon Petrie
- School of Chemistry, University College, University of New South Wales, ADFA, Canberra, ACT 2600 Australia, and Department of Chemistry, the Faculties, Australian National University, Canberra, ACT 0200 Australia
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