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Mabrouk N, Dhiflaoui J, Bejaoui M, Saidi S, Berriche H. Pairwise Model Potential and DFT Study of Li+Nen Clusters ( n = 1-20): The Structural, Electronic, and Thermodynamic Properties. ACS OMEGA 2023; 8:41438-41450. [PMID: 37970048 PMCID: PMC10633865 DOI: 10.1021/acsomega.3c05238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 10/06/2023] [Accepted: 10/11/2023] [Indexed: 11/17/2023]
Abstract
The structural properties, relative stabilities, electronic, and thermodynamic properties, of Li+Nen (n = 1-20) clusters have been studied based on a pairwise model and density functional theory (DFT) methods. In the pairwise method, the potential energy surface considered interactions between Li+Ne, Ne - Ne, and many-body term. For the DFT calculations, the B3LYP functional combined with the 6-311 + + G (2d,2p) basis sets has been employed. In both methods, the Li+Ne6 cluster demonstrated high stability with an octahedral structure, where the Li+ cation was surrounded by Ne atoms. Thus, the octahedral Li+Ne6 structure was considered to be the core for larger cluster sizes. Relative stabilities were assessed based on binding energies, second-order differences of energies, transition dipole moment, and HOMO-LUMO energy gaps. Furthermore, thermodynamic properties were calculated, revealing that the formation process of Li+Nen clusters is endothermic and nonspontaneous.
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Affiliation(s)
- Nesrine Mabrouk
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty of Sciences of Monastir, Avenue de l’Environnement, Monastir 5019, Tunisia
| | - Jamila Dhiflaoui
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty of Sciences of Monastir, Avenue de l’Environnement, Monastir 5019, Tunisia
| | - Mohamed Bejaoui
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty of Sciences of Monastir, Avenue de l’Environnement, Monastir 5019, Tunisia
| | - Samah Saidi
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty of Sciences of Monastir, Avenue de l’Environnement, Monastir 5019, Tunisia
- Department
of Physics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 16273, Saudi Arabia
| | - Hamid Berriche
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty of Sciences of Monastir, Avenue de l’Environnement, Monastir 5019, Tunisia
- Mathematics
and Physics Department, School of Arts and Sciences, American University of Ras Al Khaimah, Ras Al-Khaimah 10021, UAE
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Spectroscopy of Alkali Atoms in Solid Matrices of Rare Gases: Experimental Results and Theoretical Analysis. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12136492] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
We present an experimental and theoretical investigation of the spectroscopy of dilute alkali atoms in a solid matrix of inert gases at cryogenic temperatures, specifically Rubidium atoms in a solid Argon or Neon matrix, and related aspects of the interaction energies between the alkali atoms and the atoms of the solid matrix. The system considered is relevant for matrix isolation spectroscopy, and it is at the basis of a recently proposed detector of cosmological axions, exploiting magnetic-type transitions between Zeeman sublevels of alkali atoms in a magnetic field, tuned to the axion mass, assumed in the meV range. Axions are one of the supposed constituents of the dark matter (DM) of the Universe. This kind of spectroscopy could be also relevant for the experimental search of new physics beyond the Standard Model, in particular the search of violations of time-reversal or parity-charge-conjugation (CP) symmetry. In order to efficiently resolve the axion-induced transition in alkali-doped solid matrices, it is necessary to reduce as much as possible the spectral linewidth of the electronic transitions involved. The theoretical investigation presented in this paper aims to estimate the order of magnitude of the inhomogeneous contribution to the linewidth due to the alkali–matrix interactions (Coulomb/exchange and dispersion), and to compare the theoretical results with our experimental measurements of spectra of dilute Rubidium atoms in Argon and Neon solid matrix. The comparison of the expected or measured spectral linewidths will be important for selecting the most appropriate combination of alkali atoms and matrix inert elements to be used in the proposed axion detection scheme. It is finally suggested that dilute Lithium atoms diffused in a cold parahydrogen solid matrix could be, overall, a good system upon which the proposed detector could be based.
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Spectroscopic, vibrational and structural properties analysis of CaXen (n = 1–4) clusters. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Gervais B, Zanuttini D, Douady J. Spin-orbit coupling in the dissociative excitation of alkali atoms at the surface of rare gas clusters: A theoretical study. J Chem Phys 2016; 144:194307. [PMID: 27208949 DOI: 10.1063/1.4948814] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
We analyze the role of the spin-orbit (SO) coupling in the dissociative dynamics of excited alkali atoms at the surface of small rare gas clusters. The electronic structure of the whole system is deduced from a one-electron model based on core polarization pseudo-potentials. It allows us to obtain in the same footing the energy, forces, and non-adiabatic couplings used to simulate the dynamics by means of a surface hopping method. The fine structure state population is analyzed by considering the relative magnitude of the SO coupling ξ, with respect to the spin-free potential energy. We identify three regimes of ξ-values leading to different evolution of adiabatic state population after excitation of the system in the uppermost state of the lowest np (2)P shell. For sufficiently small ξ, the final population of the J=12 atomic states, P12, grows up linearly from P12=13 at ξ = 0 after a diabatic dynamics. For large values of ξ, we observe a rather adiabatic dynamics with P12 decreasing as ξ increases. For intermediate values of ξ, the coupling is extremely efficient and a complete transfer of population is observed for the set of parameters associated to NaAr3 and NaAr4 clusters.
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Affiliation(s)
- B Gervais
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen Cedex 05, France
| | - D Zanuttini
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen Cedex 05, France
| | - J Douady
- CIMAP, Unité Mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen Cedex 05, France
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Abdessalem K, Habli H, Ghalla H, Yaghmour SJ, Calvo F, Oujia B. Many-body effects on the structures and stability of Ba2+Xen(n= 1–39, 54) clusters. J Chem Phys 2014; 141:154308. [DOI: 10.1063/1.4896607] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Galbis E, Douady J, Jacquet E, Giglio E, Gervais B. Potential energy curves and spin-orbit coupling of light alkali-heavy rare gas molecules. J Chem Phys 2013; 138:014314. [PMID: 23298048 DOI: 10.1063/1.4773019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The potential energy curves of the X, A, and B states of alkali-rare gas diatomic molecules, MKr and MXe, are investigated for M = Li, Na, K. The molecular spin-orbit coefficients a(R)=<(2)Π(½)|Ĥ(SO)|(2)Π(½)> and b(R)=<(2)Π(-½)|Ĥ(SO)|(2)Σ(½)> are calculated as a function the interatomic distance R. We show that a(R) increases and b(R) decreases as R decreases. This effect becomes less and less important as the mass of the alkali increases. A comparison of the rovibrational properties deduced from our calculations with experimental measurements recorded for NaKr and NaXe shows the quality of the calculations.
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Affiliation(s)
- E Galbis
- CIMAP, unité mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen, Cedex 05, France
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Jacquet E, Zanuttini D, Douady J, Giglio E, Gervais B. Spectroscopic properties of alkali atoms embedded in Ar matrix. J Chem Phys 2011; 135:174503. [DOI: 10.1063/1.3655467] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Zanuttini D, Douady J, Jacquet E, Giglio E, Gervais B. Nonadiabatic molecular dynamics of photoexcited Li2(+) Ne(n) clusters. J Chem Phys 2011; 134:044308. [PMID: 21280726 DOI: 10.1063/1.3532769] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the relaxation of photoexcited Li(2)(+) chromophores solvated in Ne(n) clusters (n = 2-22) by means of molecular dynamics with surface hopping. The simplicity of the electronic structure of these ideal systems is exploited to design an accurate and computationally efficient model. These systems present two series of conical intersections between the states correlated with the Li+Li(2s) and Li+Li(2p) dissociation limits of the Li(2)(+) molecule. Frank-Condon transition from the ground state to one of the three lowest excited states, hereafter indexed by ascending energy from 1 to 3, quickly drives the system toward the first series of conical intersections, which have a tremendous influence on the issue of the dynamics. The states 1 and 2, which originate in the Frank-Condon area from the degenerated nondissociative 1(2)Π(u) states of the bare Li(2)(+) molecule, relax mainly to Li+Li(2s) with a complete atomization of the clusters in the whole range of size n investigated here. The third state, which originates in the Frank-Condon area from the dissociative 1(2)Σ(u)(+) state of the bare Li(2)(+) molecule, exhibits a richer relaxation dynamics. Contrary to intuition, excitation into state 3 leads to less molecular dissociation, though the amount of energy deposited in the cluster by the excitation process is larger than for excitation into state 1 and 2. This extra amount of energy allows the system to reach the second series of conical intersections so that approximately 20% of the clusters are stabilized in the 2(2)Σ(g)(+) state potential well for cluster sizes n larger than 6.
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Affiliation(s)
- D Zanuttini
- CIMAP, unité mixte CEA-CNRS-ENSICAEN-UCBN 6252 BP 5133, F-14070 Caen, Cedex 05, France
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Zanuttini D, Douady J, Jacquet E, Giglio E, Gervais B. Structure and photoabsorption properties of cationic alkali dimers solvated in neon clusters. J Chem Phys 2010; 133:174503. [DOI: 10.1063/1.3490251] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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