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Mabrouk N, Dhiflaoui J, Saidi S, Bejaoui M, Alharzali N, Berriche H. Potential Energy Surface and Bound States of Ne-Li 2+( X2Σ g+) van der Waals Complex Based on Ab Initio Calculations. J Phys Chem A 2023; 127:9167-9177. [PMID: 37890154 PMCID: PMC10641847 DOI: 10.1021/acs.jpca.3c03811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 10/07/2023] [Accepted: 10/10/2023] [Indexed: 10/29/2023]
Abstract
Theoretical studies of the potential energy surface and vibrational bound states calculations were performed for the ground state of the Ne-Li2+(X2Σg+) van der Waals (vdW) complex. The intermolecular interactions were investigated by using an accurate monoconfigurational RCCSD(T) method and large basis sets (aug-cc-pVnZ, n = T, Q, 5), extrapolated to the complete basis set (CBS) limit. In turn, the obtained raw data from RCCSD(T)/CBS(Q5) calculations were numerically interpolated using the Morse + vdW model and the Reproducing Kernel Hilbert Space (RKHS) polynomial method to generate analytic expressions for the 2D-PES. The RKHS interpolated PES was then used to assess the bound states of the Ne-Li2+(X2Σg+) system through nuclear quantum calculations. By studying the aspect of the potential energy surface, the analysis sheds light on the behavior of the Ne-Li2+(X2Σg+) complex and its interactions between repulsive and attractive forces with other particles. By examining the vibrational states and wave functions of the system, the researchers were able to gain a better understanding of the behavior of the Ne-Li2+(X2Σg+) complex. The calculated radial and angular distributions for all even and odd symmetries are discussed in detail. We observe that the radial distributions exhibit a more complicated nodal structure, representing stretching vibrational behavior in the neon atom along its radial coordinate. For the highest bound states, the situation is very different, and the energies surpass the angular barrier.
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Affiliation(s)
- Nesrine Mabrouk
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty
of Sciences of Monastir, University of Monastir, Monastir 5019, Tunisia
| | - Jamila Dhiflaoui
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty
of Sciences of Monastir, University of Monastir, Monastir 5019, Tunisia
| | - Samah Saidi
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty
of Sciences of Monastir, University of Monastir, Monastir 5019, Tunisia
- Department
of Physics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 16273, Saudi Arabia
| | - Mohamed Bejaoui
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty
of Sciences of Monastir, University of Monastir, Monastir 5019, Tunisia
| | - Nissrin Alharzali
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty
of Sciences of Monastir, University of Monastir, Monastir 5019, Tunisia
- Department
of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Bratislava 814 99, Slovakia
| | - Hamid Berriche
- Laboratory
of Interfaces and Advanced Materials, Physics Department, Faculty
of Sciences of Monastir, University of Monastir, Monastir 5019, Tunisia
- Mathematics
and Physics Department, School of Arts and Sciences, American University of Ras Al Khaimah, Ras Al-Khaimah 10021, United Arab Emirates
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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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Chu CC, Huang HY, Lin HC, Hsiao YH, Whang TJ, Tsai CC. Observation of the shallow 2 Π 1 state of NaH. J Chem Phys 2019; 150:024303. [PMID: 30646708 DOI: 10.1063/1.5065460] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The 2 1Π state of NaH has been observed up to the last bound vibrational level using pulsed optical-optical double resonance fluorescence depletion spectroscopy. A total of 20 rovibrational energy levels ( v = 2-4 and J = 1-9) were assigned to this electronic state by means of comparing the successive rovibrational spectra to the eigenvalues of the ab initio potential energy curve. The decrease of background fluorescence near the atomic asymptotic limit Na(3d) + H(1s) is an indication of reaching the dissociation limit of the NaH 2 1Π state. Unobserved rovibrational levels ( v = 0 and 1) are due to poor Franck-Condon overlap of 2 1Π ← A 1Σ+ transition within the accessible rovibrational levels of intermediate A 1Σ+ state of this work.
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Affiliation(s)
- Chia-Ching Chu
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan
| | - Hsien-Yu Huang
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan
| | - Hsiang-Chin Lin
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan
| | - Yi-Hsiang Hsiao
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan
| | - Thou-Jen Whang
- Department of Chemistry, National Cheng Kung University, Tainan 70101, Taiwan
| | - Chin-Chun Tsai
- Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
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Arndt PT, Sovkov VB, Ma J, Pan X, Beecher DS, Tsai JY, Guan Y, Lyyra AM, Ahmed EH. The Rb 2 3 1Π g state: Observation and analysis. J Chem Phys 2018; 149:224303. [PMID: 30553240 DOI: 10.1063/1.5058282] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This paper reports observations and analysis of the Rb2 31Π g state. A total of 323 rovibrational term values spanning the range of the rotational quantum number J = 7 through 77 and the vibrational quantum number v = 2 through 23 (about 1/3 of the potential well depth) were measured using the optical-optical double resonance technique. The term values are simulated within a model of a piece-wise multi-parameter potential energy function based on the generalized splines. This function not only enables a reproduction of the experimental data with a reasonable quality but also approximates the available ab initio function in its whole range with a uniform accuracy.
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Affiliation(s)
- Phillip T Arndt
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
| | - Vladimir B Sovkov
- St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Jie Ma
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, College of Physics and Electronics, Shanxi University, Taiyuan 030006, China
| | - Xinhua Pan
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
| | - David S Beecher
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
| | - Jeng Y Tsai
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
| | - Yafei Guan
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
| | - A Marjatta Lyyra
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
| | - Ergin H Ahmed
- Physics Department, Temple University, Philadelphia, Pennsylvania 19122-6082, USA
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Shundalau M, Pitsevich G, Malevich A, Hlinisty A, Minko A, Ferber R, Tamanis M. Ab initio multi-reference perturbation theory calculations of the ground and low-lying electronic states of the KRb molecule. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.04.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Softley T. Announcement of the winner of the Longuet-Higgins Young Author's Prize 2012. Mol Phys 2013. [DOI: 10.1080/00268976.2013.814975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kim JT, Lee Y, Kim B, Wang D, Gould PL, Eyler EE, Stwalley WC. Spectroscopic investigation of the A and 3 1Σ+ states of 39K85Rb. J Chem Phys 2012; 137:244301. [PMID: 23277930 DOI: 10.1063/1.4771661] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
By using a combination of molecular beam (MB) excitation spectra and two distinct ultracold molecule excitation spectra (UM+ and UM-), we have assigned high vibrational levels of the A and 3 (1)Σ(+) states from absorption spectra of the mutually strongly perturbed A (1)Σ(+) - 3 (1)Σ(+) - 1 (1)Π - 2 (3)Σ(+) - b (3)Π states of ultracold (39)K(85)Rb molecules in the energy region between 15,116 and 16,225 cm(-1) above the minimum of the ground X (1)Σ(+) state. The ultracold molecules (UM+ and UM-) are formed by radiative decay following photoassociation (PA) to a specific level of the 3(0(+)) state (UM+) or to a specific level of the 3(0(-)) state (UM-). We observe that the A and 3 (1)Σ(+) states are observable in the UM+ spectra, but absent from the UM- spectra. This is explained by considering Hund's case (c) selection rules and transition dipole moments between the upper excited A (1)Σ(+) (2(0(+))) state and the three Ω components (0(+), 0(-), and 1) at the ground-state dissociation limit. We propose further investigations of the extended potential wells of the A and 3 (1)Σ(+) states by combining short-range MB excitation spectra in a narrow Franck-Condon (FC) window near R(e) of the X (1)Σ(+) state, and long-range UM (and PA) excitation spectra, which have much larger FC windows.
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Affiliation(s)
- Jin-Tae Kim
- Department of Photonic Engineering, Chosun University, Gwangju 501-759, Korea
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