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Lepetit B. Computation and analysis of bound vibrational spectra of the neon tetramer using row orthonormal hyperspherical coordinates. J Chem Phys 2020; 153:104302. [PMID: 32933308 DOI: 10.1063/5.0022655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
This paper presents the first implementation of the row-orthonormal hyperspherical coordinate formalism for the computation of the vibrational spectrum of a tetratomic system. The wavefunction of Ne4 is expanded on a large basis set of hyperspherical harmonics generated numerically. This method not only provides spectra with reasonable accuracy, but also gives physical insight into the vibrational dynamics of the system. The characteristics of the spectra are related to the symmetry and localization of the wavefunction in configuration space.
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Affiliation(s)
- Bruno Lepetit
- Laboratoire Collisions, Agrégats, Réactivité, UMR 5589, CNRS-Université Paul Sabatier Toulouse 3, IRSAMC, 31062 Toulouse Cedex 9, France
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2
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Sarka J, Petty C, Poirier B. Exact bound rovibrational spectra of the neon tetramer. J Chem Phys 2019; 151:174304. [PMID: 31703493 DOI: 10.1063/1.5125145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Exact quantum dynamics calculations are performed for the bound rovibrational states of the neon tetramer (Ne4) in its ground electronic state, using pair-wise Lennard-Jones potentials and the ScalIT suite of parallel codes. The vibrational states separate into a low-lying group mostly localized to a single potential well and a higher-energy delocalized group lying above the isomerization threshold-with such a structure serving as a testament to the "intermediate" quantum nature of the Ne4 system. To accurately and efficiently represent both groups of states, the phase-space optimized discrete variable representation (PSO-DVR) approach was used, as implemented in the ScalIT code. The resultant 1D PSO effective potentials also shed significant light on the quantum dynamics of the system. All vibrational states were computed well up into the isomerization band and labeled up to the classical isomerization threshold-defined as the addition of the classical energy of a single bond, ϵ = 24.7 cm-1, to the quantum ground state energy. Rovibrational energy levels for all total angular momentum values in the range J = 1-5 were also computed, treating all Coriolis coupling exactly.
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Affiliation(s)
- János Sarka
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
| | - Corey Petty
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
| | - Bill Poirier
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
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3
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Márquez-Mijares M, Roncero O, Villarreal P, González-Lezana T. Theoretical methods for the rotation–vibration spectra of triatomic molecules: distributed Gaussian functions compared with hyperspherical coordinates. INT REV PHYS CHEM 2018. [DOI: 10.1080/0144235x.2018.1514187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Maykel Márquez-Mijares
- Instituto Superior de Tecnologías y Ciencias Aplicadas InsTec, Havana University, Quinta de los Molinos, Havana, Cuba
| | - Octavio Roncero
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas IFF-CSIC, Madrid, Spain
| | - Pablo Villarreal
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas IFF-CSIC, Madrid, Spain
| | - Tomás González-Lezana
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas IFF-CSIC, Madrid, Spain
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4
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Wu MS, Han HL, Yao C, He XR, Zhang JY, Shi TY. Statistical properties of the rovibrational bound levels for Ar 2Kr. J Chem Phys 2017; 147:054302. [PMID: 28789540 DOI: 10.1063/1.4996561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We calculate the rovibrational bound levels with total angular momentum J = 0, 1 of 40Ar284Kr trimer using the slow variable discretization method combined with the finite-element method-discrete variable representation basis. The statistical distributions of the rovibrational levels for JΠ=0e, 1e, and 1o symmetries are presented and the effects of the Axilrod-Teller potential term are considered. For the 0e and 1e symmetries, the Axilrod-Teller term makes the spectra become fully chaotic. However, for the 1o symmetry, statistical properties depend mainly on the coupling between K = 0 and K = 1 and the Axilrod-Teller term has a small effect.
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Affiliation(s)
- Meng-Shan Wu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Hui-Li Han
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Cui Yao
- College of Physical Science and Technology, Guangxi University, Nanning 530004, China
| | - Xiao-Rong He
- College of Physical Science and Technology, Guangxi University, Nanning 530004, China
| | - Jun-Yi Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Ting-Yun Shi
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
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5
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Brandon D, Poirier B. Accurate calculations of bound rovibrational states for argon trimer. J Chem Phys 2014; 141:034302. [DOI: 10.1063/1.4887459] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Drew Brandon
- Department of Chemistry and Biochemistry, and Department of Physics, Texas Tech University, Box 41061, Lubbock, Texas 79409-1061, USA
| | - Bill Poirier
- Department of Chemistry and Biochemistry, and Department of Physics, Texas Tech University, Box 41061, Lubbock, Texas 79409-1061, USA
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Kalus R, Karlický F, Lepetit B, Paidarová I, Gadea FX. Photoabsorption spectrum of helium trimer cation--theoretical modeling. J Chem Phys 2013; 139:204310. [PMID: 24289357 DOI: 10.1063/1.4832736] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photoabsorption spectrum of He3(+) is calculated for two semiempirical models of intracluster interactions and compared with available experimental data reported in the middle UV range [H. Haberland and B. von Issendorff, J. Chem. Phys. 102, 8773 (1995)]. Nuclear delocalization effects are investigated via several approaches comprising quantum samplings using either exact or approximate (harmonic) nuclear wavefunctions, as well as classical samplings based on the Monte Carlo methodology. Good agreement with the experiment is achieved for the model by Knowles et al., [Mol. Phys. 85, 243 (1995); Mol. Phys. 87, 827 (1996)] whereas the model by Calvo et al., [J. Chem. Phys. 135, 124308 (2011)] exhibits non-negligible deviations from the experiment. Predictions of far UV absorption spectrum of He3(+), for which no experimental data are presently available, are reported for both models and compared to each other as well as to the photoabsorption spectrum of He2(+). A simple semiempirical point-charge approximation for calculating transition probabilities is shown to perform well for He3(+).
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Affiliation(s)
- René Kalus
- Centre of Excellence IT4Innovations and Department of Applied Mathematics, VSB-Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic
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YANG BENHUI, POIRIER BILL. ROVIBRATIONAL BOUND STATES OF THE Ar2Ne COMPLEX. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013. [DOI: 10.1142/s0219633612501076] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We report exact quantum dynamics calculations of the eigenstate energy levels for the bound rovibrational states of the Ar2Ne complex, across the range of J values for which such states are observed (J = 0–35). All calculations have been carried out using the ScalIT suite of parallel codes. These codes employ a combination of highly efficient methods, including phase-space optimized discrete variable representation, optimal separable basis, and preconditioned inexact spectral transform (PIST) methods, together with an effective massive parallelization scheme. The Ar2Ne energy levels were computed using a pair-wise Aziz potential plus a three-body correction, in Jacobi co-ordinates. Effective potentials for the radial co-ordinates are constructed, which reveal important physical insight into the two distinct dissociation pathways, Ar2Ne → NeAr + Ar and Ar2Ne → Ar2 + Ne . A calculation of the bound vibrational (J = 0) levels, computed using the Tang–Toennies potential, is also performed for comparison with results from the previous literature.
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Affiliation(s)
- BENHUI YANG
- Department of Chemistry and Biochemistry and Department of Physics, Texas Tech University, Box 41061, Lubbock, Texas 79409, USA
| | - BILL POIRIER
- Department of Chemistry and Biochemistry and Department of Physics, Texas Tech University, Box 41061, Lubbock, Texas 79409, USA
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8
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Suno H. A theoretical study of Ne3 using hyperspherical coordinates and a slow variable discretization approach. J Chem Phys 2011; 135:134312. [DOI: 10.1063/1.3645183] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Svrčková P, Vítek A, Karlický F, Paidarová I, Kalus R. Theoretical modeling of ionization energies of argon clusters: nuclear delocalization effects. J Chem Phys 2011; 134:224310. [PMID: 21682517 DOI: 10.1063/1.3599052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Temperature dependence of vertical ionization energies is modeled for small argon clusters (N ≤ 13) using classical parallel-tempering Monte Carlo methods and extended interaction models based on the diatomics-in-molecules approach. Quantum effects at the zero temperature are also discussed in terms of zero-point nuclear vibrations, either at the harmonic approximation level or at the fully anharmonic level using the diffusion Monte Carlo calculations. Both approaches lead to a considerable improvement of the theoretical predictions of argon clusters ionization energies and represent a realistic way of modeling of ionization energies for weakly bound and floppy complexes in general. A thorough comparison with a recent electron-impact experiment [O. Echt et al., J. Chem. Phys. 123, 084313 (2005)] is presented and a novel interpretation of the experimental data is proposed.
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Affiliation(s)
- Pavla Svrčková
- Department of Physics, University of Ostrava, 30. dubna 22, 701 03 Ostrava, Czech Republic
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Yang B, Chen W, Poirier B. Rovibrational bound states of neon trimer: Quantum dynamical calculation of all eigenstate energy levels and wavefunctions. J Chem Phys 2011; 135:094306. [PMID: 21913762 DOI: 10.1063/1.3630922] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
- Benhui Yang
- Department of Chemistry and Biochemistry, Texas Tech University, Box 41061, Lubbock, Texas 79409-1061, USA
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11
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Ulrich B, Vredenborg A, Malakzadeh A, Schmidt LPH, Havermeier T, Meckel M, Cole K, Smolarski M, Chang Z, Jahnke T, Dörner R. Imaging of the Structure of the Argon and Neon Dimer, Trimer, and Tetramer. J Phys Chem A 2011; 115:6936-41. [DOI: 10.1021/jp1121245] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- B. Ulrich
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - A. Vredenborg
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - A. Malakzadeh
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - L. Ph. H. Schmidt
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - T. Havermeier
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - M. Meckel
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - K. Cole
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - M. Smolarski
- Department Physik, ETH Zürich, Wolfgang-Pauli-Strasse 16, 8093 Zürich, Switzerland
| | - Z. Chang
- Physics Department, Kansas State University, 116 Cardwell Hall, Manhattan, Kansas 66506, United States
| | - T. Jahnke
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
| | - R. Dörner
- Institut für Kernphysik, Goethe Universität, Max-von-Laue-Strasse 1, 60486 Frankfurt, Germany
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Karlický F, Lepetit B, Kalus R, Gadéa FX. Vibrational spectrum of Ar3(+) and relative importance of linear and perpendicular isomers in its photodissociation. J Chem Phys 2011; 134:084305. [PMID: 21361537 DOI: 10.1063/1.3555275] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photodissociation dynamics of the argon ionized trimer Ar(3)(+) is revisited in the light of recent experimental results of Lepère et al. [J. Chem. Phys. 134, 194301 (2009)], which show that the fragment with little kinetic energy is always a neutral one, thus the available energy is shared by a neutral and ionic fragments as in Ar(2)(+). We show that these results can be interpreted as the photodissociation of the linear isomer of the system. We perform a 3D quantum computation of the vibrational spectrum of the system and study the relative populations of the linear (trimer-core) and perpendicular (dimer-core) isomers. We then show that the charge initially located on the central atom in the ground electronic state of the linear isomer migrates toward the extreme ones in the photoexcitation process such that photodissociation of the linear isomer produces a neutral central atom at rest in agreement with measured product state distributions.
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Affiliation(s)
- Frantisek Karlický
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University, Olomouc, Czech Republic.
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Pérez de Tudela R, Márquez-Mijares M, González-Lezana T, Roncero O, Miret-Artés S, Delgado-Barrio G, Villarreal P. A path-integral Monte Carlo study of a small cluster: The Ar trimer. J Chem Phys 2010; 132:244303. [DOI: 10.1063/1.3445773] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Gagin A, Yarevsky E, Salci M, Elander N. Eigen energies and the statistical distributions of the rovibrational levels of the bosonic van der Waals argon trimer. J Phys Chem A 2009; 113:14979-86. [PMID: 19883054 DOI: 10.1021/jp905109c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The eigen energies and the statistical distributions of the rovibrational levels (J = 0-2) of the bosonic van der Waals argon trimer were calculated using a full angular momentum three-dimensional finite element method. The influence of interatomic potentials on the vibrational levels and statistical properties of the trimer was discussed.
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Affiliation(s)
- Anton Gagin
- Department of Computational Physics, St. Petersburg State University, 198504 St. Petersburg, Russia
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15
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Márquez-Mijares M, Pérez de Tudela R, González-Lezana T, Roncero O, Miret-Artés S, Delgado-Barrio G, Villarreal P, Baccarelli I, Gianturco FA, Rubayo-Soneira J. A theoretical investigation on the spectrum of the Ar trimer for high rotational excitations. J Chem Phys 2009; 130:154301. [DOI: 10.1063/1.3115100] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Velilla L, Lepetit B, Aguado A, Beswick JA, Paniagua M. The H(3) (+) rovibrational spectrum revisited with a global electronic potential energy surface. J Chem Phys 2009; 129:084307. [PMID: 19044823 DOI: 10.1063/1.2973629] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
In this paper, we have computed the rovibrational spectrum of the H(3) (+) molecule using a new global potential energy surface, invariant under all permutations of the nuclei, that includes the long range electrostatic interactions analytically. The energy levels are obtained by a variational calculation using hyperspherical coordinates. From the comparison with available experimental results for low lying levels, we conclude that our accuracy is of the order of 0.1 cm(-1) for states localized in the vicinity of equilateral triangular configurations of the nuclei, and changes to the order of 1 cm(-1) when the system is distorted away from equilateral configurations. Full rovibrational spectra up to the H(+)+H(2) dissociation energy limit have been computed. The statistical properties of this spectrum (nearest neighbor distribution and spectral rigidity) show the quantum signature of classical chaos and are consistent with random matrix theory. On the other hand, the correlation function, even when convoluted with a smoothing function, exhibits oscillations which are not described by random matrix theory. We discuss a possible similarity between these oscillations and the ones observed experimentally.
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Affiliation(s)
- Luis Velilla
- Departamento de Química Física, Facultad de Ciencias C-XIV, Universidad Autónoma de Madrid, 28049, Madrid, Spain
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Symmetry assignment in the distributed Gaussian functions method to study homonuclear rotating trimers. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.06.052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Karlický F, Lepetit B, Kalus R, Paidarová I, Gadéa FX. Modeling of HeN+ clusters. II. Calculation of He3+ vibrational spectrum. J Chem Phys 2008; 128:124303. [PMID: 18376915 DOI: 10.1063/1.2841019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have computed the vibrational spectrum of the helium ionized trimer He(3)(+) using three different potential energy surfaces [D. T. Chang and G. L. Gellene, J. Chem. Phys. 119, 4694 (2003); E. Scifoni et al., ibid. 125, 164304 (2006); I. Paidarova et al., Chem. Phys. 342, 64 (2007)]. Differences in the details of these potential energy surfaces induce discrepancies between bound state energies of the order of 0.01 eV. The effects of the geometric phase induced by the conical intersection between the ground electronic potential energy surface and the first excited one are studied by computing vibrational spectra with and without this phase. The six lowest vibrational bound states are negligibly affected by the geometric phase. Indeed, they correspond to wavefunctions localized in the vicinity of the linear symmetric configurations and can be assigned well defined vibrational quantum numbers. On the other hand, higher excited states are delocalized, cannot be assigned definite vibrational quantum numbers, and the geometric phase shifts their energies by approximately 0.005 eV.
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Affiliation(s)
- Frantisek Karlický
- Department of Physics, Faculty of Science, University of Ostrava, 30 dubna 22, 701 03 Ostrava, Czech Republic
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