The Role of Molecular Vibrations in the Spin Crossover Phenomenon

2006 ◽  
pp. 84-103 ◽  
Author(s):  
Jean-Pierre Tuchagues ◽  
Azzedine Bousseksou ◽  
Gábor Molnár ◽  
John J. McGarvey ◽  
François Varret
Keyword(s):  
Spin Crossover ◽  
Molecular Vibrations

scholarly journals Ultrastrong coupling effects in molecular cavity QED

Nanophotonics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 277-281 ◽  
Author(s):  
Jorge Calvo ◽  
David Zueco ◽  
Luis Martin-Moreno
Keyword(s):  
Cavity Qed ◽  
Molecular Vibrations ◽  
Level System ◽  
Coupling Effects ◽  
Photon Interaction ◽  
Exciton Coupling ◽  
Energy Dynamics

AbstractThe spectrum and energy dynamics for a system that comprises a molecule interacting with a cavity photon is analyzed, taking into account the effect of both molecular vibrations and counter-rotating terms (CR) in the dipole Hamiltonian. The CR terms do not have a strong effect on the spectrum even for moderately large values of the exciton-photon interaction. However, it is shown that the polariton subspace is governed by an effective Quantum-Rabi Hamiltonian, where polaritons act as a two-level system and the phonons play the role of cavity photons. The effect of the CR terms is amplified in the dynamics: as the vibrations reduce the effective photon-exciton coupling, small Bloch-Siegert energy shifts can bring the system out of resonance.

The role of anharmonicity in the systems with spin crossover

2016 ◽  
Vol 42 (6) ◽  
pp. 505-512 ◽  
Author(s):  
V. V. Shelest ◽  
A. V. Khristov ◽  
G. G. Levchenko
Keyword(s):  
Spin Crossover

Positron binding to alkali-metal hydrides: The role of molecular vibrations

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
Franco A. Gianturco ◽  
Jan Franz ◽  
Robert J. Buenker ◽  
Heinz-Peter Liebermann ◽  
Lukáš Pichl ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Hydrides ◽  
Molecular Vibrations

scholarly journals Interplay of Jahn-Teller Ordering and Spin Crossover in Co(II) Compounds

2020 ◽  
Vol 6 (4) ◽  
pp. 62
Author(s):  
Sophia Klokishner ◽  
Serghei M. Ostrovsky
Keyword(s):  
Experimental Data ◽  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Theoretical Approach ◽  
Spin Crossover ◽  
Qualitative And Quantitative ◽  
Jahn Teller ◽  
Quantitative Explanation ◽  
Interionic Interactions

The spin crossover phenomena in Co(II) compounds are in the focus of the present paper. A microscopic theoretical approach for the description of spin transitions in mononuclear Co(II) compounds is suggested. Within the framework of this approach there are taken into account two types of interionic interactions that may be operative in the problem such as the electron-deformational interaction and the cooperative Jahn-Teller interaction arising from the coupling of the low-spin state of the Co(II) ion with the tetragonal vibrations of the nearest surrounding. The different role of these interactions in the spin transformation is demonstrated and discussed. On the basis of developed approach a qualitative and quantitative explanation of the experimental data on the temperature dependence of the magnetic susceptibility for the [Co(pyterpy)2](PF6)2, [Co(pyterpy)2](TCNQ)2⋅DMF⋅MeOH and [Co(pyterpy)2](TCNQ)2⋅MeCN⋅MeOH compounds is given.

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