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1.
Mikhail Ivanovich Barnik Ivan Vladimirovich Simdyankin Boris Alexandrovich Umanskii Serguei Petrovich Palto 《Liquid crystals》2020,47(2):273-283
ABSTRACT Electro-optical switching and the liquid crystal (LC) director distribution are studied in spatially periodic electric field for vertically aligned LC with negative dielectric anisotropy. Two electro-optical switching modes characterised by different switching times are observed. These modes are well distinguished optically by choosing proper geometry for the polarisers axes orientation. One of these modes is significantly faster as compared to the other. The fast switching is explained in terms of localised near-to-surface director reorientation. The 3D-numerical simulation shows very good agreement with the experiment: it points out the existence of the disclination lines and field-stabilised walls responsible for the localised director field switching and its relaxation. Possibilities of enhancing the fast mode for high-speed light modulators are discussed. 相似文献
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By means of Hartree—Fock energy variance calculations it has been shown that the specific electroncorrelation energy in extended cumulene molecules is approximately 0.3 eV/electron and the specific energy of interaction between -electron shells is 0.1 eV/electron.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 29, No. 6, pp. 514–517, November–December, 1993. 相似文献
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A. S. Moskalenko D. A. Rok S. Ya. Umanskii 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(1):8-15
For a model molecular system with one vibrational degree of freedom and three electronic states coupled by pump and probe
laser pulses in a condensed medium, the response signal in a femtosecond pump-probe experiment is calculated. The potential
curves of all three states are described by the Morse potential. Calculations are performed using two qualitatively different
approaches to describing the medium-induced relaxation: with memory of the relaxation process and without memory (Markovian
approximation). The temporal evolution of the vibrational wave packet in the intermediate electronically excited state is
described using a master equation for the density matrix of the molecular system, which is derived within the framework of
the Nakajima-Zwanzig formalism. It is demonstrated that, at short delay times, when the proposed approach is applicable, taking
into account memory effects can substantially change the form of the pump-probe experiment signal in comparison with the signal
calculated in the Markovian approximation. 相似文献
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A. I. Reznikov S. Ya. Umanskii Yu. F. Chaikina 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(2):173-178
The rate constant for the quenching of excited F(2 P 1/2) and Cl(2 P 1/2) atoms in collisions with N2 molecules were calculated. The electron interaction matrix between N2(X 1Σ g + ) and F and Cl atoms in the 2 P j state calculated asymptotically taking into account quadrupole-quadrupole, dispersion, and exchange interactions was used. The dynamic problem of electronic transitions was solved using the modified wave number approximation, the exactly solvable semiclassical exponential nonadiabatic bond model, and the method of phase functions. 相似文献
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A. I. Reznikov S. Ya. Umanskii Yu. F. Chaikina 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(1):18-23
The interaction matrix between the N2 molecule in the X 1Σ g + and A 3Σ u + states and the Zn atom in the 1 S and 3 P states calculated earlier by the asymptotic method was used to find the rate constants for the electron-vibrational energy exchange N2(A 3Σ u + , v) + Zn(1 S) → N2(X 1Σ 8 + , v′) + Zn(3 P). The calculations were performed by the transition state method, and the probabilities of transitions between intersecting electron-vibrational terms of the system in motion along the reaction coordinate were determined by the Landau-Zener equation. The calculated electron excitation transfer constants between N2(A 3Σ u + , v = 1, 0) and Zn(1 S) over the temperature range 300–900 K were on the order of 10?11?10?12 cm3/s. 相似文献