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1.
Averyanov, E. M.
Character of the N-D-D-h(0,d) phase transition in diskotic liquid crystals / E. M. Averyanov> // JETP Letters. - 1996. -
Vol. 63
,
Is. 1
. - P. 33-37,
DOI
10.1134/1.566959. - Cited References: 20 . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
MOLECULES
CONSTANTS
SPLAY
BEND
Аннотация:
The first experimental data on the orientational ordering of a diskotic reentrant nematic N-D are presented. The data show that the phase transition N-D-D-h(0,D-d) is a strong first-order transition with a large jump Delta S similar or equal to 0.2 in the orientational order parameter S of the
molecules
. This indicates an anomalously strong coupling between the columnar and orientational ordering of the
molecules
and explains the absence of fluctuational divergence of the elastic moduli K-11 and K-22 in the nematic phase near this transition. (C) 1996 American Institute of Physics.
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Доп.точки доступа:
Aver'yanov, E. M.
}
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2.
Density-functional model cluster
studies of EPR g tensors of F-s(+) centers on the surface of MgO / C. . Di Valentin [et al.]> // J. Chem. Phys. - 2006. -
Vol. 124
,
Is. 4
. - Ст. 44708,
DOI
10.1063/1.2161190. - Cited References: 37 . - ISSN 0021-9606
РУБ
Physics, Atomic, Molecular & Chemical
Рубрики:
ELECTRONIC G-TENSORS
CORRELATION-ENERGY
MGO(001) SURFACE
OXYGEN VACANCIES
SPIN-ORBIT
G-VALUES
ATOMS
APPROXIMATION
COMPLEXES
MOLECULES
Кл.слова (ненормированные):
Density-functional model cluster
--
Single-crystalline thin films
--
Spin-orbit interaction
--
Anisotropy
--
Paramagnetic resonance
--
Single crystals
--
Tensors
--
Thin films
--
Magnesium compounds
Аннотация:
We report g tensors of surface color centers, so-called F-s(+) centers, of MgO calculated with two density-functional approaches using accurately embedded cluster models. In line with recent UHV measurements on single-crystalline MgO film, we determined only small g-tensor anisotropies and negative shifts Delta g equivalent to g-g(e) for all F-s(+) sites considered, namely, (001)-terrace, step, edge, and corner sites. The g values are very sensitive to the local structure of the defect: relaxation reverses the sign of Delta g. However, accounting for the spin-orbit interaction either self-consistently or perturbatively yields very similar results. In addition to the values of the tensor components, their direction with respect to the surface was determined. In contrast to edges, significant deviations from ideal C-2v symmetry were found for F-s(+) centers at steps. Recent data on single-crystalline thin films are reevaluated in the light of these results. (c) 2006 American Institute of Physics.
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Держатели документа:
ICREA, Barcelona 08010, Spain
Univ Barcelona & Parc Cientif Barcelona, Dept Quim Fis, Barcelona 08028, Spain
Univ Barcelona & Parc Cientif Barcelona, Ctr Especial Recerca Quim Teor, Barcelona 08028, Spain
Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin, Germany
Russian Acad Sci, Inst Chem & Chem Technol, Krasnoyarsk 660049, Russia
Univ Milan Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy
Tech Univ Munich, Dept Chem Theoret Chem, D-85747 Garching, Germany
ИХХТ СО РАН
Dipartimento di Scienza dei Materiali, Universit? degli Studi Milano-Bicocca, 20125 Milano, Italy
Institucio Catalana de Recerca i Estudis Avanats (ICREA), 08010 Barcelona, Spain
Departament de Quimica Fisisca, Centre Especial de Recerca en Quimica Teorica, Parc Cientific de Barcelona, 08028 Barcelona, Spain
Fritz-Haber Institut, Max-Planck Gesellschaft, Department of Chemical Physics, Faradayweg 4-6, D-14195 Berlin, Germany
Institute of Chemistry and Chemical Technology, Russian Academy of Sciences, 660049 Krasnoyarsk, Russian Federation
Department Chemie, Theoretische Chemie, Technische Universitat Munchen, 85747 Garching, Germany
Доп.точки доступа:
Di Valentin, C.; Neyman, K. M.; Risse, T.; Sterrer, M.; Fischbach, E.; Freund, H. J.; Nasluzov, V. A.; Pacchioni, G.; Rosch, N.
}
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3.
Electron-rotation coupling in
diatomics under strong-field excitation / Y. R. Liu, Y. Wu, J. G. Wang [et al.]> // Phys. Rev. A. - 2020. -
Vol. 102
,
Is. 3
. - Ст. 033114,
DOI
10.1103/PhysRevA.102.033114. - Cited References: 78. - S.B.Z. thanks H. D. Meyer for his helpful instructions of Wigner-DVR in MCTDH. Grants from the National Basic Research Program of China (2017YFA0403200), NSFC (No. 11604197, No. 11974230, and No. 11934004), the Science Challenge Program of China (TZ2018005 and TZ2016005) are acknowledged. V.K. acknowledges financial support from Swedish Research Council (VR) and the Ministry of Science and High Education of Russian Federation, Project No. FSRZ2020-0008. . - ISSN 2469-9926. - ISSN 2469-9934
РУБ
Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
REAL-TIME OBSERVATION
DYNAMICS
LASER
ULTRAFAST
MOLECULES
Аннотация:
he photoexcitation and photodissociation of diatomic
molecules
by intense pulse lasers has been the subject of extensive investigations over the past decades. However, the usually employed theoretical framework neglects the coupling between the molecular rotational angular momentum (R) and the angular momentum of the electrons projected onto the molecular axis Ω=Λ+Σ, which results in the known Λ-doubling phenomenon in high-resolution electronic spectra of diatomic
molecules
. While neglecting this coupling is an excellent approximation in the weak-field or perturbative regime owing to the large mass difference between the rotating atoms and the electrons, the approximation breaks down for intense laser pulses because of the repeated Rabi cycling of the electronic transitions, which can have a significant effect on the rotational degrees of freedom of the molecule. By correcting the transition dipole matrix elements and introducing angular basis sets based on Wigner D functions, the conventional theoretical treatment is generalized to a universal description valid for both the weak- and strong-field regimes. The theoretical treatment developed here is applied to the ∣1Σ› to ∣1Π› transitions in diatomic systems. Our results reveal that, for field intensities resulting in about one Rabi cycling for extreme ultraviolet or x-ray transitions, the theoretical predictions by the conventional theoretical frame need to be corrected when considering observables such as the molecular alignment and the angular distribution of the photofragments.
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Держатели документа:
Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710119, Peoples R China.
Inst Appl Phys & Computat Math, POB 8009, Beijing 100088, Peoples R China.
Peking Univ, Ctr Appl Phys & Technol, Beijing 100084, Peoples R China.
Heidelberg Univ, Phys Chem Inst, Theoret Chem, Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
Royal Inst Technol, Theoret Chem & Biol, S-10691 Stockholm, Sweden.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Liu, Yan Rong; Wu, Yong; Wang, Jian Guo; Vendrell, Oriol; Kimberg, V.; Кимберг, Виктор Валерьевич; Zhang, Song Bin
}
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4.
Gerasimova, J. V.
Evans hole in internal modes IR spectrum of WO3F33-ions in (NH4)(3)WO3F3 crystal / J. V. Gerasimova, A. N. Vtyurin> // Chem. Phys. Lett. - 2012. -
Vol. 523
. - P. 144-147,
DOI
10.1016/j.cplett.2011.12.041. - Cited References: 11. - We would like to thank Prof. E. M. Aver'yanov for discussion, and V. A. Ouskin for the technical assistance. This work has been supported by the Russian Foundation for Basic Researches, Grant No. 11-02-98002-r_sibir_a. . - ISSN 0009-2614
РУБ
Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
INFRARED-SPECTRA
PHASE-TRANSITIONS
OXYFLUORIDE
MOLECULES
Аннотация:
Infrared absorption of (NH4)(3)WO3F3 compound has been studied. Profile of asymmetric band in 600-1000 cm (1) range associated with polar W-O vibrations of WO3F33- ions is explicable on the basis of multi-oscillatory dynamics with account of damping. Complex profile with Evans holes proves that internal modes of WO3F33- anions in the fluorine-oxygen octahedron interact due to the effects of the local field. (C) 2011 Elsevier B. V. All rights reserved.
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Держатели документа:
[Gerasimova, Ju V.
Vtyurin, A. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Герасимова, Юлия Валентиновна
}
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5.
Aver'yanov, E. M.
New features of a smectic-A-crystal-B phase transition in a homologous series of liquid crystals / E. M. Aver'yanov> // JETP Letters. - 2014. -
Vol. 99
,
Is. 3
. - P. 158-163,
DOI
10.1134/S0021364014030047. - Cited References: 21 . - ISSN 0021-3640. - ISSN 1090-6487
РУБ
Physics, Multidisciplinary
Рубрики:
POLARIZABILITY
POLYMORPHISM
ANISOTROPY
MOLECULES
BEHAVIOR
Аннотация:
The components L j of the Lorentz tensor and the polarizability density of
molecules
G in the smectic-A and crystalline-B phases have been determined for homologues of the series of alkyl-p-(4-alkoxybenzylideneamino-)cinnamates. The quantity L j (G) in both phases is a linear (quadratic) function of the orientational order parameter of
molecules
S, which is invariant (noninvariant) with respect to the A-B transition, which is manifested in the form of jumps δL j and δG and enhancement of the G(S) dependence. An increase in the length of terminal molecular chains and weakening of interlayer correlation of
molecules
are accompanied by strengthening of the A-B transition of the first order and G(S) dependences in both phases together with an increase in δL j and δG. Change δG and dependence G(S) in the B phase are related to change in the conformation (flattening) of aromatic molecular cores.
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Публикация на русском языке
Аверьянов, Евгений Михайлович. Новые особенности фазового перехода смектик-A-кристалл-B в гомологическом ряду жидких кристаллов [Текст] / Е. М. Аверьянов // Письма в Журн. эксперим. и теор. физ. : Наука, 2014. - Т. 99 Вып. 3-4. - С. 179-184
Доп.точки доступа:
Аверьянов, Евгений Михайлович
}
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6.
Averyanov, E. M.
Orientation ordering and critical behavior of discoid nematics / E. M. Averyanov> // Zhurnal Eksperimentalnoi Teor. Fiz. - 1996. -
Vol. 110
,
Is. 5
. - P. 1820-1840. - Cited References: 55 . - ISSN 0044-4510
РУБ
Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTALS
PHASE-TRANSITION
ISOTROPIC-PHASE
LOCAL FIELD
SMECTIC-A
MOLECULES
SUSCEPTIBILITY
CONFORMATION
PARAMETER
DYNAMICS
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7.
Averyanov, E. M.
Orientational order and critical-behavior of a discoid nematic liquid-crystal / . M. AVERYANOV> // JETP Letters. - 1995. -
Vol. 61
,
Is. 10
. - P. 815-820. - Cited References: 14 . - ISSN 0021-3640
РУБ
Physics, Multidisciplinary
Рубрики:
MOLECULES
Аннотация:
First experimental data on the orientational order of the
molecules
in a discoid nematic liquid crystal are reported. These results are dramatically at odds with the results of a numerical simulation for rigid disk-shaped
molecules
. The N-D-I phase transition is simultaneously close to an isolated Landau critical point and to the tricritical point, as in ordinary calamite nematic liquid crystals with Planckian
molecules
. This result indicates that conformational degrees of freedom of the molecule play an important role in the features of the N-D-I transition. (C) 1995 American Institute of Physics.
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Доп.точки доступа:
Аверьянов, Евгений МихайловичAver'yanov
}
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8.
Aver'yanov, E. M.
Structural and thermodynamic consequencies of the interaction of conformational degrees of freedom of azomethines in the nematic phase / E. M. Aver'yanov> // J. Struct. Chem. - 2014. -
Vol. 55
,
Is. 4
. - P. 605-611,
DOI
10.1134/S0022476614040039. - Cited References: 21 . - ISSN 0022-4766. - ISSN 1573-8779
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
CONJUGATED POLY(AZOMETHINE)S
TERMINAL SUBSTITUENTS
ELECTRONIC-STRUCTURES
FLUORINATED ANALOGS
INTERNAL-ROTATION
MOLECULES
COMPOUND
ANGLES
STATE
NMR
Кл.слова (ненормированные):
azomethines
--
benzylideneaniline
--
conformation
--
steric effects of substituents
--
nematic-isotropic liquid transition
--
conformational polymorphism
Аннотация:
The interaction of the conformational degrees of freedom of azomethines in the nematic phase, which is induced by electronic donor-acceptor properties of the terminal substituents of the benzylideneaniline core is studied. These degrees of freedom related to the rotation angles phi (k) around the bonds between the substituent and the aniline ring (phi(1)) and also between the CH=N bridge and the aniline ring (omega(2)) are characterized by the parameters Q (k) = aOE (c) cos(2)phi (k) >. It is found that the interaction of these degrees of freedom is manifested in the linear dependence Q (2)(Q (1)). Within the phenomenological theory the effect of this interaction on changes delta (k) in the Q (k) values during the nematic liquid crystal-isotropic liquid phase transition is revealed along with the temperature T (NI) and character of this transition. The derivation of previously established empirical dependences T (NI)(Q (k) ) is presented in the presence of direct and indirect steric effects of side substituents affecting the Q (k) values. A diverse combination of delta (k) signs in the nematic phase, which is a prerequisite for the conformational polymorphism of the nematic phases of azomethines, is shown.
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Публикация на русском языке
Аверьянов, Евгений Михайлович. Структурные и термодинамические следствия взаимодействия конформационных степеней свободы азометинов [Текст] / Е. М. Аверьянов // Журн. структ. химии. - Новосибирск : Изд-во СО РАН, 2014. - Т. 55 № 4. - С. 641 - 647
Доп.точки доступа:
Аверьянов, Евгений Михайлович
}
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9.
Аверьянов, Евгений Михайлович
.
Температурные зависимости показателей преломления одноосных каламитных жидких кристаллов с высоким двупреломлением / Е. М. Аверьянов> // Жидк. кристаллы и их практич. использ. - 2018. -
Т. 18
,
№ 2
. - С. 53-63 ; Liq. Cryst. Appl.,
DOI
10.18083/LCAppl.2018.2.53. - Библиогр.: 29 . - ISSN 1991-3966
Перевод заглавия:
Temperature dependences of the refractive indices of uniaxial calamitic liquid crystals with high birefringence
РУБ
Crystallography
Рубрики:
PHASE-TRANSITION
ORIENTATIONAL ORDER
ISOTROPIC LIQUID
MOLECULES
Кл.слова (ненормированные):
жидкие кристаллы
--
температурные зависимости показателей преломления
--
liquid crystals
--
temperature dependences of the refractive indices
Аннотация:
Температурные зависимости показателей преломления nj(t) и величин
= (n|| + 2n⊥)/3, n(t) =ε-1/2, ε= (ε|| + 2ε⊥)/3, εj = nj2 для световых волн с поляризацией вдоль (j = ||) и нормально директору (j = ⊥) в одноосных каламитных жидких кристаллах (ЖК) исследованы в рамках микроскопического подхода с учетом анизотропии тензора локального поля fj(t) =1 + Lj(t)[εj(t)–1] и тензора Лорентца Lj(t). Показано, что известные отрицательные производные
' = d
/dt, n' и точка to минимума на зависимости n⊥(t) в каламитных ЖК отвечают малым и средним значениям двупреломления Δn = n|| – n⊥. Для ЖК с высокими величинами Δn и компонентами L⊥, превышающими пороговое значение L⊥e(nj), предсказаны два новых эффекта: положительные значения
', и наличие точки te максимума на зависимости n||(t). Для ряда нематиков с высокими значениями Δn определены компоненты Lj(t), подтверждено наличие предсказанных эффектов и условий их проявления, получены значения te и прослежена их связь с величиной Δn. Выяснены особенности перехода от ЖК с точкой to к ЖК с точкой te по мере роста Δn.
The temperature dependences of the refractive indices nj(t) and the values
= (n|| + 2n⊥)/3, n(t) =ε-1/2, ε= (ε|| + 2ε⊥)/3, εj = nj2 for the light waves polarized along (j = ||) and across (j = ⊥) the director in uniaxial calamitic liquid crystals (LCs) were studied within the microscopic approach with taking into account the anisotropy of the local-field tensor fj(t) =1 + Lj(t)[εj(t)–1] and the Lorentz tensor Lj(t). The known negative derivatives
' = d
/dt, n' and the point to of minimum at the dependence n⊥(t) for calamite LCs were shown to correspond to small and medium values of the birefringence Δn = n|| – n⊥. For LCs with high values of δn and components L⊥ exceeding the threshold value L⊥e two new effects were predicted: positive derivatives
', and the presence of the point te of maximum at the dependence n||(t). For a number of nematics with high values of Δn the components Lj(t) were determined, the presence of the predicted effects and the conditions for their manifestation were confirmed, the values te were obtained and their connection with the magnitude Δn were established. The features of the transition from LCs with point to to LCs with point c under gradual increase in Δn were cleared up.
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Держатели документа:
RAS, Fed Res Ctr, Kirensky Inst Phys, KSC,SB, 50 Akademgorodok, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Aver'yanov, E. M.
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