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Articles de revues sur le sujet « Polarizability tensor »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 1 février 2022

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1

Ledger, Paul D., et W. R. Bill Lionheart. « Understanding the magnetic polarizability tensor ». IEEE Transactions on Magnetics 52, no 5 (mai 2016) : 1–16. http://dx.doi.org/10.1109/tmag.2015.2507169.

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2

Brot, Claude. « Liquides de toupies symétriques : leur tenseur de polarisabilité optique intrinsèque via deux expériences sous champ statique : CH3CN ». Canadian Journal of Chemistry 68, no 9 (1 septembre 1990) : 1490–93. http://dx.doi.org/10.1139/v90-228.

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NMR line splitting under a strong static electric field (EF-NMR) allows one to measure the average alignment (second spherical harmonic) of the molecule studied under the influence of the field. This average alignment (per unit squared field) can be formulated theoretically by an expression involving the permanent dipole moment, the anisotropy of the static polarizability, etc. and possibly orientational intercorrelations within the liquid. On the other hand the Kerr constant per molecule can be represented by the same expression, multiplified by a factor that is independent of any static electrical property of the molecule (for a gas this factor would be simply proportional to the anisotropy of the optical polarizability). Consequently the ratio of the above experimental results contains information bearing only on the optical properties. The formalism of the "tensor of polarizability increment" developed by the author for liquids made up of ellipsoidal molecules is employed. It is shown that by combining the above ratio with the constitutive equation for the refractivity of the liquid, the two distinct principal elements of the tensor of polarizability increment of the symmetric top molecules constituting the liquid are immediately obtained. Using then the molecular volume, a van der Waals estimate for the elongation of the molecule, and the index of refraction of the liquid, one can calculate the elements of the optical polarizability tensor invacuo. The method is illustrated by neat acetonitrile for which the necessary experimental data exist in the literature. One finds, in units 1040 C2 m2 J−1 5.06 for the mean polarizability and 2.52 for its anisotropy. A published experimental study using depolarized light scattering in the gas phase indicates that the corresponding figures are 4.96 and 2.49 respectively at λ = 633 nm. Finally and accessorily, it is suggested that dipolar intercorrelations are weak in acetonitrile. Indeed, using an analogous formalism for the static permittivity of the liquid, a value for the permanent moment of the molecule is deduced. This value is within 1% of the experimental gas value. Keywords: polarizability tensors, liquids, Kerr constant, NMR.
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3

Schaumburg, G., et H. W. Helberg. « Optical polarizability tensor and absorption tensor in (fluoranthen)2PF6 ». Synthetic Metals 42, no 3 (mai 1991) : 2403–6. http://dx.doi.org/10.1016/0379-6779(91)91392-n.

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Kolafa, Jiří. « A Polarizable Three-Site Water Model with Intramolecular Polarizability ». Collection of Czechoslovak Chemical Communications 73, no 4 (2008) : 507–17. http://dx.doi.org/10.1135/cccc20080507.

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The forgotten "atom dipole interaction model" in which several induced dipoles in a molecule can interact is investigated. This model leads to an anisotropic (tensor) polarizability of a molecule using only isotropic (scalar) atomic contributions. A three-site model of water reproducing the experimental tensor polarizability is developed and tested using molecular dynamics calculations.
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5

Laidig, Keith E. « Atomic origins of molecular polarizabilities ». Canadian Journal of Chemistry 74, no 6 (1 juin 1996) : 1131–38. http://dx.doi.org/10.1139/v96-127.

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We demonstrate that the multipole polarizability tensors of a molecule are expressible as a sum of atomic contributions, each of which is based upon the change in the spatial distribution of electronic charge within each atom resulting from the application of electric fields and field gradients. The use of the spatially defined atoms of subsystem quantum mechanics correctly partitions molecular polarizabilities into physically meaningful atomic contributions. It is shown that the origin of any molecular polarizability tensor may be understood from an investigation of these contributions and the general expressions for the summation of atomic components to yield molecular polarizabilities are presented. Their use is demonstrated by the construction and investigation of the axial components of the dipole–dipole dipole–quadrupole, and quadrupole–quadrupole polarizability tensors of carbon monoxide and carbon sulfide. Key words: atomic polarizabilities, atoms-in-molecules, molecular polarizabilities.
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6

Miller, Kenneth J. « Calculation of the molecular polarizability tensor ». Journal of the American Chemical Society 112, no 23 (novembre 1990) : 8543–51. http://dx.doi.org/10.1021/ja00179a045.

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7

Коротун, А. В., et Н. И. Павлище. « Анизотропия оптических свойств металлических нанодисков ». Оптика и спектроскопия 129, no 11 (2021) : 1435. http://dx.doi.org/10.21883/os.2021.11.51646.2593-21.

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Expressions for the diagonal components of the polarizability tensor, absorption cross sections, and dimensional dependences of the surface plasmon resonance frequencies of metal nanodisks are obtained in the work in the classical approximation. Calculations of the frequency and size dependences of these characteristics for disks of different metals and with different aspect ratios are presented. The influence of the aspect ratio on the evolution of the frequency dependences of the components of the polarizability tensor and absorption cross sections is analyzed. The most significant factors influencing the splitting of the surface plasmon resonance in metal nanodisks with a small asect ratio have been determined.
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8

Raj, Ankit, Hiro-o. Hamaguchi et Henryk A. Witek. « Polarizability tensor invariants of H2, HD, and D2 ». Journal of Chemical Physics 148, no 10 (14 mars 2018) : 104308. http://dx.doi.org/10.1063/1.5011433.

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9

Davidson, John L., Omar A. Abdel-Rehim, Peipei Hu, Liam A. Marsh, Michael D. O’Toole et Anthony J. Peyton. « On the magnetic polarizability tensor of US coinage ». Measurement Science and Technology 29, no 3 (14 février 2018) : 035501. http://dx.doi.org/10.1088/1361-6501/aa9cf2.

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10

Tammer, R., et W. Hüttner. « Kerr effect and polarizability tensor of gaseous ethene ». Molecular Physics 83, no 3 (20 octobre 1994) : 579–90. http://dx.doi.org/10.1080/00268979400101441.

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11

Wong, Min-Liang. « Polarizability and tensor ellipsoid in the Raman effect ». Vibrational Spectroscopy 7, no 2 (juillet 1994) : 197–99. http://dx.doi.org/10.1016/0924-2031(94)85031-3.

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12

Adeniyi, Adebayo A., et Peter A. Ajibade. « The Spectroscopic and Conductive Properties of Ru(II) Complexes with Potential Anticancer Properties ». Journal of Spectroscopy 2014 (2014) : 1–14. http://dx.doi.org/10.1155/2014/656830.

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Different density functional methods (DFT) have been used to optimize and study the chemistry of five potential anticancer complexes in terms of their electronic, conductive, and spectroscopic properties. Many of the computed properties in addition to the IR and QTAIM analysis of the NMR are dipole moment vector (μi), linear polarizability tensor (αij), first hyperpolarizability tensors (βijk), polarizability exaltation index (Γ), and chemical hardness (η) of the complexes. Stable low energy geometries are obtained using basis set with effective core potential (ECP) approximation but, in the computation of atomic or molecular properties, the metal Ru atom is better treated with higher all electron basis set like DGDZVP. The spectroscopic features like the IR of the metal-ligand bonds and the isotropic NMR shielding tensor of the coordinated atoms are significantly influenced by the chemical environment of the participating atoms. The carboxylic and pyrazole units are found to significantly enhance the polarizabilities and hyperpolarizabilities of the complexes while the chloride only improves the polarity of the complexes. Fermi contacts (FC) have the highest effect followed by the PSO among all the four Ramsey terms which defined the total spin-spin coupling constant J (HZ) of these complexes.
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13

Buchachenko, Alexei A. « Anisotropy of the static dipole polarizability induced by the spin–orbit interaction : the S-state atoms N–Bi, Cr, Mo and Re ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 467, no 2129 (17 novembre 2010) : 1310–28. http://dx.doi.org/10.1098/rspa.2010.0440.

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A systematic ab initio study is performed on the ground state static dipole polarizabilities of the 2 S +1 S, S >1/2, atoms from N to Bi, Cr, Mo, Mn, Tc and Re. The benchmark scalar-relativistic values of the scalar polarizability components are obtained using the coupled cluster method. The spin–orbit configuration interaction calculations are carried out for the anisotropic (tensor) polarizability components of these atoms (except Mn and Tc) that arise from the second-order spin–orbit interaction. The tensor polarizabilities are calculated for the first time and found to increase from 10 −5 (N) to 3.8 atomic units (Bi) approximately as the fourth power of the nuclear charge. The simple correlations and implication to magnetic trapping of cold atoms are discussed.
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14

Lee, Kwang-Geol, Hyun-Woo Kihm et Dai-Sik Kim. « Polarizability Tensor Measurements of Gold Nanoparticle Functionalized Tips : Ellipsometry ». Journal of the Korean Physical Society 55, no 6 (15 décembre 2009) : 2392–95. http://dx.doi.org/10.3938/jkps.55.2392.

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15

Yazdi, Mohammad, et Nader Komjani. « POLARIZABILITY TENSOR CALCULATION USING INDUCED CHARGE AND CURRENT DISTRIBUTIONS ». Progress In Electromagnetics Research M 45 (2016) : 123–30. http://dx.doi.org/10.2528/pierm15092502.

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16

Liu, Xing-Xiang, Yang Zhao et Andrea Alu. « Polarizability Tensor Retrieval for Subwavelength Particles of Arbitrary Shape ». IEEE Transactions on Antennas and Propagation 64, no 6 (juin 2016) : 2301–10. http://dx.doi.org/10.1109/tap.2016.2546958.

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17

Bernal Arango, Felipe, et A. Femius Koenderink. « Polarizability tensor retrieval for magnetic and plasmonic antenna design ». New Journal of Physics 15, no 7 (9 juillet 2013) : 073023. http://dx.doi.org/10.1088/1367-2630/15/7/073023.

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18

Paidarová, Ivana, Roman Čurík et Stephan P. A. Sauer. « Calculations of Polarizabilities and Their Gradients for Electron Energy-Loss Spectroscopy ». Collection of Czechoslovak Chemical Communications 73, no 11 (2008) : 1509–24. http://dx.doi.org/10.1135/cccc20081509.

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We illustrate for a set of small hydrocarbons, CH4, C2H4, C3H6 and C3H8, the important role of the electric dipole polarizability tensor and its geometric derivatives in theoretical models of electron energy-loss spectra (EELS). The coupled cluster linear response method together with Sadlej's polarized valence triple zeta basis set of atomic orbitals were used to calculate the polarizabilities and polarizability gradients. Incorporation of these ab initio data into the discrete momentum representation method (DMR) leads to perfect agreement between theory and collision experiments.
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19

Yamamoto, Shigeki, et Petr Bouř. « On the limited precision of transfer of molecular optical activity tensors ». Collection of Czechoslovak Chemical Communications 76, no 5 (2011) : 567–83. http://dx.doi.org/10.1135/cccc2011018.

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Transfer of molecular property tensors (force field, dipole derivatives, polarizabilities, etc.) from smaller fragments to bigger molecules is powerful tool to calculate molecular vibrational spectra. However, we found serious accuracy limits for valinomycin (Phys. Chem. Chem. Phys. 2010, 12, 11021), where the transfer of the Raman optical activity tensors (ROA) had to be avoided. Therefore, in this study, the individual polarizable group model is analyzed for a model water dimer, and the corrections stemming from mutual group polarizations neglected in the transfer are estimated ab initio. The electric dipole polarizability was found more local and less sensitive to the interaction of distant molecular parts than the optical activity tensors (G′, A), which can partially explain the error observed during the transfer. In the second part of the study, tensor derivatives are transferred from smaller fragments to model valinomycin and insulin molecules, and the resultant tensor derivatives and ROA spectra compared to benchmark computations. The results confirmed that the error is caused by mutual polarization of molecular parts, more significant in insulin than in valinomycin, and could only partially be improved by increased size of the fragments.
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20

Makkonen, J., L. A. Marsh, J. Vihonen, A. Järvi, D. W. Armitage, A. Visa et A. J. Peyton. « KNN classification of metallic targets using the magnetic polarizability tensor ». Measurement Science and Technology 25, no 5 (27 mars 2014) : 055105. http://dx.doi.org/10.1088/0957-0233/25/5/055105.

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21

KOH, I. S. « Low Frequency Scattering by Circular Dielectric Cylinder : New Polarizability Tensor ». IEICE Transactions on Electronics E88-C, no 11 (1 novembre 2005) : 2163–65. http://dx.doi.org/10.1093/ietele/e88-c.11.2163.

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22

GIRIBET, By CLAUDIA G., MA DOLORES DEMARCO, MARTIN C. RUIZ DE AZUA et RUBEN H. CONTRERAS. « Ab initio ‘CLOPPA’ decomposition of the static molecular polarizability tensor ». Molecular Physics 91, no 1 (mai 1997) : 105–12. http://dx.doi.org/10.1080/002689797171797.

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23

Al'betkov, S. V., Yu A. Pivovarov, S. A. Podosenov, V. I. Sachkov et A. A. Sokolov. « A method of determining the polarizability tensor for a body ». Measurement Techniques 32, no 12 (décembre 1989) : 1172–76. http://dx.doi.org/10.1007/bf02110865.

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24

Kumar, Narinder, Bhavna Pal, Shivani Chaudhary, Devendra Singh et Devesh Kumar. « Reduced graphene oxide contains a minimum of six oxygen atoms for higher dipolar strength : A DFT study ». French-Ukrainian Journal of Chemistry 8, no 1 (2020) : 167–73. http://dx.doi.org/10.17721/fujcv8i1p167-173.

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The present work focused on the reduced graphene oxide contains a minimum of six oxygen atoms for the higher dipolar strength. The ionization potential and electron affinity decreased only for the six oxygen atoms based graphene. The six oxygen atoms based graphene have the highest dipole moment. The reduced graphene has 0.25 eV bandgap, which is very suitable for electron transfer. The six oxygen atoms based graphene leads to the least gauge including atomic orbital (GIAO) rotational tensor; however, it has the highest isotropic polarizability difference, diamagnetic susceptibility tensor difference, paramagnetic susceptibility tensor difference, and total susceptibility. The C-C bond length has increased only for the six oxygen atoms based graphene.
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25

Schwerdtfeger, Peter, Ralf Wesendrup, Gloria E. Moyano, Andrzej J. Sadlej, Jörn Greif et Friedrich Hensel. « The potential energy curve and dipole polarizability tensor of mercury dimer ». Journal of Chemical Physics 115, no 16 (22 octobre 2001) : 7401–12. http://dx.doi.org/10.1063/1.1402163.

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26

Bondarev, I. V., S. A. Kuten et I. E. Lantsov. « Dynamical tensor polarizability in the ground state of the hydrogen atom ». Journal of Physics B : Atomic, Molecular and Optical Physics 25, no 22 (28 novembre 1992) : 4981–89. http://dx.doi.org/10.1088/0953-4075/25/22/029.

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27

Ledger, Paul D., et William R. B. Lionheart. « An Explicit Formula for the Magnetic Polarizability Tensor for Object Characterization ». IEEE Transactions on Geoscience and Remote Sensing 56, no 6 (juin 2018) : 3520–33. http://dx.doi.org/10.1109/tgrs.2018.2801359.

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Bouachir, M., M. Perrot, J. Lascombe, J. L. Bribes et R. Gaufrés. « Improved polarizability tensor derivative for the ν2 mode of hydrogen sulphide ». Journal of Raman Spectroscopy 20, no 11 (novembre 1989) : 735–38. http://dx.doi.org/10.1002/jrs.1250201106.

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Abdel-Rehim, Omar A., John L. Davidson, Liam A. Marsh, Michael D. O'Toole et Anthony J. Peyton. « Magnetic Polarizability Tensor Spectroscopy for Low Metal Anti-Personnel Mine Surrogates ». IEEE Sensors Journal 16, no 10 (mai 2016) : 3775–83. http://dx.doi.org/10.1109/jsen.2016.2535346.

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30

Ozdeger, Toykan, John L. Davidson, Wouter van Verre, Liam A. Marsh, William R. B. Lionheart et Anthony J. Peyton. « Measuring the Magnetic Polarizability Tensor Using an Axial Multi-Coil Geometry ». IEEE Sensors Journal 21, no 17 (1 septembre 2021) : 19322–33. http://dx.doi.org/10.1109/jsen.2021.3088809.

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31

Silenko, A. Ya. « Measurement of the tensor electric polarizability of a deuteron in storage rings ». Bulletin of the Russian Academy of Sciences : Physics 71, no 9 (septembre 2007) : 1339–43. http://dx.doi.org/10.3103/s1062873807090316.

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32

Silenko, A. J. « Manifestation of tensor magnetic polarizability of the deuteron in storage ring experiments ». European Physical Journal Special Topics 162, no 1 (août 2008) : 59–62. http://dx.doi.org/10.1140/epjst/e2008-00776-9.

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33

Ledger, P. D., et W. R. B. Lionheart. « The spectral properties of the magnetic polarizability tensor for metallic object characterisation ». Mathematical Methods in the Applied Sciences 43, no 1 (19 août 2019) : 78–113. http://dx.doi.org/10.1002/mma.5830.

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34

Lai, Shen, Huiying Liu, Zhaowei Zhang, Jianzhou Zhao, Xiaolong Feng, Naizhou Wang, Chaolong Tang et al. « Third-order nonlinear Hall effect induced by the Berry-connection polarizability tensor ». Nature Nanotechnology 16, no 8 (24 juin 2021) : 869–73. http://dx.doi.org/10.1038/s41565-021-00917-0.

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35

Bondarev, I. V., et S. A. Kuten. « Positronium Quadrupole Interactions in Crystals ». Zeitschrift für Naturforschung A 49, no 1-2 (1 février 1994) : 439–44. http://dx.doi.org/10.1515/zna-1994-1-266.

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Abstract It is shown that, due to the hyperfine interaction between the electron and the positron, positronium atoms in a crystal can acquire an effective quadrupole moment and a tensor polarizability. In such a case the effective quadrupolar interaction with intracrystalline fields leads to a quadrupolar splitting of the triplet level of positronium and also to an anisotropy of its magnetic quenching in the presence of an external magnetic field. The possibilities of observating this anisotropy experimentally are discussed.
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36

Dumon, B., J. Berrue, A. Chave et A. Barreau. « Diffusion dépolarisée Rayleigh par des molécules anisotropes : calcul analytique des contributions propres, collisionnelles et croisées pour divers potentiels ». Canadian Journal of Physics 67, no 5 (1 mai 1989) : 525–31. http://dx.doi.org/10.1139/p89-096.

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In a preceding paper, a new analytical calculation of the integrated Rayleigh light scattered intensities, taking into account the permanent anisotropy in the collisionnal polarizability tensor, has been developped. The contributions of orientational pair correlation collision induced light scattering and the cross term have been evaluated in the first order dipole induced dipole approximation, at low density in the center–center polarizability scheme. In this article, from these analytical expansions, we calculate contribution values in N2, CO2, Cl2, and O2 to the scattered intensities. The intermolecular potential is represented by a two (or three)-site Lennard–Jones model without (or with) a quadrupolar moment. We show that these new analytical calculations lead to important corrections of up to 30% for the cross term in O2, and that the potential choice plays an essential role. These results are compared with experimental data and to other studies.
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37

Helberg, Hans W. « Dispersion of the Polarizability Tensor by Inter- and Intrastack Excitations in Organic Conductors ». Molecular Crystals and Liquid Crystals 119, no 1 (mars 1985) : 179–82. http://dx.doi.org/10.1080/00268948508075155.

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38

Dekdouk, B., C. Ktistis, L. A. Marsh, D. W. Armitage et A. J. Peyton. « Towards metal detection and identification for humanitarian demining using magnetic polarizability tensor spectroscopy ». Measurement Science and Technology 26, no 11 (29 septembre 2015) : 115501. http://dx.doi.org/10.1088/0957-0233/26/11/115501.

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39

Deng, Yan, Li Zhang et Min Zhang. « Determining second-harmonic generation of nonlinear sandwich metasurface by nonlinear polarizability tensor method ». Journal of Physics B : Atomic, Molecular and Optical Physics 53, no 18 (24 juillet 2020) : 185403. http://dx.doi.org/10.1088/1361-6455/aba10d.

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40

Albaladejo, S., R. Gómez-Medina, L. S. Froufe-Pérez, H. Marinchio, R. Carminati, J. F. Torrado, G. Armelles, A. García-Martín et J. J. Sáenz. « Radiative corrections to the polarizability tensor of an electrically small anisotropic dielectric particle ». Optics Express 18, no 4 (3 février 2010) : 3556. http://dx.doi.org/10.1364/oe.18.003556.

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41

Sun, Zhen-Dong, Yun-Bo Duan et Jun Xu. « Vibration-torsion-rotation polarizability tensor operator for a molecule with an internal rotor ». Journal of Chemical Physics 108, no 3 (15 janvier 1998) : 918–26. http://dx.doi.org/10.1063/1.475455.

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42

Wang, Jianhai, et Ying Li. « Effect of the waveguide walls on magnetic polarizability tensor of the end opening ». Journal of Shanghai University (English Edition) 1, no 3 (décembre 1997) : 229–31. http://dx.doi.org/10.1007/s11741-997-0028-y.

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43

Legowski, S., A. Molhem, G. Osiński et P. Rudecki. « Tensor polarizability of cadmium atoms in the excited state (5s5p)3 P 1 ». Zeitschrift für Physik D Atoms, Molecules and Clusters 35, no 2 (juin 1995) : 101–5. http://dx.doi.org/10.1007/bf01437694.

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44

Summa, Francesco Ferdinando, et Paolo Lazzeretti. « Electronic Currents and Anapolar Response Induced in Molecules by Monochromatic Light ». Chemistry 3, no 3 (5 septembre 2021) : 1022–36. http://dx.doi.org/10.3390/chemistry3030073.

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It is shown that the electric dipole- and electric quadrupole–anapole polarizabilities, denoted respectively by fαβ′ and gα,βγ′, and the anapole magnetizability aαβ, are intrinsic properties of the electron cloud of molecules responding to optical fields. fαβ′ is a nonvanishing property of chiral and achiral compounds, whereas aαβ is suitable for enantiomer discrimination of chiral species. They can conveniently be evaluated by numerical integration, employing a formulation complementary to that provided by perturbation theory and relying on the preliminary computation of electronic current density tensors all over the molecular domain. The origin dependence of the dynamic anapolar response is rationalized via related computational techniques employing numerical integration, as well as definitions of molecular property tensors, for example, electric dipole and electric quadrupole polarizabilties and magnetizability. A preliminary application of the theory is reported for the Ra enantiomer of the hydrogen peroxide molecule, evaluating tensor components of electric dipole-anapole polarizability and anapole magnetizability as functions of the dihedral angle ϕ≡∠ H-O-O-H in the range 0∘≤ϕ≤180∘.
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45

KOTANJYAN, A. S., A. A. SAHARIAN et V. M. BARDEGHYAN. « CASIMIR-POLDER POTENTIAL IN THE GEOMETRY OF COSMIC STRING WITH CYLINDRICAL SHELL ». International Journal of Modern Physics : Conference Series 14 (janvier 2012) : 416–24. http://dx.doi.org/10.1142/s2010194512007532.

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Combined effects on the Casimir-Polder potential due to a cosmic string and coaxial metallic cylindrical shell are investigated. For the both regions inside and outside the shell, the potential is decomposed into pure string and shell-induced parts. In a special case of an isotropic polarizability tensor, the Casimir-Polder force in the interior region is attractive with respect to the shell. In the exterior region the force is attractive near the shell and repulsive at large distances from the shell.
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46

HORING, N. J. M., S. Y. LIU, V. V. POPOV et H. L. CUI. « TUNABLE GRID GATED DOUBLE-QUANTUM-WELL FET TERAHERTZ DETECTOR ». International Journal of High Speed Electronics and Systems 18, no 01 (mars 2008) : 147–57. http://dx.doi.org/10.1142/s0129156408005229.

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Several aspects of the theory of plasmon resonant DC photoconduction are discussed here, in connection with recent observations involving a THz-irradiated grid-gated double-quantum-well FET.1 In this, we construct a classical model of nonlinear polarizability to second order in the THz field using a “hydrodynamic” type formulation including the roles of a stress-tensor and friction/viscosity. The resulting second order polarizability exhibits resonant behavior when the THz frequency matches plasmon frequencies of the system, sharply reducing the effectiveness of screened impurity scattering potentials which can admit resonant DC photoconduction. Furthermore, we also show that an asymmetric double-quantum-well system with lateral periodicity can mix optical and acoustic plasmons, giving rise to an interlayer THz field which becomes very strong when tuned by gate voltage into the “mode-mode-repulsion” regime wherein the optical and acoustic modes equally share amplitude. This can enhance interlayer electron tunneling and may contribute to photoconductivity.
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47

Meyer, V., et D. H. Sutter. « A Broadband Microwave Fourier Transform Spectrometer, Especially Designed for Stark Effect Investigations of Almost Nonpolar Molecules ; the Electric Dipole Moment and the Anisotropy in the Static Electric Polarizability Tensor of 1,1-Dideuteroallene, D2C = C = CH2 ». Zeitschrift für Naturforschung A 48, no 5-6 (1 juin 1993) : 725–32. http://dx.doi.org/10.1515/zna-1993-5-626.

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Abstract A bridge type microwave Fourier transform spectrometer, equipped with flat oversized Stark cells and an operational range from 8 GHz to 40 GHz is described. As application we report the experimental determination of the vibronic ground state dipole moment and of the anisotropy in the static polarizability of 1,1-dideuteroallene. Our experimental values are: μa = 0.0053(2) D for the dipole moment, and (α∥ - α⊥) = 4.26(6) • 10-24 cm3 , for the polarizability anisotropy.
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48

Samdani, Md Shareefuddin, G. Ramadevudu, S. Laxmi Srinivasa Rao et M. Narasimha Chary. « Physical, Optical, and Spectroscopic Studies on MgO-BaO-B2O3 Glasses ». ISRN Ceramics 2013 (24 décembre 2013) : 1–11. http://dx.doi.org/10.1155/2013/419183.

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The mixed alkaline effect in double alkaline borate glasses MgO-BaO-B2O3 containing small proportions of copper oxide (CuO) has been studied. The glass samples are characterized by optical absorption, electron paramagnetic resonance (EPR), and Fourier transform infrared spectroscopy (FTIR). A red shift in optical absorption peaks with increasing MgO (decreasing BaO) concentration has been observed. The values of “g” tensor and hyperfine “A” tensor have shown inflections with glass composition. The number of spins (N) and paramagnetic susceptibility (χ) also exhibited mixed alkaline effect. The broadening of glass network with increase in MgO concentration is found from the FTIR spectra. Interestingly both density and molar volume have shown decreasing trend with glass composition. The optical band gaps exhibited a nonlinear compositional dependence. As expected, the glass samples possessed higher values of optical basicity (Λ), molar electronic polarizability (αm), and Urbach energy (ΔE).
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49

Oliveira, Micael J. T., Alberto Castro, Miguel A. L. Marques et Angel Rubio. « On the Use of Neumann's Principle for the Calculation of the Polarizability Tensor of Nanostructures ». Journal of Nanoscience and Nanotechnology 8, no 7 (1 juillet 2008) : 3392–98. http://dx.doi.org/10.1166/jnn.2008.142.

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The polarizability measures how the system responds to an applied electrical field. Computationally, there are many different ways to evaluate this tensorial quantity, some of which rely on the explicit use of the external perturbation and require several individual calculations to obtain the full tensor. In this work, we present some considerations about symmetry that allow us to take full advantage of Neumann's principle and decrease the number of calculations required by these methods. We illustrate the approach with two examples, the use of the symmetries in real space and in spin space in the calculation of the electrical or the spin response.
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50

Adamski, P. « Hindered Rotation as the Cause of Change in Polarizability Tensor Scalar of Mesogenic Molecules ». Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics 177, no 1 (décembre 1989) : 1–11. http://dx.doi.org/10.1080/00268948908047766.

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