Готові списки джерел за темами / Electron-optic parameters

Добірка наукової літератури з теми "Electron-optic parameters"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Electron-optic parameters"

Huang, Kai, Hideyuki Kotaki, Michiaki Mori, Yukio Hayashi, Nobuhiko Nakanii, and Masaki Kando. "Single-Shot Electro-Optic Sampling on the Temporal Structure of Laser Wakefield Accelerated Electrons." Crystals 10, no. 8 (July 24, 2020): 640. http://dx.doi.org/10.3390/cryst10080640.

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Particle acceleration driven by a high power Ti: sapphire laser has invoked great interest worldwide because of the ultrahigh acceleration gradient. For the aspect of electron acceleration, electron beams with energies over GeV have been generated using the laser wakefield acceleration mechanism. For the optimization of the electron generation process, real-time electron parameter monitors are necessary. One of the key parameters of a high energy particle beam is the temporal distribution, which is closely related with the timing resolution in a pump-probe application. Here, we introduced the electro-optic sampling method to laser wakefield acceleration. Real-time multibunch structures were observed. Careful calculations on the physical processes of signal generation in an electro-optic crystal were performed. Discussions of the methodology are elaborated in detail.

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BISTI, V. E. "MAGNETOPLASMONS IN SYMMETRY DRIVEN BILAYER ELECTRON SYSTEM." International Journal of Modern Physics B 21, no. 08n09 (April 10, 2007): 1555–57. http://dx.doi.org/10.1142/s021797920704318x.

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The effect of space symmetry on magnetoplasmon charge density excitations in a weekly tunnel coupled bilayer electron system is considered. The magnetic field corresponds to the filling factor ν = 4. The energy of optic magnetoplasmon is not affected by space symmetry. Three other collective magnetoplasmon modes are determined by relations between parameters of asymmetry, tunnel parameter and energy of acoustic plasmon.

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Thomas, Jeena, Prakash Perikaruppan, Vinoy Thomas, Jancy John, Raji Mary Mathew, Joice Thomas, Ibrahimkutty Rejeena, Sebastian Mathew, and Abdulhassan Mujeeb. "Green Synthesized Plasmonic Silver Systems for Potential Non-Linear Optical Applications: Optical Limiting and Dual Beam Mode Matched Thermal Lensing." Australian Journal of Chemistry 72, no. 6 (2019): 460. http://dx.doi.org/10.1071/ch18617.

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Bioactive compound functionalized plasmonic systems are evolving as a promising branch of nanotechnology. In this communication the synthesis of bioactive compound mimosine-based silver nanoparticles (AgNPs) and their non-linear optical and thermo-optic properties are presented. UV-Visible spectroscopy, optical bandgap measurement, fluorescence spectroscopy, and high-resolution transmission electron microscopy (HRTEM) techniques were used to characterize the synthesized AgNPs. An open aperture z-scan technique was used to determine the non-linear optical parameters. A very strong reverse saturable absorption (RSA) and low optical limiting threshold were observed for the present mimosine decorated AgNP system. The thermo-optic property of the present system was evaluated using a highly sensitive dual beam mode matched thermal lensing spectroscopic technique. A comparison of the low limiting threshold (242MWcm−2) and thermo-optic property (thermal diffusivity, D=1.13×10−7m2s−1) with similar systems proves its capability for non-linear optical and thermo-optic applications.

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ARABSHAHI, HADI. "CALCULATION OF THE ELECTRON DRIFT MOBILITY IN Cr2+:ZnS AND Cr2+:ZnSe MATERIALS BY RODE ITERATION MODEL." International Journal of Modeling, Simulation, and Scientific Computing 01, no. 04 (December 2010): 469–75. http://dx.doi.org/10.1142/s1793962310000262.

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The results of electron drift velocity in Cr2+:ZnS , and Cr2+:ZnSe are calculated for different temperatures, free-electron concentrations and compositions. The two-mode nature of the polar optic phonons is considered jointly with deformation potential acoustic, piezoelectric, alloy and ionized-impurity scattering. Band non-parabolocity, admixture of p functions, arbitrary degeneracy of the electron distribution, and the screening effects of free carriers on the scattering probabilities are incorporated. The Boltzmann equation is solved by an iterative technique using the currently established values of the material parameters. The iterative results are in fair agreement with other recent calculations obtained using the relaxation-time approximation and experimental methods.

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Qi, Guochen, Di Tian, Guolun Gao, Guangda Liu, Chunling Qiu, and Tao Long. "Numerical Simulations and the Design of Magnetic Field-Enhanced Electron Impact Ion Source with Hollow Cylinder Structure." Journal of Analytical Methods in Chemistry 2020 (January 25, 2020): 1–7. http://dx.doi.org/10.1155/2020/2809485.

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An electron impact ion source-adopted magnetic field-enhanced technology has been designed for enhancing the electron intensity and the ionization efficiency. Based on the ion optic focus mechanism, an electron impact ionization source was designed, and the electron entrance into the ionization chamber was designed with a hollow cylinder structure to improve the ion extraction efficiency. Numerical simulation and optimal geometry were optimized by SIMION 8.0 to provide higher electron intensity and ion transmission efficiency. To improve the electron intensity, the influence of the filament potential and magnetic intensity was investigated, and the values of 70 eV and 150 Gs were chosen in our apparatus. Based on the optimal parameters, the air in the lab and oxygen gas was detected by the homemade apparatus, and the ion intensity was detected in the positive and negative ion modes, respectively. The homemade electron impact ion source apparatus has the potential to enhance ionization efficiency applied in the mass spectrometer ionization source.

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Vintaikin, B. Е., O. V. Kondakov, and K. G. Ivanov. "Determining Anisotropic Material Properties by Means of Simulating Transmission in a Planar Waveguide." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 83 (2019): 51–63. http://dx.doi.org/10.18698/1812-3368-2019-2-51-63.

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The paper presents investigation results concerning a magneto-optic effect occurring in the far infrared range in bismuth. The investigation involves recording transmission in a planar waveguide located in a variable magnetic field. We ran a numerical simulation of the magneto-optic spectrum shapes in the relaxation-time approximation and determined a set of parameters for the electron energy spectrum in bismuth in the effective mass tensor approximation. We found that there is a discrete function describing how relaxation time and charge carrier concentration depend on the magnetic field magnitude. The function stems from the presence of electrons with different effective masses, which are concentrated in the three equivalent L points of the Brillouin zone, and holes in the T point of the Brillouin zone, which have topologically unconnected anisotropic constant energy surfaces

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DONG, HUI-NING, DAVID J. KEEBLE, and SHAO-YI WU. "THEORETICAL EXPLANATIONS OF THE SPIN HAMILTONIAN PARAMETERS FORCu2+ION INLaSrAl1-xCuxO4SOLID SOLUTION." International Journal of Modern Physics B 21, no. 18n19 (July 30, 2007): 3174–76. http://dx.doi.org/10.1142/s0217979207044123.

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It is of interest for layered oxides containing copper because they are related to high temperature superconductivity. Among them, LaSrAl1-xCuxO4solid solution has received much attention due to its elastic and elasto-optic properties and application as promising substrate for high- Tcsuperconducting thin films. So many theoretical and experimental works have been done to understand the several characteristics of the LaSrAl1-xCuxO4materials. In this paper, the electron paramagnetic resonance g factors g//, g⊥and hyperfine structure constants A//, A⊥for the tetragonal Cu2+center in LaSrAl1-xCuxO4solid solution are theoretically explained by the method of diagonalizing the full Hamiltonian matrix. The related crystal field parameters are calculated from the superposition model and the local structural parameters of the impurity Cu2+occupying the host Al3+site. The superposition model parameters used in this work are comparable with those for similar tetragonal ( CuO6)10-clusters in the previous works. The calculated results are in reasonable agreement with the observed values. The results are discussed.

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de La Rochefoucauld, Ombeline, Guillaume Dovillaire, Fabrice Harms, Mourad Idir, Lei Huang, Xavier Levecq, Martin Piponnier, and Philippe Zeitoun. "EUV and Hard X-ray Hartmann Wavefront Sensing for Optical Metrology, Alignment and Phase Imaging." Sensors 21, no. 3 (January 28, 2021): 874. http://dx.doi.org/10.3390/s21030874.

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For more than 15 years, Imagine Optic have developed Extreme Ultra Violet (EUV) and X-ray Hartmann wavefront sensors for metrology and imaging applications. These sensors are compatible with a wide range of X-ray sources: from synchrotrons, Free Electron Lasers, laser-driven betatron and plasma-based EUV lasers to High Harmonic Generation. In this paper, we first describe the principle of a Hartmann sensor and give some key parameters to design a high-performance sensor. We also present different applications from metrology (for manual or automatic alignment of optics), to soft X-ray source optimization and X-ray imaging.

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Erkan, Sultan, and Duran Karakaş. "A theoretical study on cyclometalated iridium (III) complexes by using a density functional theory." Journal of Theoretical and Computational Chemistry 19, no. 02 (March 2020): 2050006. http://dx.doi.org/10.1142/s0219633620500066.

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Cyclometalated iridium (III) complexes (Ir1–Ir4) are calculated in detail with computational chemistry methods. The calculated structural parameters of Ir3 are compared with experimental values and a good fit is obtained. IR spectra are calculated at B3LYP/LANL2DZ/6-31G(d) level in the gases phase. Calculated 1H-NMR chemical shift values of the mentioned complexes are compared with the experimental data and all chemical shifts are assigned to the respective atoms. The quantum chemical parameters such as absolute hardness ([Formula: see text]), absolute softness ([Formula: see text]) electronegativity ([Formula: see text]), chemical potential ([Formula: see text]) and electronic charges ([Formula: see text]) are calculated and are associated with the experimental anti-cancer properties of the related complexes. Nonlinear optic properties of the Ir1–Ir4 were investigated with the average linear polarizability ([Formula: see text]), the anisotropy of the polarizability ([Formula: see text]), first hyperpolarizability ([Formula: see text]) values. Hole transfer ([Formula: see text]), electron transfer integrals ([Formula: see text]), hole reorganization energies ([Formula: see text]) and electron reorganization energies ([Formula: see text]) are examined. In addition, molecular docking study was performed. It was found that the molecular docking results are similar to the experimental anti-cancer trend.

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Schroer, Christian G., and Gerald Falkenberg. "Hard X-ray nanofocusing at low-emittance synchrotron radiation sources." Journal of Synchrotron Radiation 21, no. 5 (August 29, 2014): 996–1005. http://dx.doi.org/10.1107/s1600577514016269.

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X-ray scanning microscopy relies on intensive nanobeams generated by imaging a highly brilliant synchrotron radiation source onto the sample with a nanofocusing X-ray optic. Here, using a Gaussian model for the central cone of an undulator source, the nanobeam generated by refractive X-ray lenses is modeled in terms of size, flux and coherence. The beam properties are expressed in terms of the emittances of the storage ring and the lateral sizes of the electron beam. Optimal source parameters are calculated to obtain efficient and diffraction-limited nanofocusing. With decreasing emittance, the usable fraction of the beam for diffraction-limited nanofocusing experiments can be increased by more than two orders of magnitude compared with modern storage ring sources. For a diffraction-limited storage ring, nearly the whole beam can be focused, making these sources highly attractive for X-ray scanning microscopy.

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Дисертації з теми "Electron-optic parameters"

Тугай, Сергій Борисович. "Імпульсні режими роботи технологічних електронно-променевих гармат високовольтного тліючого розряду". Doctoral thesis, Київ, 2013. https://ela.kpi.ua/handle/123456789/6373.

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Vähäkangas, J. (Jarkko). "Extended and finite graphenes:computational studies of magnetic resonance and magneto-optic properties." Doctoral thesis, University of Oulu, 2016. http://urn.fi/urn:isbn:9789526208619.

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Abstract In this thesis, the magnetic resonance and magneto-optical rotation parameters are studied in single-layer carbon systems of two different dimensionalities. Based on electronic structure calculations, the spectral parameters are predicted for both extended (2D) and finite, molecular (0D) systems consisting of pure sp²-hybridised pristine graphene (G), as well as hydrogenated and fluorinated, sp³-hybridised graphene derivatives, graphane (HG) and fluorographene (FG), respectively. Nuclear magnetic resonance (NMR) parameters are calculated for G, HG and FG systems at their large-system limit. For their 0D counterparts, graphene flakes, qualitative spectral trends are predicted as functions of their size and perimeter type. The last group of studied carbon systems consists of 2D graphenes containing spin-1/2 paramagnetic defects. Electron spin resonance (ESR) parameters and paramagnetic NMR shieldings are predicted for four different paramagnetic systems, including the vacancy-defected graphane and fluorographene, as well as graphene with hydrogen and fluorine adatoms. The magneto-optic properties of G and HG flakes are studied in terms of Faraday optical rotation and nuclear spin optical rotation parameters, to investigate the effects of their finite size and also the different level of hydrogenation. All the different investigated parameters displayed characteristic sensitivity to the electronic and atomic structure of the studied graphenes. The parameters obtained provide an insight into the physics of these 0D and 2D carbon materials, and encourage experimental verification.

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Тези доповідей конференцій з теми "Electron-optic parameters"

Wu, Ye, Wang Cheng, and Chen Wen. "A method to determine the parameters of infrared camera in the electron optic tracking system of UAV." In Conference on Optical Sensing and Imaging Technology, edited by Dong Liu, Xiangang Luo, Yadong Jiang, and Jin Lu. SPIE, 2020. http://dx.doi.org/10.1117/12.2574985.

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