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Journal of Applied Physics : Relaxation time effects on dynamic co...

By: D. J. Shelton, T. Sun, J. C. Ginn, K. R. Coffey, and G. D. Boreman

Description: The behavior of nanoscale infrared antenna elements depends upon the dynamic conductivity of thin metallic films. Spectroscopic ellipsometer measurements of noble metal films show that when the product of the incident radiation frequency and the relaxation time is greater than unity, anomalous dynamic electron transport effects occur. In this regime electron scattering increases the conductivity of alloyed metallic films as demonstrated by ellipsometry measu...

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Review of Scientific Instruments : High-resolution Rydberg tagging...

By: Brant Jones, Jingang Zhou, Lei Yang, and C. Y. Ng

Description: By coupling a comprehensive tunable vacuum ultraviolet (VUV) laser system to a velocity-mapped ion imaging apparatus, we show that high-resolution high-n Rydberg tagging time-of-flight (TOF) measurements of nascent atomic photofragments formed by laser photodissociation can be made using single-photon VUV laser photoexcitation. To illustrate this single-photon Rydberg tagging TOF method, we present here the results of the VUV laser high-n Rydberg tagging TOF...

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Physics of Fluids : The influence of gravity on the steady propaga...

By: Andrew L. Hazel and Matthias Heil

Description: Motivated by discrepancies between recent bench-top experiments [ A. Juel and A. Heap, J. Fluid Mech. 572, 287 (2007) ] and numerical simulations [ A. L. Hazel and M. Heil, ASME J. Biomech. Eng. 128, 573 (2006) ] we employ computational methods to examine the effects of transverse gravity on the steady propagation of a semi-infinite, inviscid air finger into a two-dimensional elastic channel filled with a Newtonian fluid. The special case of propagation in a...

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Biblioteca Hispanica : Programme Notions of Natural Science for Sc...

By: Luis Nata Gayoso
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Journal of Applied Physics : High-performance C60 n-channel organi...

By: Xiao-Hong Zhang and Bernard Kippelen

Description: High-performance C60 organic field-effect transistors (OFETs) have been obtained by engineering the essential electrode/semiconductor and dielectric/semiconductor interfaces. By using calcium (Ca) as the source and drain electrodes, the width-normalized contact resistance (RCW) at the electrode/semiconductor interface for devices with channel lengths ranging from 200 down to 25 μm could be reduced to a constant value of 2 kΩ cm at a gate-source voltage (VGS)...

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Journal of Applied Physics : On PbTiO3-(111)-Pt interfacial layers...

By: S. Habouti, C-H. Solterbeck, M. Es-Souni, and V. Zaporojtchenko

Description: In this work emphasis is placed on the investigation of interfacial layers between sol-gel processed PbTiO3 (PTO) thin films and (111)Pt terminated silicon substrates. The methods used are x-ray diffraction, x-ray photoelectron spectroscopy (XPS) combined with depth profiling, and atomic force microscopy (AFM). In order to avoid artifacts related to ion bombardment, e.g., reduction of Pb ions and preferential sputtering, gentle argon ion bombardment conditio...

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Journal of Applied Physics : Characterization of dilute InPN layer...

By: T. D. Das, S. Dhar, and B. M. Arora

Description: We have grown dilute InPN layers by liquid phase epitaxy and characterized them using high resolution x-ray diffraction, optical absorption, low temperature photoluminescence, and Hall measurement techniques. Our results indicate that a maximum amount of 0.2% nitrogen has been incorporated in the material with a band gap lowering consistent with expectations. The crystalline quality of the material is found to improve upon nitrogen incorporation. Large incre...

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Journal of Applied Physics : Ultraviolet light in glow discharges

By: Loic Ledernez, Fethi Olcaytug, Hirotsugu Yasuda, and Gerald Urban

Description: The use of ultraviolet light has prevailed in investigation of gas breakdown phenomena since Townsend developed the model of gas breakdown discharge carrying his name because ultraviolet light creates the supposedly necessary electrons in the interelectrode space. However, the ultraviolet light influences the gas breakdown characteristics. Therefore, the extent of the influence of the ultraviolet light on the prebreakdown current, the breakdown current, the ...

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Physics of Plasmas : Consistent solution for space-charge-limited ...

By: Y. Feng and J. P. Verboncoeur

Description: The solution for space-charge-limited (SCL) currents in electron vacuum diodes with monoenergetic initial velocity is extended to the relativistic regime. Two types of solutions are found: Type I corresponds to zero steady state surface electric field (field emission with high enhancement factor), and Type II corresponds to a finite steady state surface electric field (other emission mechanisms). Our solution compares well to the classical space-charge-limit...

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Biblioteca Hispanica : Elements of Natural History for Use by Seco...

By: Serafin Homes and Abad
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Biblioteca Hispanica : the Water on Earth Studies on the Origin Re...

By: Silvino Thos and Codina

Description: Hydrology

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Journal of Mathematical Physics : Weyl quantization of fractional ...

By: Vasily E. Tarasov

Description: The quantum analogs of the derivatives with respect to coordinates qk and momenta pk are commutators with operators Pk and Qk. We consider quantum analogs of fractional Riemann–Liouville and Liouville derivatives. To obtain the quantum analogs of fractional Riemann–Liouville derivatives, which are defined on a finite interval of the real axis, we use a representation of these derivatives for analytic functions. To define a quantum analog of the fractional Li...

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Journal of Applied Physics : Optical emission from a high-refracti...

By: Yuji Kuwamura, Minoru Yamada, Ryuichi Okamoto, Takeshi Kanai, and Hesham Fares

Description: An optical emission scheme was demonstrated, in which a high-refractive-index waveguide is excited by a traveling electron beam in a vacuum environment. The waveguide was made of Si–SiO2 layers. The velocity of light propagating in the waveguide was slowed down to 1/3 of that in free space due to the high refractive index of Si. The light penetrated partly into the vacuum in the form of a surface wave. The electron beam was emitted from an electron gun and p...

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The Journal of Chemical Physics : Structure of gold atoms on stoic...

By: Changjun Zhang, Angelos Michaelides, David A. King, and Stephen J. Jenkins

Description: Within the framework of the GGA+U implementation of density functional theory, we investigate atomistic and electronic structures of Au adsorbed on the stoichiometric and the defective CeO2{111} surfaces, in the latter of which either O or Ce vacancies are presented. We show that on the stoichiometric surface, the most stable adsorption site of Au is not on the top of the outermost O atoms, as previously suggested, but on a bridgelike site in which the Au di...

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Journal of Applied Physics : Characteristics of amorphous Ag0.1(Ge...

By: Ki-Ho Song, Sung-Won Kim, Jae-Hee Seo, and Hyun-Yong Lee

Description: An amorphous chalcogenide Ge2Sb2Te5 film is most commonly used for phase-change data storage, in which its small volume is switched between amorphous and crystalline states by local heating with short laser or current pulses. A speed of amorphous-to-crystalline phase transformation in Ge2Sb2Te5 and Ag0.1(Ge2Sb2Te5)0.9 films has been evaluated on a nanosecond time scale using a 658-nm laser beam. The focused laser beam with a diameter <10 μm was illuminated i...

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The Journal of Chemical Physics : On the accuracy of density-funct...

By: Biswajit Santra, Angelos Michaelides, Martin Fuchs, Alexandre Tkatchenko, Claudia Filippi et al

Description: Second order Møller–Plesset perturbation theory at the complete basis set limit and diffusion quantum Monte Carlo are used to examine several low energy isomers of the water hexamer. Both approaches predict the so-called prism to be the lowest energy isomer, followed by cage, book, and cyclic isomers. The energies of the four isomers are very similar, all being within 10–15 meV/H2O. These reference data are then used to evaluate the performance of several de...

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Journal of Applied Physics : Nanoindentation-induced plastic defor...

By: Z. H. Sun and K. W. White

Description: The plastic deformation and fracture behavior of individual a- and c-domains of (001) oriented BaTiO3 single crystal are studied with nanoindentation and atomic force microscopy. Consistent with previous observations in rocksalt and perovskite crystals, square-shaped pileups directly surround the residual indents, and rosette arm patterns extend beyond these pileups. These features have been ascribed to dislocation activities on the {110}〈10〉 slip systems in...

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Applied Physics Letters : Analysis on the mechanism of photolumine...

By: Ying-hui Wang, Ya-jing Peng, Yue-qi Mo, Yan-qiang Yang, and Xian-xu Zheng

Description: Photoinduced oxidation process of poly [2-methoxy-5- (2' -ethyl-hexyloxy) -1,4-phenylene vinylene] is probed by using broadband transient grating technique. The results suggest that the damage of bonds in the side and main chains leads to the line shape variation and efficiency decreasing of luminescence in photoluminescence quenching, and their temporal evolution and damage rates are found to vary with molecular energy states.

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Applied Physics Letters : The enhancement of ZnO nanowalls photoco...

By: F. Fang, D. X. Zhao, B. H. Li, Z. Z. Zhang, J. Y. Zhang et al

Description: 10 nm sized hexagonal CdS nanoparticles were decorated on the surface of well-aligned ZnO nanowall through a facile hydrothermal approach. The effects of CdS-cap layer on the optical and photoelectrical properties of ZnO nanowalls have been studied. It was found the CdS acted not only as a passivation layer to suppress the detrimental surface states of ZnO nanowalls, which reduced the deep-level emissions, but also as an interfacial carrier transport layer t...

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Journal of Applied Physics : Effects of indium segregation on opti...

By: Tomoya Inoue, Masataka Mamizuka, Hiroshi Mizuno, Osamu Kojima, Takashi Kita et al

Description: The emission wavelength of InAs quantum dots (QDs) capped by GaAs is found to be systematically controlled by doping nitrogen on the QDs surface with a thin spacer layer in between QDs and the nitrogen-doped layer. Cross-sectional transmission electron microscope images of the nitrogen-doped QD indicate that the nitrogen-doped layer acts as a blocking layer for In segregation. Furthermore, the in-plane linear polarization of the emission has been demonstrate...

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