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61.
Intense magnetic dipole scattering that has been observed recently in several transparent insulators arises nonlinearly and saturates as predicted by classical theory, but also varies with electronic structure of the medium. 相似文献
62.
The microstructures and phases of as-cast Mg-Zn-Y alloys were investigated by means of scanning electron microscopy (SEM), energy-dispersive spectrum (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) in this study. Stable icosahedral Mg30Zn60Y10 quasicrystals were obtained using common casting technique. With increasing Y content, the contents of quasicrystals increased, the distribution of quasicrystals was improved, and the morphologies of quasicrystal and other microstructures of Mg-Zn-Y alloys showed different characteristics. In addition, the solidification process of Mg-Zn-Y alloys was analyzed. Icosahedral Mg30Zn60Y10 quasicrystalline phase is easy to nucleate in slow cooling. 相似文献
63.
Precision Calculations of Atomic Polarizabilities: A Relevant Physical Quantity in Modern Atomic Frequency Standard
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Electric dipole polarizabilities of atoms are very important in many different physical applications, such as the precision atomic frequency standard. Calculations of these properties are very important and challenging. We propose a calculation strategy to calculate the frequency dependent dipole polarizabilities with high precision variationally by using a set of high quality orbital bases where the electron correlations can be taken into account adequately. The static polarizabilitiez of the ground state of Na are calculated accurately by such a method and can be compared with precision experiment measurement directly. The calculation result is in excellent agreement with the available experimental measurements within about 0.1~, which demonstrates the validity of our strategy. Our calculation strategy has a wide usage, not only in polarizibilies, but also in other fields such as theoretical treatment of electron-atom scattering processes. Using the same orbital bases, we carry out precision calculation of Na- affinities. Our calculated affinity is in excellent agreement with precision laser spectroscopy measurements within 0. 1%. 相似文献
64.
T.M. Poletika L.B. Zuev A.A. Nor 《Applied Physics A: Materials Science & Processing》2001,73(5):601-603
The dislocation structure of the deforming Zr+1% Nb alloy in the stage of parabolic work hardening was examined by the technique
of transmission electron microscopy (TEM). The faulted structure of the material is found to vary both qualitatively and quantitatively
in the regions corresponding with the zones of local strain maxima and minima. The data on the density of different types
of defect in the above zones have been analyzed.
Received: 19 December 2000 / Accepted: 20 December 2000 / Published online: 23 March 2001 相似文献
65.
G. Grégoire M. Mons C. Dedonder-Lardeux C. Jouvet 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,1(1):5-7
clusters (solvents being , or ) have been studied by resonance enhanced two photons ionization, leading to the detection of clusters. When water is the solvent, large clusters up to n>50 can be observed, whereas for and no clusters larger than 10 could be evidenced. Because the first step in the ionization process is the excitation from the
ground solvated () ion pair state to a covalent excited state, the differences in the cluster size distribution for different solvent may be
interpreted as a difference in cluster structures leading to a difference in the charge separation in the ground state.
Received: 30 September 1997 / Revised in final form: 30 October 1997 / Accepted: 30 October 1997 相似文献
66.
Svilen Bobev 《Solid State Communications》2004,131(7):431-433
Thermal expansion and magnetic susceptibility measurements as a function of temperature are reported for YbGaGe. Despite the fact that this material has been claimed to show zero thermal expansion over a wide temperature range, we observe thermal expansion typical of metals and Pauli paramagnetic behavior, which perhaps indicates strong sample dependence in this system. 相似文献
67.
Gilberto Teobaldi 《Journal of luminescence》2005,111(4):335-342
We use a combination of molecular dynamics and quantum chemical calculations to investigate the photophysics of Eosin Y encapsulated in a fourth generation of poly-propylene amine dendrimer functionalized in the periphery with dansyl units. Once in contact with the macromolecule, the guests display a double exponential decay of the excited states that is reproduced by the present model. 相似文献
68.
We consider the oscillating dark energy with periodic equation of state in two equivalent formulations: ideal fluid or scalar–tensor theory. It is shown that such dark energy suggests the natural way for the unification of early-time inflation with late-time acceleration. We demonstrate how it describes the transition from deceleration to acceleration or from non-phantom to phantom era and how it solves the coincidence problem. The occurrence of finite-time future singularity for the oscillating (phantom) universe is also investigated. 相似文献
69.
Received: 14 September 1998 相似文献
70.
The crystal structure of the RTiGe3 compounds (R=La, Ce and Pr) has been studied by X-ray powder diffraction methods; Rietveld refinement has been carried out on the La homologue. These compounds crystallise in the BaNiO3 prototype structure, hP10-P63/mmc, also called the hexagonal perovskite (a=6.300(1), c=5.915(1) Å for LaTiGe3). This seems to be the first example in which an intermetallic phase adopts such a structure type which can be considered as derived from the Ni3Sn type (anti) by a distortion of the lattice and the occupation of the quasi-octahedral 2a site at the origin of the cell (0, 0, 0) by Ti. The composition, also confirmed by microprobe analyses, was found to be strictly 1:1:3 indicating that these are line compounds, forming very likely by a peritectoid reaction. The existence of homologous compounds has been established for the lighter rare earths La, Ce and Pr. Heat capacity and magnetisation data show that CeTiGe3 orders ferromagnetically with a Curie temperature of nearly 14 K. On the other hand a−ln T variation of the magnetic part of the resistivity below 300 K is consistent with that expected for single impurity Kondo behaviour. CeTiGe3 is thus an uncommon example of a ferromagnetic dense Kondo lattice. 相似文献