排序方式: 共有27条查询结果,搜索用时 265 毫秒
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Jamelot G. Jaegle P. Carillon A. Gadi F. Gauthe B. Guennou H. Klisnick A. Moller C. Sureau A. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1988,16(5):497-504
The X-ray laser program at Palaiseau is based on the recombination scheme in lithiumlike ions, which requires a moderate pump power and seems to be promising for the purpose of scaling to shorter wavelengths. In aluminum plasmas, peak gain values of 2-2.5 cm-1 have been obtained at a wavelength of 105.7 Å corresponding to the 3d -5f transition, 6 ns after the top of a 2 ns laser pulse. The same transition in sulfur is emitted at 65.2 Å and has shown a gain of 1 cm-1 in a preliminary time-integrated experiment. Simulations using a collisional-radiative model as the postprocessor of a hydrodynamic numerical code predict amplifications for the 3d -4f , 3d -5f , and 4d -5f transitions. A new experiment, in progress at the present time, has been designed to enhance the gain-length product up to 10-15 at 105.7 Å. The recently extended facilities of the LULI make it possible to produce a 6-cm-long plasma column, keeping the flux density at the same level as in the previous experiments 相似文献
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We report a pressure-dependent investigation of KMnF(3) by x-ray diffraction up to 30 GPa. The results are discussed in the framework of Landau theory and in relation to the isostructural phase transition in SrTiO(3). The phase transition temperature near 186 K in KMnF(3) shifts to room temperature at a critical pressure of P(c) = 3.4 GPa; the pressure dependence of the transition point follows ΔP(c)/ΔT(c) = 0.0315 GPa K(-1). The transition becomes second order under high pressure, close to the tricritical point. The phase transition is determined by the rotation of MnF(6) octahedra with their simultaneous expansion along the rotation axis. The rotation angle was found to increase to 10.5° at 24 GPa. An additional anomaly was observed at higher pressure around 25 GPa, suggesting a further phase transition. 相似文献
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Actis P Manesse M Nunes-Kirchner C Wittstock G Coffinier Y Boukherroub R Szunerits S 《Physical chemistry chemical physics : PCCP》2006,8(42):4924-4931
This paper describes the functionalization of oxidized boron-doped diamond (BDD) electrodes with N-(3-trimethoxysilylpropyl)pyrrole (TMPP) and the influence of this layer on the electrochemical transfer kinetics as well as on the possibility of forming strongly adhesive polypyrrole films on the BDD interface through electropolymerization. Furthermore, localized polymer formation was achieved on the TMPP-modified BDD interface using the direct mode of a scanning electrochemical microscope (SECM) as well as an electrochemical scanning near-field optical microscope (E-SNOM). Depending on the method used polypyrrole dots with diameters in the range of 1-250 microm are electrogenerated. 相似文献
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D. Benredjem V. Bommier H. Guennou C. Möller A. Sureau 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,2(1):83-87
In order to solve the radiative-transfer equation for polarized beams propagating in plasmas a matrix approach is applied.
The solution is the four-components Stokes vector, and the effect of the medium on the state of the radiation is represented
by an amplification operator. Our approach is applied to the neon-like germanium 23.6 nm line, when a right-circularly polarized
beam is injected into an amplifying plasma. The conditions governing the recovery of the initial polarization state are investigated
over the entire spectrum of the output.
Received: 10 October 1997 / Revised: 12 January 1998 / Accepted: 27 January 1998 相似文献
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Mael Guennou Hichem Dammak Philippe Djémia Philippe Moch Pham-Thi Mai 《Solid State Sciences》2010,12(3):298-301
In this paper, we compare the electromechanical properties of tetragonal single domain PZN–12%PT single crystals obtained by different methods: resonance–antiresonance method, Brillouin scattering, and resonant ultrasound spectroscopy. The agreement between the different measurements is found satisfactory for many elastic constants within experimental uncertainties. Differences are notable for the elastic constants associated to the propagation of shear waves (c66E and c44E). This can be accounted for by imperfections of the sample in acoustic spectroscopy and specific difficulties of shear resonators used for the resonance method. Strong discrepancies are noted for the hardened elastic constant c33D associated to longitudinal waves propagating along the polarization direction; we suggest this can arise from a frequency dependence of the dielectric constant. 相似文献
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P. Jaeglé A. Carillon B. Gauthé P. Goedtkindt H. Guennou G. Jamelot A. Klisnick C. Möller B. Rus A. Sureau P. Zeitoun 《Applied physics. B, Lasers and optics》1993,57(5):313-318
In this paper we present the recent results obtained on X-ray lasers with the new facility of LULI (Palaiseau, France). As regards the study of collisional-excitation pumping we show that the J=0–1 line of neon-like zinc, at 212 Å, exhibits a surprisingly large gain coefficient of 4.9 cm–1. A detailed comparison of the time-dependent intensities of the J=0–1 and the J=2–1 line at 267 Å leads to the conclusion that these two lines are not emitted in the same region of the plasma. On the other hand we performed a theoretical and experimental study of 5g-4f lasing line of lithium-like sulphur at 206.5 Å. For the first time, in the case of plasma recombination pumping, we did not observe any reduction of the gain coefficient when the plasma length is raised from 1 cm to 2 cm. From numerical simulation this is likely due to radiation trapping and similar processes having much less influence on 5g-4f population inversion than on previously observed lithium-like lasing transitions. These results show that large gain-length values should be obtained with 0.5 kJ driving laser pulses. 相似文献