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排序方式: 共有104条查询结果,搜索用时 15 毫秒
91.
R.?M.?EreminaEmail author V.?F.?Tarasov K.?B.?Konov T.?P.?Gavrilova A.?V.?Shestakov V.?A.?Shustov S.?A.?Kutovoi Yu.?D.?Zavartsev 《Applied magnetic resonance》2018,49(1):53-60
The Sc2SiO5 single crystals doped with 0.001 at.% of the 143Nd3+ ion were studied by continuous-wave and pulse electron paramagnetic resonance methods. The g-tensors and hyperfine structure tensors for two magnetically non-equivalent Nd ions were obtained. The spin–spin and spin–lattice relaxation times were measured at 9.82 GHz in the temperature range from 4 to 10 K. It was established that three relaxation processes contribute to the spin–lattice relaxation processes. There are one-phonon spin–phonon interaction, two-phonon Raman interaction and two-phonon Orbach–Aminov relaxation processes. It was established that spin–spin relaxation time is of the same magnitude for neodymium ion doped in Sc2SiO5 and in Y2SiO5. 相似文献
92.
T.V. Kononenko M. Meier M.S. Komlenok S.M. Pimenov V. Romano V.P. Pashinin V.I. Konov 《Applied Physics A: Materials Science & Processing》2008,90(4):645-651
We report the fabrication of graphitic microstructures in the bulk of chemical vapor deposited (CVD) diamond using 120-fs
laser pulses at 800-nm wavelength. The nature of the laser-modified region and generation of mechanical stresses in the surrounding
diamond is studied with Raman spectroscopy. A spontaneous growth of the laser-modified region from the focal plane towards
the laser has been visualized in the process of multipulse irradiation with different pulse energies. The formation of discrete
or continuous graphitized structures is revealed depending on the varied local laser intensity. The physical processes governing
the appearance of separate graphitic globules and continuous extension of the graphitized region are discussed. Controlling
the laser irradiation conditions permits us to fabricate graphitic wires with typical length of 150 μm and diameter of 1.5 μm.
The longer, 300-ps pulses, as applied to laser microstructuring of the CVD diamond bulk, are found to be inappropriate due
to the stronger influence of structural defects on the damage threshold, the noticeable fluctuation of the structure diameter
over the length and the pronounced cracking of the surrounding diamond.
PACS 42.62.-b; 61.80.Ba 相似文献
93.
V.V. Kocharovsky VI.V. Kocharovsky 《Physica C: Superconductivity and its Applications》1992,200(3-4):385-402
The Green's function method and diagram technique for umklapp electron-electron scattering mediated by the screened Coulomb interaction in layered anisotropic conductors are examined. Gor'kov-type equations and their general solution for anomalous and normal temperature Green's functions are derived taking into account umklapp scattering of all orders. Explicit equations for dielectric and superconducting order parameters, including coexistent Bragg and BCS pairing, are found. The possibility of the first-order phase transition to the superconducting state is discussed. The theory elucidates the origin of Bragg-Coulomb high-Tc superconductivity, proposed by the authors. 相似文献
94.
V. P. Pashinin N. Yu. Konstantinov V. G. Artjushenko V. I. Konov A. S. Silenok G. Muller B. Schaldach R. Ulrich 《Fiber and Integrated Optics》1991,10(4):365-372
An alteration of absorption spectra of fused silica fibers under delivery of high-power (ultraviolet) UV laser radiation (4th harmonic of the Nd:YAG laser, wavelength 266 nm) was studied in comparison with their photoluminescent properties. Tested fibers were produced by various technologies based on PMCVD methods. The nature of defects responsible for UV absorption in fibers and the mechanisms of their photogeneration are discussed. 相似文献
95.
96.
Pulsed laser deposition of hard coatings in atmospheric air 总被引:1,自引:0,他引:1
V.I. Konov T.V. Kononenko E.N. Loubnin F. Dausinger D. Breitling 《Applied Physics A: Materials Science & Processing》2004,79(4-6):931-936
A new laser plasma technique for non-vacuum deposition of thin films has been proposed and experimentally realized. It is based on the fact that the plasma plume, which occurs under ablation of a target in air by high-intensity short laser pulses, can penetrate through a dense gas environment without significant cooling at the distance of about 1 mm. The technique has been applied to deposit diamond-like carbon (DLC) coatings on stainless steel substrates using four different values of pulse duration: 10 ns, 300 ps, 5 ps and 130 fs. Optimization of different experimental parameters including distance between the target and the substrate, laser intensity and gases (He, Ar, N2, compressed air) blown in the deposition zone, has been performed. The deposition rate in the experiments was estimated as 2–5×10-4 nm/(cm2pulse) for the pulse energy of 1–4 mJ. The deposited amorphous carbon films with thickness of several hundred nanometers have shown high average nanohardness (10–25 GPa depending on the irradiation conditions) and good adhesion to substrates (60 MPa). According to X-ray electron spectroscopy analysis the films consist of both sp2- and sp3-bonded carbon and contain 3–7% of free oxygen in bulk. The mechanisms of DLC non-vacuum laser deposition are discussed. To demonstrate the large potential of this technique, the first results on deposition of titanium nitride using ablation of titanium in air with nitrogen jet assistance are also presented. PACS 52.38.Mf; 81.15.Fg; 81.05.Uw 相似文献
97.
H. Müller N. I. Chapliev V. I. Konov S. M. Pimenov A. M. Prokhorov 《Applied Physics A: Materials Science & Processing》1990,50(3):343-348
The thresholds of charged particle emission, photon emission and plasma formation induced by CO2 laser pulsed irradiation of WC-Co hardmetals were determined. The influence of the surface roughness and chemical composition on the thresholds and on the mechanism of the plasma formation was considered. The first experimental data were obtained which indicate the possible realization of the emissive mechanism of air optical breakdown in the vicinity of the solid surface. 相似文献
98.
L. A. Apresyan D. V. Vlasov T. V. Vlasova V. I. Konov G. A. Krikunov A. A. Klimanov 《Technical Physics》2006,51(9):1247-1249
A reactor for synthesis of carbon nanostructures with hydrogen activated during diffusion through an incandescent metallic partition is proposed and implemented. Multiwall carbon nanotubes and nanorods synthesized in this reactor are described. 相似文献
99.
100.
T.?V.?KononenkoEmail author P.?Alloncle V.?I.?Konov M.?Sentis 《Applied Physics A: Materials Science & Processing》2011,102(1):49-54
A time-resolved shadowgraphic technique was used to investigate local transfer of diamond nanopowder from a thin titanium
film on a silica support under irradiation by 450-fs or 50-ps laser pulses. Clean powder ejection driven by blistering of
the metal film remaining on the target surface was found possible in a limited fluence range, but the metal film was removed
from the target together with the powder when higher laser fluences were applied. The velocity of the powder ejection demonstrates
an approximately linear rise in a wide range of the incident fluences, while the slope of the velocity curve decreases for
thicker metal layers. The maximum ejection velocity achievable in the blistering regime was evaluated as ∼100 m/s independently
of the metal thickness and pulse width. 相似文献