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21.
W. Fuß J. Göthel K. L. Kompa M. Ivanenko W. E. Schmid 《Applied physics. B, Lasers and optics》1992,55(1):65-70
A low-pressure (20 mbar) CO2 laser allows to extract pulses at several selected wavelengths simultaneously from the same active medium. We demonstrated this, using an industrial laser modified by a Q-switch and a resonator with two branches. In one branch the wavelengths are spatially separated, whereas in the other they oscillate in one common transverse mode. We designed a multi-wavelength resonator which requires a single additional reflector compared to usual laser cavities. It provided tunable oscillation at six wavelength simultaneously. 相似文献
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A model for explaining incommensurate spin modulation observed in La2?xSrxCuO4 is proposed without assuming stripe formation. In this model, all features of the observed spin textures in the entire doping range are associated only with the geometrical relations for the square lattice and with the competition between various forms of ordering of Sr ions. 相似文献
25.
The mechanism of hole carrier generation is considered in the framework of a model assuming the formation of negative U centers (NUCs) in HTSC materials under doping. The calculated dependences of carrier concentration on the doping level and temperature are in quantitative agreement with experiment. An explanation is proposed for the pseudogap and 60 K phases in YBa2Cu3O6+δ. It is assumed that a pseudogap is of superconducting origin and arises at temperature T* > Tc∞ > Tc in small nonpercolating clusters as a result of strong fluctuations in the occupancy of NUCs (Tc∞ and Tc are the superconducting transition temperatures of an infinitely large and finite NUC clusters, respectively). The T*(δ) and Tc(δ) dependences calculated for YBa2Cu3O6+δ correlate with experimental dependences. In accordance with the model, the region between T*(δ) and Tc(δ) is the range of fluctuations in which finite nonpercolation clusters fluctuate between the superconducting and normal states due to NUC occupancy fluctuations. 相似文献
26.
V. V. Ivanenko Yu. G. Voloshina M. V. Okhrimenko L. K. Patrilyak K. I. Patrilyak 《Theoretical and Experimental Chemistry》2009,45(3):198-202
Along with oxidation of hydrogen-containing coke structures, we have observed oxidation of compact accumulations of hydrogen-free
coke and as a result we can quantitatively differentiate between outer-surface and intraporous burned coke, and the intraporous
coke in turn can be quantitatively distributed over the different elements of the zeolite structures.
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 45, No. 3, pp. 185–189, May–June, 2009. 相似文献
27.
Igor V. Zatovsky Nikolay S. Slobodyanik V. I. Ivanenko Yu. S. Oseledchik V. Yu. Letsenko Tetiana I. Ushchapivska 《Crystal Research and Technology》2016,51(2):178-182
Solid solutions KTi1‐XHfXOPO4 (х = 0.008 – 0.107) possessing the KTiOPO4 structure, have been synthesized in molten system K2O‐P2O5‐TiO2‐HfF4. The crystal growth experiment of Hf‐doped KTP crystal has been reported. The X‐ray powder diffraction data and chemical analysis are also presented. It has been shown that KTiOPO4 crystal structure slightly changes when Hf incorporates into the framework. Transmission/absorption spectra of KTi0.974Hf0.026OPO4 crystals have been recorded. The incorporation of Hf ions shifts the optical absorption edge in the UV‐visible spectrum towards the long‐wavelength region with absorption near 387 nm. 相似文献
28.
J. Göthel M. Ivanenko P. Hering W. Fuß K. L. Kompa 《Applied physics. B, Lasers and optics》1996,62(4):329-332
The isotope-selective multiphoton dissociation of CHClF2 in a multipass refocusing Herriott cell was used to enrich more than 4 moles of chlorodifluoromethane to 99.99% of12C isotopic purity. It is the largest isotope quantity ever separated by a laser process. A cw excited mechanically Q-switched CO2 laser, which delivers 16 mJ pulses at 5 kHz was used. The enrichment controlled by a mass-spectrometer and guided by a PC was run with a rate of 25 g12C per 24 h. 相似文献
29.
Sharutin V. V. Egorova I. V. Ivanenko T. K. Pavlushkina I. I. 《Russian Journal of General Chemistry》2002,72(12):1952-1952
Russian Journal of General Chemistry - 相似文献
30.
Sharutin V. V. Egorova I. V. Ivanenko T. K. Sharutina O. K. Gerasimenko A. V. 《Russian Journal of Coordination Chemistry》2003,29(4):297-299
Adduct of triphenylphosphine oxide and sulfuric acid was synthesized by reacting arenesulfonic acids with triphenylphosphine oxide (1 : 2) in the presence of the moisture of air. According to the X-ray diffraction data, the phosphorous atom has a distorted tetrahedral coordination. The sulfuric acid molecule is disordered over two sites and is linked with two triphenylphosphine oxide molecules through hydrogen bonds. 相似文献