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排序方式: 共有90条查询结果,搜索用时 15 毫秒
1.
P. V. Ivannikov N. S. Chekalin P. A. Miroshnikov G. V. Saparin A. A. Altukhov A. V. Shustrov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(4):386-393
Surfaces of natural type-IIa diamond plates used in ionizing-radiation detectors are studied in a scanning electron microscope using techniques of electron-beam-induced conductivity at different bias voltages and real-color cathodoluminescence. 相似文献
2.
Alexander Marunkov Nikolai Chekalin Jonas Enger Ove Axner 《Spectrochimica Acta Part B: Atomic Spectroscopy》1994,49(12-14)
A laser-induced fluorescence in graphite furnace (LIF-GF) set-up has been equipped with an intensified CCD detector (ICCD) that enables simultaneous multichannel detection of large wavelength regions. The main advantages of such a system in comparison with conventional photomultiplier detection are: simultaneous detection of several fluorescence wavelengths for easy characterization of excitation and fluorescence spectra and for an increase of the absolute sensitivity and spectral selectivity; simultaneous monitoring of background signals, such as those due to matrix interferences, blackbody radiation and scattered laser light; decrease of the susceptibility to radio-frequency pick-ups emitted from the pump laser due to the delayed read-out procedure; time-resolved studies of fluorescence spectra for improved elemental selectivity or for studies of atomization processes, and a possibility to perform two-dimensional imaging of height distributions of atomization and, in combination with an imaging spectrometer, diffusion processes in the furnace. The first work on LIF-GF with ICCD detection has been performed on Ni. The most sensitive and versatile excitation and detection wavelengths have been identified. Detection limits in water solutions by the LIF-GF technique have been improved by two orders of magnitude and are found to be 0.015 pg with ICCD and 0.01 pg using a photomultiplier at the most sensitive excitation and detection wavelengths. Nickel in
concentrations has been detected in aqueous standard reference samples with sodium concentrations ranging from
to % (riverine water and estuarine water) with good accuracy and precision. The Ni contents of standard riverine and estuarine water were determined to 1.00 ± 0.11 and 0.75 ± 0.07 ng/ml, respectively. The certified concentrations are 1.03 ± 0.10 and 0.743 ± 0.078
. 相似文献
3.
JETP Letters - The formation and self-recovery of a single-cycle light bullet after total internal reflection of a femtosecond pulse in a transparent insulator in the region of anomalous dispersion... 相似文献
4.
I. P. Pozdnyakov F. Wu A. A. Melnikov V. P. Grivin N. M. Bazhin S. V. Chekalin V. F. Plyusnin 《Russian Chemical Bulletin》2013,62(7):1579-1585
Photochemistry of a 1: 1 FeIII-lactic acid complex, [Fe(Lact)]+, in aqueous solutions was studied by stationary photolysis, nanosecond laser flash photolysis (355 nm, 6 ns), and femtosecond pump-probe spectroscopy (400 nm, 200 fs). The quantum yield of photolysis of [Fe(Lact)]+ upon excitation at 355 nm is 0.4 and 0.22 in the deoxygenated and air-saturated solutions, respectively. Weak transient absorption in the range 500–750 nm was observed in the nanosecond experiments. It was assigned to a [FeII...-O-CH(Me)-COO·]+ radical complex. The spectral properties of the ligand-to-metal charge transfer excited state and the characteristic time of formation of the radical complex (1.5 ps) were determined in the femtosecond spectroscopy experiments. A reaction mechanism was proposed, which involves inner-sphere electron transfer in the excited complex with the formation of a radical complex [FeII...-O-CH(Me)-COO·]+ and its subsequent transformation to the end product of the photochemical reaction. 相似文献
5.
S. A. Aseev B. N. Mironov V. G. Minogin S. V. Chekalin 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(7):931-933
A combination of femtosecond laser techniques and nanomicroscopy creates promising new possibilities for studying both matter
and a whole number of ultrafast physical processes. The results obtained at the Institute for Spectroscopy as a result of
developing a new area of femtosecond nanomicroscopy are presented. 相似文献
6.
Nanolocalized ion packets have been produced due to the transmission of photoions, which are emitted from a refractory metal emitter irradiated by femtosecond laser radiation with a high repetition rate, through a quartz nanocapillary. With the use of such a pulsed nanobeam, a miniature ion microscope has been created and the image of a dielectric-nanoaperture fragment has been obtained. 相似文献
7.
B. N. Mironov S. A. Aseev V. S. Makin S. V. Chekalin V. S. Letokhov 《JETP Letters》2008,88(4):261-263
Extended periodic microstructures are formed on a thin gold film by femtosecond laser radiation. The structure length is an order of magnitude larger than the typical size of the irradiated region. The detection of gold photoions generated in the process of the microstructuring ensures a high-sensitivity on-line diagnostics of this phenomenon. 相似文献
8.
V. M. Apatin V. O. Kompanets V. N. Lokhman N. -D. D. Ogurok D. G. Poydashev E. A. Ryabov S. V. Chekalin 《JETP Letters》2011,94(7):570-573
Intracluster reactions that are induced in (CF3I)
n
clusters by femtosecond ultraviolet radiation, including the reaction of the formation of the I2+ molecular ion, have been directly observed. It has been shown that there are two channels of the formation of I2+ ions with the characteristic times τ1 ≈ 1 ps and τ2 ≈ 7 ps. A model of these reactions has been proposed that is in good agreement with the experimental data. 相似文献
9.
E. M. Glebov I. P. Pozdnyakov V. P. Chernetsov V. P. Grivin A. B. Venediktov A. A. Melnikov S. V. Chekalin V. F. Plyusnin 《Russian Chemical Bulletin》2017,66(3):418-425
Photosolvation of a PtIV hexathiocyanate complex Pt(SCN)6 2– in water and ethanol was studied by steady-state photolysis, nanosecond laser flash photolysis, and ultrafast kinetic spectroscopy. Complexes Pt(SCN)5(H2O)– and Pt(SCN)5(C2H5OH)– were found to be the only reaction products. The quantum yields of photosolvation are independent of the excitation wavelength, being equal to 0.25 and 0.5 for the solutions of the complex in water and ethanol, respectively. Photosolvation proceeds by the mechanism of heterolytic metal—ligand bond dissociation without involvement of redox processes. The characteristic time of formation of the end products for both solvents is about 10 ps. Three successive intermediates detected on the picosecond time scale were interpreted as PtIV complexes. The nature of the intermediates and possible mechanisms of photosolvation are discussed. 相似文献
10.
D. A. Dement’ev A. L. Ivanov O. B. Serov A. G. Stepanov S. V. Chekalin A. M. Smolovich 《JETP Letters》1997,65(5):402-404
Wave-front reconstruction by geometric-optical reflection of the reconstructing radiation from interference surfaces of a
structure recorded in the bulk of a medium by counterpropagating laser pulses is observed. The recording is done with the
aid of a sapphire titanate laser. Pulse durations of 30–40 fs are used.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 5, 388–390 (10 March 1997) 相似文献