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1.
To refine the structure of radiation-induced defects, a comparison is made of the EPR spectra of LiF and NaF crystals with
various constituent impurities γ-irradiated with different doses, as well as the experimentally measured and calculated intensity
distributions of HFS lines in the EPR spectra of these crystals. It is shown that the F-centers, whose model represents an
ionized quasimolecule consisting of two metal atoms on each side of a halide vacancy, are responsible for the broad band observed
independently of the impurity composition of the crystals and irradiation dose, while the HFS is caused by defects based on
interstitial halide atoms.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 3, pp. 455–459, May–June, 1998. 相似文献
2.
A. D. Zamkovets M. P. Zakharich V. P. Komar I. V. Skornyakov 《Journal of Applied Spectroscopy》1998,65(5):766-777
Results of investigations on designing band dispersion and dispersion-interference filters for the 4–30 μm IR range and cutoff
filters for the 50–300 μm region are presented. Analyzers of the composition of a substance that are designed on the basis
of band IR filters and analysis procedures are described.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 5, pp. 734–744, September–October, 1998. 相似文献
3.
V. S. Pavlovich 《Journal of Applied Spectroscopy》1997,64(2):220-228
The paper sets out a statistical theory of the effect exerted by interactions of constant dipoles in solutions on the fluorescence
spectra of polar compounds. The theory is based on the concept of band structure of the electronic levels of a polar impurity
(dissolved) molecule in polar media.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 2, pp. 209–216, March–April, 1997. 相似文献
4.
A. G. Shvedko V. V. Ermolenkov S. G. Kruglik V. A. Orlovich 《Journal of Applied Spectroscopy》1999,66(5):841-850
A resonance-Raman-scattering multifrequency laser spectrometer operating in a wide spectral range (355–750 nm) and making
possible the recording of both stationary Raman spectra and spectra with a time resolution of up to 100 psec in the time interval
of 0–50 nsec has been developed. The spectrometer has been used with advantage for the study of the excited states of molecules
of metalloporphyrins in solutions and processes of interaction of model metalloporphyrins with DNA and DNA-modeling polynucleotides.
To whom correspondence should be addressed.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus 68, F. Skorina Ave., Minsk, 210072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 5, pp. 726–733, September–October, 1999. 相似文献
5.
Shuaibov A. K. Gomoki Z. T. Kalyuzhnaya A. G. Shchedrin A. I. 《Technical Physics》2011,56(8):1213-1215
The influence of the iodine vapor pressure on the output characteristics of a UV lamp pumped by a longitudinal glow discharge
is studied. The lamp is filled with a helium-iodine mixture to a pressure of 100–1500 Pa. In the spectral range 320–360 nm,
the I2(D′ → A′) band with a peak at 342 nm prevails, while in the bactericidal range, iodine atomic lines at 183.0 and 206.2 nm dominate.
The power of the UV lamp is optimized according to the iodine vapor pressure and working mixture composition by numerical
simulation. 相似文献
6.
A. N. Malyshko A. M. Chaplanov E. N. Shcherbakova 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2011,5(5):996-1000
The elemental composition and features of structural and phase transformations in the Si-Fe-Si thin-film system (50–30–50
nm) upon steady-state annealing are studied as functions of the temperature and treatment time by energy-dispersive microanalysis
and electron diffraction methods. Optimum annealing parameters for the formation of iron silicide FeSi and disilicide β-FeSi2 are determined. 相似文献
7.
F. P. Korshunov T. P. Larionova A. V. Mudryi A. I. Patuk I. A. Shakin 《Journal of Applied Spectroscopy》1999,66(3):410-414
Using low-temperature (4.2–78 K) photoluminescence, we study the processes of defect formation in silicon films on sapphire
irradiated with high-energy particles (electrons, γ-quanta of60Co). It is established that carbon atoms, as a residual process impurity, participate in the formation of luminescence centers
stable up to annealing temperatures of about 550 K. For carbon-containing centers we reveal a shift in the spectral lines
relative to their position in spectra of single-crystal silicon. It is proposed that this spectral shift is associated with
the presence of internal stresses of about 5·108 N/m2 in the silicon films.
Institute of Solid-State Physics and Semiconductors, National Academy of Sciences of Belarus, 17, P. Brovka Str., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskefii, Vol. 66, No. 3, pp. 383–386, May–June, 1999. 相似文献
8.
A. I. Nepomnyashchikh A. A. Shalaev A. K. Subanakov A. S. Paklin N. S. Bobina A. S. Myasnikova R. Yu. Shendrik 《Optics and Spectroscopy》2011,111(3):411-414
LiF single crystals with copper impurity (0.0004–0.002%) have been grown by the Czochralski method and investigated. The luminescence,
excitation, and optical absorption spectra have been recorded. The luminescence spectrum contains a band at 450 nm upon 250-nm
excitation. This band is attributed to Cu+ centers in the samples grown. The mechanisms of capture and recombination during thermoluminescence are considered. 相似文献
9.
An investigation is made of the dosimetric properties of proposed spin-resonance γ-radiation dose meters based on Ba and Sr
dithionates. Their operating range (0.1 Gy−50 kGy for Ba dithionate and 0.2 Gy−80 kGy for Sr dithionate) is established. Their
advantages over the EPR/L-α dose meter are discussed: the narrow isotropic EPR signal, higher radiation sensitivity, large
range of linear response. Conditions of storage and use of dithionate-based dose meters (temperature of 15–25°C, relative
air humidity no more than 80%) are determined.
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus, 13, Surganov St., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 3, pp. 372–376, May–June, 1998. 相似文献
10.
N. I. Mukhurov S. P. Zhvavyi S. N. Terekhov A. Yu. Panarin I. F. Kotova P. P. Pershukevich I. A. Khodasevich I. V. Gasenkova V. A. Orlovich 《Journal of Applied Spectroscopy》2008,75(2):214-218
Luminescent properties of anodic alumina fabricated in anodizing solutions containing oxalic, sulfuric, and phosphoric acids
in addition to those modified by thermal annealing are investigated. Comparison of the obtained data shows that F+-centers are responsible for the luminescence band at 390 nm. The intense photoluminescence band of porous anodic alumina
substrates at 450–500 nm is associated with oxalate anions.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 2, pp. 208–212, March–April, 2008. 相似文献
11.
G. A. Zalessakaya D. L. Yakovlev D. I. Baranovskii E. G. Sambor 《Journal of Applied Spectroscopy》1998,65(3):351-356
Collisional losses of vibrational energy in mixtures of benzophenone excited by nitrogen laser radiation (λ=337 nm) and foreign
gases (Ar, Kr, SF6, C5H12) were studied by time-resolved delayed luminescence. It is established that the intensities and rates of decay of the fast
and slow components of delayed luminescence can be used to evaluate the characteristics of V–V– and V–T–transfer of vibrational
energy. For the V-V-process, the efficiencies and mean energies transferred in a collision are determined. It is shown that
in the mixture with multiatomic gases, vibrational equilibrium is reached after a few collisions, the number of which decreases
as the molecule of the foreign gas becomes more complicated. The V–V–process is characterized by high efficiencies of collisions
typical for “supercollisions”. The experimental characteristics of V-V-transfer correlate well with ergodic transfer of vibrational
energy predicted by statistical theories. 0120 0126 V 3
Institute of Molecular and Atomic Physics of the National Academy of Science of Belarus, 70, F. Skorina Ave., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 3, pp. 340–345, May–June, 1998. 相似文献
12.
O. S. Ivanova É. A. Petrakovskaya R. D. Ivantsov I. S. Édel’man S. A. Stepanov T. V. Zarubina 《Journal of Applied Spectroscopy》2006,73(3):400-405
We have studied the magneto-optic Faraday effect (FE) and electron paramagnetic resonance (EPR) in an aluminum potassium borate
glass containing Fe oxides as an impurity in a concentration of 1.5 mass % and Mn impurity in variable concentration from
0 to 1.2 mass %. When manganese oxide is added to the glass composition, the paramagnetic contribution to the Faraday effect
increases more slowly than the change in the total concentration of paramagnetic ions, which allows us to hypothesize the
appearance of clusters in which the paramagnetic ions are coupled by antiferromagnetic interactions. Formation of clusters
upon addition of manganese oxide is confirmed by the change in the nature of the EPR spectra, where we observe a manganese
concentration dependence of the distribution of iron atoms with respect to the different positions in the glass matrix. Heat
treatment leads to a strong increase in the Faraday effect and a change in the spectral dependences of the Faraday effect
and the EPR, which is explained by enlargement of the clusters and appearance of nanoparticles.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 3, pp. 354–358, May–June, 2006. 相似文献
13.
S. N. Terekhov L. A. Meleshchenko A. M. Shulga V. S. Chirvonyi 《Journal of Applied Spectroscopy》1997,64(6):726-733
It is found that in absorption spectra of porphyrin dimers linked by a flexible bridge, the shape of the Soret band strongly
depends on the solvent, which is explained by differences in the conformation composition of the dimers studied. The conformation
composition was analyzed with the deconvolution method, which made it possible to resolve and sharpen all components of the
complex contour, of the Soret band. Using different solvents, we studied changes in the behavior of every elementary band
with a model of exciton (dipole-dipole) interaction and found that in all the solutions this dimer occurred in the form of
face-to-face and side-to-side conformers. The relative content of face-to-face conformation markedly increased with the polarity
of the solvent.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 6, pp. 716–723, November–December, 1997. 相似文献
14.
Strong absorption bands at 280, 385, and 640 nm; a pulsed cathodoluminescence band with peaks at 325 and 520 nm and a dip at 385 nm; and a structured luminescence band in the range of 591–711 nm composed of four pair lines and having a dip near 640 nm have been observed in the spectra of yttrium-aluminum garnet ceramics activated with ytterbium (10 mol %) and subjected to vacuum sintering at a temperature of 1800°C. It is shown that these spectral features are absorption and luminescence bands of divalent ytterbium ions with the 4f 136s electron configuration of the ground state. These ions occupy the cubic site that is formed under conditions of oxygen deficit and disappears when the latter is removed during annealing ceramics in air. 相似文献
15.
A. V. Kukhto 《Journal of Applied Spectroscopy》1998,65(5):722-738
Pesults of investigation of the luminescence of complex organic compounds upon excitation with electrons of various energies
are reported. Data on spectra of energy losses of electrons, fluorescence excitation cross sections and functions, fluorescence
emission spectra, fluorescence kinetics, polarization, and energy yield, effects of impurity gases, and theoretical analysis
of the processes taking place in the system are presented. Results of investigation of the luminescence of complex molecules
in electric discharges (dc, pulsed, high-frequency, non-self-maintained, and plasma-beam) and in a condensed state (solutions,
molecular crystals, and thin solid films) are discussed.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk 220072, Belarus.
Transtated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 5, pp. 694–708, September–October, 1998. 相似文献
16.
T. K. Solovykh 《Journal of Applied Spectroscopy》1997,64(5):654-657
The role of impurity ions in formation of the optical properties of rare-earth orthoferrites is investigated. Optical spectra
of the substituted against unsubstituted orthoferrites are presented. The influence of different isovalent substitutions on
the optical absorption of orthoferrites that are promising for magnetooptics is studied.
Institute of Solid-State and Semiconductor Physics of the Academy of Sciences of Belarus, 17, P. Brovka St., Minsk, 220072,
Belarus. Translated from zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 5, pp. 642–645, September–October, 1997. 相似文献
17.
Many studies have been done on low energy (1–200 keV) and high dose (1016–1017) implantation of Mn in GaAs. This study is an attempt to incorporate Mn ions in GaAs through implantation of 1 MeV Mn+1 ions in semi-insulating GaAs substrates at doses of 3×1015/cm2 and subsequent annealing. This was done to find out if any alloy of Mn–Ga–As, or binary compounds of Mn–Ga or Mn–As form
due to annealing of Mn+1 ions implanted in GaAs substrates. High Resolution XRD (HRXRD) performed before annealing shows a possibility of Ga–Mn–As
alloy formation, and after annealing at 800°C, except for GaAs main peaks no other phase peaks were detected. Scanning electron
microscopy (SEM) shows nanostructures of various dimensions which are thought to be formed due to the defects generated due
to implantation. Fourier Transform Infrared (FTIR) study shows the shift in bandgap due to Mn doping. Raman spectroscopy shows
the red shift in LO and TO peak positions of GaAs after annealing, which indicates the presence of disorder and damage due
to implantation. Resistivity measurement shows a thermally activated semiconductor character of charge conduction with an
activation energy of 51 meV and this activation may have occurred through the transitions from impurity band to valence band.
Large positive (∼25%) magnetoresistance and a mixture of ferromagnetic and paramagnetic behavior obtained in the magnetization
measurement indicate the presence of ferromagnetic MnAs nanoclusters embedded in paramagnetic GaAs:Mn matrix. 相似文献
18.
Barium fluoride (111) cleaved surfaces have been used with the hot-wall method to grow epitaxial Pb1−xSnxTe films from source materials either undoped or doped with 0.1, 0.5, or 1 at. % cadmium and having x=0.2. The absorption
in the wavelength range 2–13 μm has been measured together with the spectral dependence of the photoluminescence. The cadmium
affects the optical width of the forbidden band and the high-frequency dielectric constant, as well as the photoluminescence
intensity. The optical absorption spectra of the doped epitaxial films contain additional absorption bands due to the impurity
level in the forbidden band. The position of the impurity level has been determined and the shift in it relative to the bottom
of the conduction band as the temperature is reduced.
Materials Science Institute, National Academy of Sciences of Ukraine. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii,
Fizika, No. 5, pp. 8–11, May, 1996. 相似文献
19.
A nonlinear device based on nonlinear total internal reflection is suggested which provides a more than ten-fold shortening
of the laser pulse and smooth variation of the pulse duration due to double reflection from the interface between transparent
and absorbing media. Results are presented for the shape and duration of the pulse components that have been reflected and
transmitted by the interface.
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., 220072, Minsk, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 3, pp. 325–328, May–June, 1997. 相似文献
20.
Cadmium sulfide (CdS) nanostructured materials were synthesized by a wet chemical route without using any capping agent. X-ray diffraction pattern showed the typical interplanar spacings corresponding to the cubic phase of CdS. Transmission electron microscopy studies showed the nanowires formation with length in the range 0.1–1.5 μm and the diameter 25–30 nm. UV–visible optical spectroscopy study was carried out to determine the bandgap of the nanostructured CdS thin films and it showed blue shift with respect to the bulk value. Variation of band gap energies with annealing temperature was also studied in detail. Room temperature photoluminescence of the nano-CdS films was measured and the spectrum showed a broad band centered at ~567 nm, which originated from trap states existing in the forbidden energy gap. 相似文献