共查询到20条相似文献,搜索用时 265 毫秒
1.
V. S. Burakov A. F. Bokhonov P. A. Naumenkov M. I. Nedel’ko N. V. Tarasenko 《Journal of Applied Spectroscopy》1998,65(3):442-448
From the analysis of the contours of the spectral lines of target-material atoms, the electron and atomic concentrations and
their variation with time are determined in the laser plasma of a combined Cu–Al–Cu target. The time dependences for the concentrations
of electrons and atoms in the ground and excited states are explained within the framework of a model that allows for plasma
decay being determined by processes of three-particle recombination and ionization as well as by the variation in the particle
concentration in plasma expansion.
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. 3, pp. 426–432, May–June, 1998. 相似文献
2.
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
3.
For the first time, the dissipation of laser-radiation energy in the gas surrounding a target is investigated under the conditions
of intense plasma formation near a surface and the existence of large spots of: irradiation. The parameters of different regions
of the heated gas are measured and an energy balance of the process of laser effects is obtained.
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. 6, pp. 814–817, November–December, 1998. 相似文献
4.
An analysis of1H NMR spectra of reduced Ni-octaethylporphin (NiOEP)n− n=2,3) complexes has allowed the conclusion that the first and third excess electrons are localized on orbitals of the porphyrin
ligand, while the first excess electron is on the dx
2-y2-orbital of Ni. This is a basis for thinking that in the course of NiOEP reduction the energy of the lowest unoccupied molecular
orbital of the ligand becomes smaller than that of the dx
2-y2-orbital of nickel.
Institute of Molecular and Atomic Physics of the Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 4, pp. 513–517, July–August, 1997. 相似文献
5.
P. A. Apanasevich D. E. Gakhovich A. S. Grabchikov V. A. Orlovich 《Journal of Applied Spectroscopy》1997,64(4):461-469
Results of an experimental study of optical feedback as a method to suppress quantum-noise-induced macroscopic fluctuations
in the emission of stimulated RS are reported. Statistic changes in the energy of Stokes pulses in the linear mode of scattering
and those in the amplitudes of solition-like pulses in the nonlinear mode are shown. A decrease in the normal standard deviation
of fluctuations is attained for both modes.
B. I. Stepanov Institute of Physics of the Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 4, pp. 450–457, July–August, 1997. 相似文献
6.
S. L. Bondarev 《Journal of Applied Spectroscopy》1997,64(1):1-15
A review of data on the photophysics of carotenoids is presented. Results of investigations of spectroscopic, temporal, and
energy parameters of excited S1 and S2 singlet states of β-carotene and related compounds are critically examined. These states give rise to extremely high probabilities
(1011–1013 sec−1) of radiationless deactivation of the electronic excitation energy in carotenoids. Results of investigations of photophysical
properties of triplet states of carotenoids are considered mainly from the standpoint of quenching of singlet oxygen and triplet
states of organic molecules by carotenoids.
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. 1, pp. 5–19, January–February, 1997. 相似文献
7.
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
8.
The problem of reflection and refraction of a conical beam at the boundary of an object of cylindrical shape is solved analytically.
The amplitude and energy coefficients of reflection for a field of variable polarization are calculated. The light energy
absorption in a cylindrical object and its distribution over the cross section are investigated. The advantage of using conical
beams of light for probing cylindrically shaped objects, including biological ones, is shown.
Presented at the 5th International Scientific-Technical Conference “Quantum Electronics,” November 22–25, 2004, Minsk, Belarus.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 5, pp. 664–669, September–October, 2005. 相似文献
9.
The authors consider the dependence of hydrogen plasma radiation on the nonideality parameter near the thresholds of spectral
series. At low electron concentrations experimental data agree well with calculations based on the principle of spectroscopic
stability. At higher electron concentrations the experimental data agree better with calculations that include a decrease
in the thresholds of photorecombination in the statistical plasma microfield and a change in the statistical weight of the
levels which is induced by their autoionization in the plasma microfield.
A. V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, 15, P. Brovka St., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp. 22–26, January–February, 1998. 相似文献
10.
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
11.
S. A. Bagnich 《Journal of Applied Spectroscopy》1998,65(5):687-700
Results of investigations of all types of long-lived luminescence of organic molecules in the gas phase and condensed media
are presented. Methods for identification and separation of contributions of phosphorescence and thermally activated fluorescence
in long-lived luminescence of organic-molecule vapors are proposed. Energy transfer and migration processes in the case of
the inductive-resonant mechanism of intermolecular interaction leading to the appearance of sensitized phosphorescence and
annihilation-induced delayed fluorescence are considered. Experimental results on energy migration obtained for solid solutions
of organic compounds are analyzed within the framework of the concepts of percolation theory with account for the microscopic
inhomogeneity of the systems under investigation and the fractal properties of the clusters of activator molecules.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, F. Skorina Ave., 70, Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 5, pp. 662–674, September–October, 1998. 相似文献
12.
I. V. Kozlov V. B. Odzhaev V. N. Popok I. I. Azarko E. I. Kozlova 《Journal of Applied Spectroscopy》1998,65(4):583-588
Films of polyethylene, polyethylene terephthalate, and polyamine-6 implanted with B+ and N+ ions with an energy of 100 keV are investigated by an EPR method in a dose interval of 1·1014–1·1017 cm−2. It is shown that paramagnetic centers with g=2.0025 formed in the implanted polymers have a nature similar to the nature
of paramagnetic centers of pyrolized and initially conducting polymers. Correspondence of the character of the variation in
paramagnetic characteristics of the modified polymers to the model proposed earlier for the formation of pyrocarbon “drops”
in ion implantation is revealed. The relaxation times for paramagnetic centers in the implanted polymer films are calculated
and assumptions are made about the formation of a quasi-two-dimensional electron gas as well as the possibility of magnetic
ordering in polymer-film layers modified by high-dosage implantation. The effect of oxygen on the electron states of the implanted
polymer specimens is studied.
Belarusian State University, 4, Skorina Ave., Minsk, 220050 Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol.
65, No. 4, pp. 562–567, July–August, 1998. 相似文献
13.
E. K. Naumenko 《Journal of Applied Spectroscopy》1998,65(3):434-441
The spectral dependences of the optical characteristics governing radiation transfer in scattering media are analyzed within
the wavelength range of 0.4–14 μm for three types of aerosols. The wavelength ranges where approximate methods of calculation
of frequency-contrast characteristics are applicable are established; the corresponding limitting masses of aerosol particles
in a layer per unit of surface area are determined for which approximate methods provide acceptable accuracy.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 3, pp. 419–425 May–June, 1998. 相似文献
14.
V. A. Tolkachev 《Journal of Applied Spectroscopy》1998,65(5):643-658
A number of phenomena that determine the nature of the fluorescence of free complex molecules and the possibility of its analytical
application are considered. Attention is specially paid to the specific features of the energetics of radiationless transitions,
the role of statistical factors in the formation of spectral properties and the interrelationship among the luminescence-spectrum
characteristics of rarefied vapors of complicated molecules, and the processes of energy transfer in collisions. The properties
of polarized fluorescence of hot and jet-cooled vapors, the processes of relaxation of anisotropy in time and during collision
reorientation, and transfer of anisotropy in photodisintegration are analyzed.
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. 620–634, September–October, 1998. 相似文献
15.
V. S. Pavlovich 《Journal of Applied Spectroscopy》1997,64(6):764-777
Polar luminescence probe+polar medium subsystems are considered. True minimization parameters of the free energy F are obtained.
It is shown that Franck-Condon transitions between F-terms of different electronic states are generally not “vertical”. A
complete thermodynamic classification of photoinduced processes of orientational relaxation in the excited S1 and ground S0 states is presented. Depending on the excitation conditions they can be either exo- or endothermic, spontaneous or induced
(not spontaneous), and accompanied by an increase or decrease in entropy. Indifferent processes also take place. Regularities
of shifts of fluorescence spectral bands and burned holes in time-resolved experiments are discussed.
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. 753–765, November–December, 1997. 相似文献
16.
Institute of Molecular and Atomic Physics Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 128–136, March–April, 1995. 相似文献
17.
A. P. Losev I. N. Nichiporovich S. M. Bachilo G. D. Egorova D. I. Volkovich K. N. Solov'yo 《Journal of Applied Spectroscopy》1995,62(2):311-320
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, Minsk, 220072, 70, F. Skorina Ave., Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 152–163, March–April, 1995. 相似文献
18.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 145–150, March–April, 1995. 相似文献
19.
I. V. Filatov I. V. Avilov É. I. Zen'kevich A. M. Shul'ga 《Journal of Applied Spectroscopy》1999,66(4):593-596
On the basis of quantum-chemical calculations of the properties of excited states and comparison with the experimental data,
we show that at room temperature unliganded dimers of Zn-porphyrins and Zn-chlorins, bonded through a CH2−CH2-group, are in a conformation close to an eclipsed one, while their dipyridine complexes are in an unchanged conformation.
For triad and pentad complexes, formed as a result of extraliganding of dimers of Zn-porphyrins with di- and tetrapyridyl-substituted
free bases of porphyrins, the calculations predict the presence of states with transfer of a charge from dimers onto a free
porphyrin base that are manifested in the region between the Q- and B-transitions in electron absorption spectra.
To whom correspondence should be addressed.
Reported at the VIIIth International Conference on Spectroscopy of Porphyrins and Their Analogs, Minsk, September 22–26, 1998.
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. 66, No. 4, pp. 535–537, July–August, 1999. 相似文献
20.
A. I. Trokhimets 《Journal of Applied Spectroscopy》1995,62(1):88-90
Institute of Physicoorganic Chemistry, Academy of Sciences of Belarus, 220603, Minsk, Ul. Surganova, 13, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 1, pp. 104–107, January–February, 1995. 相似文献