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1.
T. F. Raichenok 《Journal of Applied Spectroscopy》1999,66(3):470-472
An investigation is made of the absorption, fluorescence, and fluorescence excitation spectra of human blood serum whole and
diluted with a sodium-phosphate buffer solution. Time characteristics of the longwave serum luminescence are obtained. The
quantum yield of background fluorescence upon excitation by radiation with λexc=500 is found to be 0.5%.
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 3, pp. 433–436, May–June, 1999. 相似文献
2.
V. M. Mazhul L. S. Ivashkevich D. G. Shcherbin N. A. Pavlovskaya G. V. Naumova T. F. Ovchinnikova 《Journal of Applied Spectroscopy》1997,64(4):503-508
A detailed analysis of luminescence properties of humic substances and fulvic acids extracted from peat soil is carried out
for the first time. Their fluorescence excitation and emission spectra, fluorescence lifetimes, phosphorescence excitation
and emission spectra, and phosphorescence lifetimes at room temperature are investigated. The nature of chromophores of humic
substances is discussed.
Presented at the International Symposium on Peat Organic Substances, May 15–19, 1995, Minsk, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 4, pp. 489–493, July–August, 1997. 相似文献
3.
The kinetics of fluorescence polarization in intense pulse excitation of solid disordered solutions of bichromophores that
consist of complex molecules of two types between which there can be inductiveresonance transfer of electron-excitation energy
is theoretically investigated. Variants of fluorescence excitation by single pulses and pulse trains are considered. The lifetime
of the fluorescence of a given solution increases with the intensity of the exciting pulses. The possibility of controlling
the duration of fluorescence attenuation for donor molecules incorporated into the bichromophores by the action of luminescence
radiation at the frequency of acceptor-molecule absorption on the solution is demonstrated.
Belarusian State University, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii
Vol. 65, No. 4, pp. 546–550, July–August, 1998. 相似文献
4.
The study puts toward a theoretical model describing the fluorescence parameters for concentrated solid solutions consisting
of complex molecules of two types (donor-acceptor) with nonradiative transfer of electronic-excitation energy with intense
pulse excitation. Consideration is given to the dynamics of quenching of the luminescence of the donor molecules due to transfer
of electronic-excitation energy to the acceptor molecules. Numerical results are presented in the form of approximation formulas.
To whom correspondence should be addressed.
Belarusian State University, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 66, No. 5, pp. 652–656, September–October, 1999. 相似文献
5.
With use of electron energy loss spectra for vapors of anthracene, perylene, 1,4[di(2,5-phenyloxazolyl)] benzene, and paratherphenyl
the energy yields of fluorescence are calculated for electron collision. It is shown that they are considerably smaller than
those for optical excitation conditions.
Deceased
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp. 146–148, January–February, 1998. 相似文献
6.
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
7.
N.?A.?Borisevich A.?L.?Ivanov S.?M.?Kazakov A.?V.?Kukhto A.?I.?Mit'kovets D.?V.?Murtazaliev V.?A.?Povedailo O.?V.?Khristoforov 《Journal of Applied Spectroscopy》2005,72(4):503-508
The electron energy loss spectra (EELS) of indole, 3-indolyl propionic acid, 3-indolealdehyde, 3-dimethylaminomethylindole,
tryptophan, and N-acetyl-L-tryptophan in the gas phase upon excitation by monokinetic electrons with an energy of E0 = 11–50 eV are obtained. The structure of EELS is determined in the main by the indole chromophore; the side groups, except
for the C=O group of 3-indolealdehyde, exert an insignificant influence. The energy of the lower triplet level 3La is 3.3 eV for indole and its derivatives and 3.2 eV for tryptophan and N-acetyl-L-tryptophan. Four singlet transitions in
the region of 4.4–7.2 eV have been identified. The molecules studied, except for tryptophan, fluoresce in the gas phase on
excitation by electrons. At low values of E0 (10–25 eV), the fluorescence spectra are similar and are due to the indole fluorophore. Just as in the case of optical excitation,
fluorescence on excitation by electrons is associated with the 1Lb-S0 transitions. An increase in the energy E0 up to 60–80 eV leads to dissociation of a portion of the indole molecules and to the appearance of additional bands in the
fluorescence spectrum.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 4, pp. 468–472, July–August, 2005. 相似文献
8.
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
9.
S. M. Arabei 《Journal of Applied Spectroscopy》1998,65(4):560-566
Monochromatic photoexcitation and selective registration in bands of purely electronic S1↔S0 transitions resulted in fine fluorescence and absorption (fluorescence excitation) spectra of hypericin in polyvinylbutyral
at a temperature of 4.2 K. Vibration analysis of the spectra is done and conclusions are made about the form of many normal
vibrations. It is found that the formation of intramolecular hydrogen bonds in the hypericin structure has a substantial effect
on the relative position of the electronic vibrational levels of the pigment molecule.
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina ave., Minsk 200072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 4, pp. 539–545, July–August, 1998. 相似文献
10.
A. A. Akhrem N. A. Borisevich O. V. Gulyakevich A. L. Mikhal’chuk T. F. Raichenok G. B. Tolstorozhev 《Journal of Applied Spectroscopy》1998,65(3):323-326
Experiments on observation of the luminescence of 8-azasteroid derivatives and its regularities are carried out for the first
time. Strong solvent and excitation wavelength dependences are observed for fluorescence spectra of the compounds investigated,
whereas their fluorescence excitation spectra depend only weakly on the fluorescence emission wavelength. An analysis of the
data obtained points to the complex character of the electronic structure, important role of intramolecular dynamics, and
multicenter character of the behavior of these systems upon absorption of light.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 3, pp. 315–318, May–June, 1998. 相似文献
11.
Spectral characteristics of solutions of complex molecules under conditions of inhomogeneous broadening of energy levels are
considered in the case when the nonlinear dependence of the population of molecular states on the excitation intensity is
determined not by saturation of molecular levels but by exchange of the electronic excitation energy with the environment.
Calculations have shown that the dependence of the position of the fluorescence spectrum on the excitation frequency is nonmonotonic
in solutions of the type and varies substantially with the excitation intensity.
Belarusian State University, 4, F. Skorina Ave., Minsk, 220072, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 64, No. 2, pp. 164–168, March–April, 1997. 相似文献
12.
V. N. Knyukshto A. M. Shul’ga E. I. Sagun É. I. Zen’kevich 《Journal of Applied Spectroscopy》1998,65(6):943-951
It is established experimentally for the first time that Zn-octaethylporphyrin in a solution of dried methyl cyclohexane is
in unliganded form in the temperature interval of 293-77 K. This form is characterized by the shortest-wave position of absorption
and luminescence spectra, the independence of the degrees of fluorescence and phosphorescence polarizations from the excitation
wavelength, and high phosphorescence time (τT=126 μsec) and quantum yield (φp=0.085) at 77 K. Adding electrodonor components to the methyl cyclohexane or going over to
alcohol-containing polar media leads to the formation of a monoliganded form of ZnOEP, for which we observe a bathochromic
shift of ≈150–350 cm−1 for Q(0,0) absorption and luminescence bands, a splitting of ≈50–100 cm−2 for the Q(0, 0) absorption band, and phosphorescence quenching (τT=60 μsec, φp=0.05-0.03 at 77 K). The effects revealed are explained by a decrease in the symmetry of a ZnOEP molecule in extra
liganding and by an increase in the probability of nonradiative activation for a T1-state due to the extra ligand being involved in the exchange of electron-excitation energy and to the enhancement of a spin-orbital
coupling as a result of the disturbance of the planarity, of a macrocycle.
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. 900–907, November–December, 1998. 相似文献
13.
V. V. Gruzinskii S. M. Kazakov M. N. Kaputerko I. I. Kulak V. A. Suchkov 《Journal of Applied Spectroscopy》1998,65(2):224-231
Information on paths in absorption and deactivation of energy gained by molecules in their excitation by electron impact to
low-lying singlet states has been obtained from an analysis of changes in the fluorescence spectra of these molecules. It
is shown that there is a significant difference in the formation of fluorescence spectra when free molecules are excited by
optical radiation and by electrons. It contrast to optical excitation, the interaction of an electron with a molecule is nonselective
in character. All electronic states have a chance to be excited, which results in ensembles of emitting molecules with a different
store of vibrational energy, and these ensembles each contribute to the fluorescence spectrum.
Deceased.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 2, pp. 216–223, March–April, 1998. 相似文献
14.
T. A. Pavich A. V. Vorobey S. M. Arabei K. N. Solovyov 《Journal of Applied Spectroscopy》2012,79(4):651-655
We have synthesized a folic acid–europium complex conjugate which shows promise for biomedical applications. We have studied the absorption spectra, the luminescence spectra, and the luminescence excitation spectra of folic acid–spacer–amino-substituted phenanthroline and folic acid–spacer–europium chelate conjugates, and also of the individual components of the synthesized triads. All the spectral luminescence data obtained confirm that a folic acid–europium complex conjugate is fogrmed. Binding of the synthesized conjugate to a folate receptor on HeLa tumor cells is demonstrated. 相似文献
15.
M. M. Asimov B. A. Bushuk M. A. Senyuk A. P. Stupak A. N. Rubinov 《Journal of Applied Spectroscopy》1999,66(5):697-700
Results of an investigation of the influence of the process of complex formation on the spectral and luminescence characteristics
of aqueous solutions of inclusion complexes of β-cyclodextrin with rhodamine 6G are reported. It is shown that complex formation
of rhodamine 6G proceeds mainly in the outer sphere of β-cyclodextrin.
To whom correspondence should be addressed.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 5, pp. 619–621, September–October, 1999. 相似文献
16.
A. V. Kukhto É. É. Kolesnik I. N. Kukhto V. K. Ol’khovik N. A. Galinovskii V. E. Agabekov S. M. Kazakov A. L. Ivanov 《Journal of Applied Spectroscopy》2007,74(5):760-764
We have measured the energy loss spectra of 4,4′-bis[(E)-1-(1,3-benzoxazol-2-yl)-2-ethenyl]-2-n-hexyloxy biphenyl for interaction
with electrons with energies 17.5 eV and 50 eV. We used time-dependent density functional theory to calculate spectra of the
singlet transitions, which match the experimental data well. We have shown that the cross section for the long-wavelength
transitions is greater than the cross section for the short-wave transitions, which is attractive for efficient excitation
by low-energy electrons. Electroluminescence was achieved for the studied compound. The threshold voltage was 3.5 V. Introducing
an additional layer of copper phthalocyanine increases the brightness of the luminescence several-fold.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 5, pp. 684–687, September–October, 2007. 相似文献
17.
I. I. Shafranyosh V. V. Stetsovich N. N. Chavarga M. I. Sukhoviya 《Optics and Spectroscopy》2012,112(2):155-158
We have measured the luminescence spectra of isolated uracil molecules in the wavelength range of 200–500 nm that were excited
by slow electrons. The spectrum contains more than 20 spectral bands and lines. We show that the luminescence spectrum of
uracil is formed by processes of dissociative excitation of molecules, dissociative excitation with ionization, and excitation
of electronic states of the initial molecule and molecular ion. 相似文献
18.
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
19.
A theoretical study was carried out to investigate concentration self-quenching which is nonlinear in intensity in a molecular
system caused by nonradiative electronic excitation energy transfer to relatively long-lived acceptors that are formed in
a solution and whose function is performed by molecules that have acquired the triplet state. It is shown that at ratios of
constants of radiative and nonradiative transitions typical of complex molecules at concentrations of ∼10−3–10−2 mole/liter substantial (2- to 10-fold) fluorescence takes place at intensities of excitation of ∼104–103 of the intensity of saturation for a singlet subsystem. Polarization characteristics of the system are analyzed.
Belarusian State University, 4, F. Skorina Ave., 220050, Minsk, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 64, No. 6, pp. 729–733, November–December, 1997. 相似文献
20.
The methods of selective laser spectroscopy applied at 1.8–10 K to a glass-forming tetrahydrofuran-toluene (3∶1) mixture have
revealed that in the dimers of tetrapyrrole compounds (ethane-bis-octaethylporphyrins, ethane-bis-Zn-octaethylchlorins, heterodimers
of Zn-cyclopentane porphyrins) the exciton interactions (V12≈118 cm−1) and S-S-transfer of energy (of probability F≈11 sec−1) are implemented under conditions of substantial inhomogeneous broadening (δF1/2≈50 cm−1). Upon excitation of a donor component in the dimers, one observes a strong quenching of its emission, the disappearance
of the fine structure in the fluorescence spectra, a decrease in the efficiency of spectral hole burning by, approximately,
an order of magnitude, and a 12-fold increase in their halfwidth.
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. 500–504, July–August, 1999. 相似文献