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1.
Hrant Yeritsyan Vachagan Harutiunian Volodia Gevorkyan Norair Grigoryan Eleonora Hakhverdyan Sergey Nikoghosyan Aram Sahakyan Rudolf Gevorgyan Hakob Sargisyan Yeghis Keheyan 《Central European Journal of Physics》2005,3(4):623-635
Infrared (IR) absorption and luminescence in chemically and radiation-modified natural Armenian Zeolite (clinoptilolite) samples
have been studied. The luminescence was studied in 390–450 nm and 620–710 nm wavelength bands, and the IR measurements were
carried out in the 400–5400 cm−1 range. It is shown that the luminescence intensity depends on the content of pure clinoptilolite in the samples and, probably
on the distribution of “passive” luminescence centers over Si and Al sites that became “active” under radiation or chemical
treatment. The samples of electron irradiated clinoptilolite have higher luminescence intensity than the chemically and thermally
treated ones. A decrease in the intensity of IR absorption bands at 3550 cm−1 and 3650 cm−1 was found after irradiation. 相似文献
2.
A spectral-optical investigation of the color of the red plum peel found in different aggregate states has been performed
with the aim of its standardization in accordance with the demands of the food industry. The absorption spectra as well as
the rotary dispersion and linear dichroism spectra of this food color have been obtained. The latter made it possible to reveal
bands of individual pigments of the above-indicated color, “latent” in its absorption spectrum, and determine the positions
of their maxima.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 563–565, July–August, 1999. 相似文献
3.
From the independence of the contour of spectral density of the rotational (orientation) correlation function of a rigid molecular
top of arbitrary symmetry on temperature in the frequency scale based on the reduced time of rotational orientation relaxation
and from the near independence of the rotational contour of vibrational and vibronic absorption bands of dipole transitions
in the same coordinates in a model of “regular diffusion” of the transition oscillator with a classically rotating rigid molecular
top, it is suggested that it is possible to use the halfwidth of the contour for estimation of temperatures. Data are presented
on the halfwidth of 48 contours of bands of A, B, and C types at this frequency for 12 compounds for a temperature range of
from units to 500 degrees of absolute temperature measured experimentally and (for low temperatures) calculated by the quantum
theory.
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. 3, pp. 312–317, May–June, 1997. 相似文献
4.
I. S. Mikhalovsky M. V. Samoylov N. P. Wileishikova 《Journal of Applied Spectroscopy》2009,76(1):127-131
IR spectroscopy is used for a comparative analysis of the trans-isomerization of double bonds in hydrocarbon residuals of lactic and hydrogenated lipids. The maximum of the absorption band
of the trans-isomers for all the lipid samples is found to lie at 965 cm−1. An absorption band at 970 cm−1 is discovered in the spectra of the lactic lipids near the analytic band of the trans-isomers at 965 cm−1. Based on a gaussian approximation for their absorption spectral bands, the trans-isomer content in the lactic lipid samples is 10–11%. The absorption by lipid molecules at 970 cm−1 has to be taken into account when determining the trans-isomer content of fat and oil products.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 1, pp. 138–142, January–February, 2009. 相似文献
5.
We measured the dispersion of light in thin Y2O3 films in the visible and near UV regions of the spectrum. The spectrum of edge absorption is investigated. We found the parameters
of a single-oscillator approximation and determined the dispersion energy and the ionicity of bonding.
I. Franko L’vov State University, 50, Dragomanov St., L’vov, 290005, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 64, No. 5, pp. 651–654, September–October, 1997. 相似文献
6.
Experimental absorption spectra of benzene, isooctane, and their mixtures are obtained in the wavelength range λ = 1620–1820
nm in which the first overtones of vibrational frequencies of CH, CH2, and CH3 hydrocarbon groups are located. Positions of fundamental absorption bands of benzene are refined. Absorption spectra of benzene-isooctane
mixtures are shown to intersect in a narrow area near λ ≈ 1695 nm. The main maximum of benzene absorption at λ = 1671.5 ±
0.5 nm, where the influence of isooctane absorption is practically absent, is proposed for determining the content of benzene
in benzene-isooctane mixtures. A linear calibration curve for λ = 1671.5 nm that encompasses the full range of benzene concentrations
(0–100%) is presented.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 5, pp. 631–634, September–October, 2008. 相似文献
7.
The dynamics of formation of optical radiation in spectral lines in a longitudinal nanosecond helium discharge under conditions
of wave breakdown is investigated. A discharge tube with a diameter of 0.4 cm and a length of 50 cm was placed in a metallic
shield 1 cm in diameter. The gas pressure was varied within 1–60 torr for an amplitude of the voltage pulses of up to 50 kV.
Asymmetry of spontaneous radiation recorded from different ends of the discharge tube is detected. This is shown to be a consequence
of nonuniform distribution of the functions of the primary brightness of the flux and the absorption coefficient along the
tube length.
Dagestan State University, 43a, M. Gadzhiev Str., Makhachkala, 367025, Russia. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 66, No. 3, pp. 415–420, May–June, 1999. 相似文献
8.
Stable-plasma generators, spectroscopic measuring equipment, and methods for determining the optical properties of an extremely
heated medium with a given composition have been developed. The spectral coefficients of absorption and emission of heated
air, carbon dioxide, and argon were studied. A comparison with the data of other theoretical and experimental investigations
has been performed.
Deceased.
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. 6, pp. 818–826, November–December, 1997. 相似文献
9.
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
10.
K. P. Kureichik S. N. Pupkevich V. S. Granos I. S. Kharamchenkov 《Journal of Applied Spectroscopy》1999,66(5):851-854
We describe a modified GELIOS System intended to automate the atomic-absorption spectrometers AAS, S115, SATURN, and Perkin-Elmer
503. Software is prepared in the visual environment of programming DELFI-3 and functions under the control of Windows 95.
A distinguishing feature of the GELIOS System is simultaneous search for the peak and area of the absorption signal, correction
of the errors of measurements, automatic digital filtration of data, control of the time of operation of hollow-cathode lamps,
measurement of spectra and the statistical resource of the service life of hollow-cathode lamps, use of different methods
to construct a calibrating graph, the possibility of memorizing the data of the analysis in an archived file, and a formation
of the report for printing. The system contains an electrovic data directory on atomicabsorption analysis in five volumes
for 67 elements of the Mendeleev system.
To whom correspondence should be addressed.
“University” Science and Production Center, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi
Spektroskopii, Vol. 66, No. 5, pp. 734–737, September–October, 1999. 相似文献
11.
The yrast bands of even-even selenium isotopes with A = 68–78 are studied in the framework of projected shell model, by employing quadrupole plus monopole and quadrupole pairing
force in the Hamiltonian. The oblate and prolate structures of the bands have been investigated. The yrast energies, backbending
plots and reduced E2 transition probabilities and g-factors are calculated and compared with the experimental data. The calculated results are in reasonably good agreement with
the experiments.
相似文献
12.
Koteski V. Reinhold B. Haas H. Holub-Krappe E. Mahnke H.-E. Wruck D. 《Hyperfine Interactions》2001,136(3-8):681-685
X-ray absorption spectroscopy has been used to obtain information on the local structure around Zn atoms in CdTe. The Zn–Te
distance is 5% smaller than the Cd–Te bond-length in the bulk, but slightly larger than in pure ZnTe. A similar effect is
predicted by FLAPW calculations.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
13.
Spectra of x-ray radiation-induced absorption of SrCl2−Ce crystals in the region of 340–830 nm under the effect of selective irradiation in the induced-absorption bands by both
conventional and laser sources are investigated. It is established that irradiation of sufficient intensity causes irreversible
photochemical transformations of PC, PC+, and Ce2+ color centers their destruction, and restoration of the transparency of the crystals.
To whom correspondence should be addressed.
I. Franko Lvov State University, 8, Kirill and Mefodii Str., Lvov, 290005, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 66, No. 5, pp. 666–668, September–October, 1999. 相似文献
14.
A. P. Losev S. M. Bachilo D. I. Volkovich Yu. S. Avlasevich K. N. Solov’yov 《Journal of Applied Spectroscopy》1997,64(1):62-71
Photoinduced electron transfer (PET) in a Pd-porphyrin-quinone complex (Pd-P-Q) was investigated using the flash photolysis
method in microsecond and picosecond range and by luminescence. The investigations were performed for toluene solutions. Intramolecular
PETs in the lower excited singlet state (kCT=1.7·1010 sec−1) and in the triplet state (kCT=2.5·108sec−1) were observed. For a quantum yield of the triplet state that is close to 1 in Pd-porphyrin (Pd-P) this yield is equal to
0.4 in Pd-P-Q. This decrease is the result of PET in the excited state and, possibly, in an unrelaxed triplet state. Triplet
Pd-P-Q molecules were efficiently quenched by unexcited molecules, and this process is related to intermolecular charge transfer.
This electron transfer is likely to occur from the Pd-P protion of an excited molecule to the quinone protion of an unexcited
molecule in the collisional complex (Pd-P-Q)2. Charged radicals, formed once the collisional complex is transferred and separated, have a wide absorption band with a maximum
of about 960 nm. The average lifetime of the radicals was about 2 msec.
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. 61–70, January–February, 1997. 相似文献
15.
L. Kovács M. Mazzera E. Beregi R. Capelletti 《Applied physics. B, Lasers and optics》2009,94(2):273-277
Several weak absorption bands have been observed in the optical absorption spectra of pure and rare-earth-doped YAl3(BO3)4 single crystals in the 3350– 3650 cm−1 wave number region. Two of them, peaking at about 3377 cm−1 and 3580 cm−1 in the 8 K spectra, appear in most of the samples. They are tentatively attributed to the stretching mode of OH− ions incorporated in the crystal during the growth. An additional absorption band at about 5250 cm−1 at 8 K has also been detected in almost all samples. The temperature and polarization dependences of these bands, and their
possible origin, are discussed. 相似文献
16.
Steady-State and Time Resolved Fluorescence Analysis on Tyrosine–Histidine Model Compounds 总被引:1,自引:1,他引:0
Four model compounds, for a tyrosine–histidine covalent bonding, 2-(5-imidazolyl)-4-methylphenol (C–C bonding in ortho-position at the phenyl group); 2′-(1-imidazolyl)-4-methylphenol (C–N bonding in ortho′-position at the phenyl group); 2-(5-imidazolyl)-4-H-phenol and 2-(5-imidazolyl)-4-H-phenol, at physiological pH have been
studied by UV-Vis absorption, steady-state and time resolved fluorescence spectroscopy. Their absorption and emission properties
are presented and discussed. The photophysical properties depend on the para-substituted phenyl group as well as on C–C/C–N bonding in the Phenol–Imidazole linkage. The N position, N1–N3/N1–N4, in the imidazole group was found to be relevant. The results are discussed with relevance to the redox processes of tyrosine
and to better understand the role of a tyrosine–histidine covalent linkage as found in cytochrome c oxidase. 相似文献
17.
Regression relations between the first main component, slope of the SBC curve towards the wavelength axis, and the degree
of mineralization of peat soils are established from experimental data. Errors in determination of peat soil productivity
are estimated using different spectral indices. For practical use it is recommended to measure the spectral brightness coefficients
of peat soils in the 0.50–0.75 μm range.
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. 1, pp. 102–106, January–February, 1998. 相似文献
18.
V. A. Galievskii V. S. Chirvonyi S. G. Kruglik P. A. Apanasevich V. V. Ermolenkov V. A. Orlovich L. Chinsky P. -Y. Turpin 《Journal of Applied Spectroscopy》1995,62(2):275-284
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 110–121, March–April, 1995. 相似文献
19.
LiCoO2 thin films were prepared by electron beam evaporation technique using LiCoO2 target with Li/Co ratio 1.1 in an oxygen partial pressure of 5 × 10−4 mbar. The films prepared at substrate temperature T
s < 573 K were amorphous in nature, and the films prepared at T
s > 573 K exhibited well defined (104), (101), and (003) peaks among which the (104) orientation predominates. The X-ray photoelectron
spectroscopy (XPS) and inductively coupled plasma (ICP) data revealed that the films prepared in the substrate temperature
range 673–773 K are nearly stoichiometric. The grain size increases with an increase of substrate temperature. The Co–eg absorption bands, are empty and their peak position lies at around 1.7 eV above the top to the Co–t2g bands. The fundamental absorption edge was observed at 2.32 eV. The films annealed at 1,023 K in a controlled oxygen environment
exhibit (104) out plane texture with large grains.
Paper presented at the Third International Conference on Ionic Devices (ICID 2006), Chennai, Tamilnadu, India, Dec. 7–9, 2006 相似文献
20.
Conclusions The studies performed here have shown that the superlattice samples studied exhibit photoluminescence spectra which agree
with the Kronig-Penney model, although in calculating the energies of the radiative transitions it is necessary to take into
account the binding energy of the excitons,E
B. Due to the exciton—phonon interaction, the 1HH peak breaks up on the long wavelength side into a Poisson distribution. The
energy of the LO phonon so determined is 34 meV. Bands due toD
0-A
0 andD
0X transitions, caused by remaining low-level impurities in the GaAs crystals are also observed.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 61, Nos. 3–4, pp. 241–245, September–October, 1994. 相似文献