共查询到20条相似文献,搜索用时 31 毫秒
1.
V. S. Burakov A. V. Isaevich P. Ya. Misakov S. N. Raikov 《Journal of Applied Spectroscopy》1998,65(1):25-31
Narrow atomic absorption lines of Ba, Cs, Mg, and Tl are recorded in an electrothermal atomizer with a graphite tube furnace
by the intracavity laser spectroscopy method. The conditions of applicability of this laser absorption method for reducing
the observed profiles of spectral lines to the true ones are found. Measurement of the integral absorption coefficient has
made it possible to determine the absolute number of free atoms of each element in the analyte volume at the maximum of the
absorption peak under optimum conditions of atomizer heating. The Voigt parameters are determined from the profiles of absorption
lines.
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. 27–33, January–February, 1998. 相似文献
2.
F. Gueye E. Safari M. Chenevier G. Guelachvili N. Picqué 《Applied physics. B, Lasers and optics》2005,81(8):1143-1147
A high-resolution time-resolved Fourier transform interferometer is combined with a multimode Cr4+:YAG laser for intracavity laser absorption spectroscopy (ICLAS) experiments. Atmospheric absorption spectra are recorded
in the 1.5 μm region with a minimum detectable absorption coefficient equal to 8×10-11 cm-1 Hz-1/2. The broad gain bandwidth of the crystal allows a simultaneous spectral coverage at most equal to 38 nm. The laser tunability
covers the 1360–1577 nm range. Water vapor detection domain extends from the 100 ppmv down to the 0.1 ppbv level.
PACS 42.62.Fi; 39.30.+w; 07.60.Ly; 33.20.Ea 相似文献
3.
S. A. Mikhnov 《Journal of Applied Spectroscopy》1999,66(6):994-998
It has been found that the F-band of optical absorption which is observed in ψ-irradiated NaF crystals consists of three overlapping
bands. The band at 345 nm of width 40 nm is independent of the impurity composition of the crystals; it disappears upon exposure
to radiation at 345 nm and appears again upon annealing at 460±15 K for 15 min. This band is correlatable in intensity with
the superfine structure of an EPR spectrum. The width (65–110 nm) and the spectral position (355–375 nm) of the second band
depend on the impurity composition of the crystal. The band of width 90–110 nm at 320–325 nm disappears upon annealing and
appears after exposure to light simultaneously with the disappearance of an EPR signal. It is established that the band at
345 nm is caused by quasimolecules based on fluorine atoms, that at 355–375 nm is triggered by F-centers with a different
impurity composition near the haloid vacancy, and the band at 320–325 nm owes its appearance to F-centers in a negatively
charged state (F′).
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. 6, pp. 849–853, November–December, 1999. 相似文献
4.
V. A. Zaitseva L. P. Lovchikova E. K. Naumenko S. I. Kononovich S. V. Nikonenko V. E. Plyuta 《Journal of Applied Spectroscopy》1997,64(1):88-93
Under land-based conditions, in the wavelength range 420–780 nm spectral brightness coefficients were measured for poppy crops
and typical soils in the flood plains and piedmont and mountain areas of Central Asia and also for particular phytoelements
(leaves, flowers, and balls). The effect of irradiation conditions, sowing dates, and vegetative phases on the spectral brightness
coefficients was analyzed. Specific features of the phytoelements were revealed that can be used for remote estimation of
the vegetative phase of poppy crops.
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 85–89, January–February, 1997. 相似文献
5.
We present a novel interferometric setup operating in the XUV spectral range. The interferometer consists of a combination
of a double pinhole (similar to Young’s double slit) and a transmission grating. In the case of a light source consisting
of discrete spectral lines, it allows recording interferograms for multi-colors simultaneously. We present two experiments
in which high-order harmonics generated by a titanium sapphire laser were used as the light source for the interferometer.
First, the temporal coherence lengths of the single harmonics were determined, and second, the index of refraction and the
absorption of a thin beryllium foil were measured simultaneously in the range of 17–25 nm. 相似文献
6.
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
7.
A. K. Shuaibov Z. T. Gomoki A. G. Kalyuzhnaya A. I. Shchedrin 《Optics and Spectroscopy》2010,109(5):669-673
The UV radiation of glow- and capacitive-discharge lamps based on mixtures of inert gases with iodine vapors are optimized
in the spectral range of 175–360 nm, in which working helium-iodine mixtures of different compositions are used. The most
intense spectral lines in the bactericidal region of the spectrum were the atomic lines of iodine (183.0, 206.2 nm), and in
the region of 320–360 nm, emission of the spectral band of an iodine molecule prevailed with a maximum at λ = 342 nm. For
a capacitive lamp with a casing opaque in the spectral range λ < 250 nm, the main part of the plasma emission power is concentrated
in the A′-D′ band of an iodine molecule with a maximum at 342 nm. The emission brightness of this lamp is optimized in iodine molecule
transitions depending on the partial helium pressure. We present the results of simulating the kinetics of processes in a
glow-discharge plasma in mixtures of He, Xe, and iodine vapors. We establish the dependence of the main part of the emission
intensity of the 206.2 nm spectral line of an iodine atom and the 342 nm band of an iodine molecule on the helium pressure
in a glow-discharge lamp operating on a He-I2 mixture. 相似文献
8.
We carried out measurements of the spectral distribution of wideband dye laser generation intensity within the limits and
in the vicinity of an absorption line with its simultaneous recording at the frequencies of the fundamental and second harmonics
of laser radiation. In the laser cavity we placed optical cuvettes with active and absorbing media, as well as selecting and
nonlinear-optical elements. We show that at double frequencies the contrast of the narrow-band hole in the multimode laser
generation spectrum increases. The gain in the concentration sensitivity of measurements depends in this case on the value
of the absorption coefficient being determined.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., 220072, Minsk, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 4, pp. 516–521, July–August, 1998. 相似文献
9.
We proposed and tested a method of detecting and determining the content of asymmetric dimethylhydrazine (ADMH) in the atmosphere
based on measuring the absorption spectra in the near IR spectral region. The method is shown to permit confident diagnostics
of the presence of an ADMH cloud in the atmosphere with a concentration of several maximum permissible concentrations (MPC).
A. N. Sevchenko Scientific-Research Institute of Physical Problems, 7 Kurchatov Str., Minsk, 220064, Belarus; e-mail: valakh@pfp.bsu.unibel.by.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 796–799, November–December, 1999. 相似文献
10.
V. I. Blynskii 《Journal of Applied Spectroscopy》1998,65(2):308-310
The spectral dependence of the coefficient of photoelectric coupling between photosensitive elements in rulers of silicon
bipolar transistors is investigated. It is shown that in the spectral range 0.5–1.0 μm with weak radiation power the coefficient
of photoelectric coupling in bipolar phototransistors with separate bases is lower than in photodiode rulers.
Institute of Electronics, National Academy of Sciences of Belarus, 22, Logoiskii Trakt, Minsk, 220090, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 2, pp. 293]2-295, March–April, 1998. 相似文献
11.
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
12.
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
13.
The output emission characteristics are presented in the spectral range 150–350 nm for a longitudinal bromine vapor glow discharge
in a quartz tube (inner diameter 1.4 cm, interelectrode distance 10 cm). Pressure of the working mixtures: P = 0.2–1.0 kPa.
The emission spectrum of the lamp based on an He-Br2 mixture consists of the 163.3 nm and 157.6 nm spectral lines of the bromine atom and a system of molecular bromine bands
(170–300 nm). The total power of UV-VUV emission of the lamp based on an He-Br2 mixture is 5 W max for efficiency <10%.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 816–819, November–December, 2007. 相似文献
14.
Christophe Hecquet Franck Delmotte Marie-Fran?oise Ravet-Krill Sébastien de Rossi Arnaud Jérome Fran?oise Bridou Fran?oise Varnière Evgueni Meltchakov Frédéric Auchère Angelo Giglia Nicola Mahne Stefano Nanaronne 《Applied Physics A: Materials Science & Processing》2009,95(2):401-408
In this paper, we present a study on two-channel multilayer mirrors which can operate at two wavelengths in Extreme Ultraviolet
(EUV) spectral range. We propose a new method to design two-channel EUV multilayer mirrors with enhanced spectral selectivity.
The mirror structure is a stack of two periodic multilayers separated by a buffer layer. We have defined the main parameters
which allow adjustment of the distance between different order Bragg’s peak and of wavelength positions of reflectivity minima.
Two mirrors have been designed and deposited for solar EUV telescope applications by using this method. The first mirror reflects
Fe IX–X line (17.1 nm) and Fe XVI (33.5 nm) lines with attenuation of the He II line (30.4 nm). The second mirror reflects
Fe IX–X and He II lines with attenuation of Fe XV (28.4 nm) and Fe XVI lines. Measurements with synchrotron radiation source
confirm that, in both cases, for these mirrors, we are able to adjust reflectivity maxima (Bragg peak position) and minima.
Such multilayers offer new possibilities for compact design of multi-wavelength EUV telescopes and/or for high spectral selectivity. 相似文献
15.
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
16.
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
17.
B. M. Dzhagarov 《Journal of Applied Spectroscopy》1999,66(4):516-520
Based on the results of studying hemoglobin and myoglobin molecules using the methods of laser absorption spectroscopy of
superhigh time resolution, we described photophysical and spectral properties of excited states, and intramolecular electronic
and thermal relaxation processes. A mechanisms of the photodissociation reaction of oxy forms of these proteins is proposed
and substantiated.
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. 479–482, July–August, 1999. 相似文献
18.
Using the method of phase-sensitive detection, we investigated the photoconductivity spectra of polycrystalline p-CuInSe2 films obtained in vacuum by the method of pulsed laser vaporization of initial single crystals. We show that, in contrast
to single crystals, films are characterized by monopolar photoconductivity in the extrinsic and intrinsic regions of optical
absorption and by a linear mechanism of recombination of nonequilibrium charge carriers at the intensities of illumination
0–100 mW/cm2 in the temperature range 80–300 K.
Institute of the Solid-State and Semiconductor Physics, National Academy of Sciences of Belarus, 17, P. Brovka St., Minsk
220072, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii. Vol. 66, No. 1, pp. 138–141, January–February, 1999. 相似文献
19.
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
20.
M. L. Petukh A. D. Shirokanov A. A. Yankovskii A. P. Byk I. I. Kravtsevich A. E. Sikolenko V. S. Polzikova 《Journal of Applied Spectroscopy》1998,65(2):297-299
It is shown that the use of a multielement photodetector (CCD strip) as an attachment to a steeloscope eliminates the subjectivity
of visual analysis, makes it possible to obtain operative information on measurement results, extends the spectral range of
the device, and improves the working conditions of analysts.
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. 2, pp. 284–286, March–April, 1998. 相似文献