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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 55, No. 3, pp. 431–438, September, 1991. 相似文献
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For an ensemble of different types of luminescence centers with overlapping absorption bands, with no restrictions on the
optical densities, we have obtained relations describing the luminescence excitation spectra for each type of center. We consider
transformations of the relations in some limiting cases. We suggest a procedure for using the equations obtained to determine
the characteristics of the luminescence centers. Some of these procedures have been experimentally implemented in study of
intrinsic radiation color centers in lithium fluoride crystals. We have determined the ratios of the luminescence quantum
yields for F2 and F3+ color centers, and we have observed that a major role is played by nonradiative transitions in deactivation of the first
excited singlet state of F3+ centers.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 3, pp. 365–371, May–June, 2008. 相似文献
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Kh. Sh. Abdulov 《Journal of Applied Spectroscopy》2005,72(1):138-141
An algorithm for calculating the intensity and dichroism of polarized IR absorption bands of oriented polymers is proposed. The absorption curves in the IR spectrum of amorphous cis-1,4-polyisoprene and the dichroism of its absorption bands have been calculated. The polarization IR spectra of oriented amorphous cis-1,4-polyisoprene for a stretching ratio equal to 3 have been constructed. The calculated values of the absorption-band dichroism are in fairly good agreement with the experimental data.__________Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 1, pp. 129–132, January–February, 2005. 相似文献
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V. A. Aulov 《Optics and Spectroscopy》2009,106(2):227-228
The investigation of the IR spectra of compacted reactor powders of ultra-high-molecular-weight polyethylene showed that the intensities of the absorption bands depend on the compaction pressure; namely, they decrease with increasing pressure. It is found that the ultimate pressure above which the absorption band intensity ceases to decrease depends on the spectral position of the band; the shorter the wavelength, the higher the ultimate pressure. This pressure is 5–10 MPa for bands in the long-wavelength spectral region (the band at 720 cm?1) and 100 MPa for the short-wavelength region (the band at 5875 cm?1). It is assumed that this phenomenon is related to a change in the size of pores d with pressing. Beams with wavelengths λ < d will undergo multiple diffuse reflections and reach a photodetector that is weaker than beams with λ > d. With increasing pressure, the size of pores decreases and the boundary between the two regions of the spectra shifts to short wavelengths. 相似文献
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B. V. Lopatin V. G. Vinokurov N. B. Lopatina V. A. Berdyugin 《Journal of Applied Spectroscopy》1991,55(3):863-866
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 55, No. 3, pp. 392–396, September, 1991. 相似文献
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Kh. Sh. Abdulov 《Journal of Applied Spectroscopy》2007,74(2):188-193
A method is proposed for assigning absorption bands in IR spectra of polyatomic molecules. An algorithm is developed and a
Fortran program is written based on this method. The method is illustrated for the example of the toluene molecule.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 2, pp. 169–173, March–April, 2007. 相似文献
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