Calculation of the intensity and dichroism of the IR absorption bands of oriented polymers

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.     

Separating overlapping bands in the IR spectra of polymers

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 51, No. 1, pp. 58–63, July, 1989.     

Identification of absorption bands corresponding to C-C1 stretching vibrations in the IR spectra of organic compounds

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 55, No. 3, pp. 392–396, September, 1991.     

IR absorption spectra of N-substituted tetrazoles

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 54, No. 6, pp. 923–933, June, 1991.     

Intensities of bands in the IR spectrum and conformation of polyethylene terephthalate

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 52, No. 1, pp. 82–88, January, 1990.     

Method for assigning absorption bands in IR spectra of polyatomic molecules with respect to internal vibrational coordinates

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. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 2, pp. 169–173, March–April, 2007.     

Effect of very high pressure on the optical absorption spectra in CsI

The effect of very high pressure on the fundamental optical absorption edges in CsI crystal was investigated between u.v. and near i.r. region by a diamond anvil type high pressure cell. With increasing pressure the fundamental absorption edge energy in CsI shifts from u.v. to i.r. region. At the pressure of 45 GPa the CsI becomes completely opaque. When the indirect band gap is assumed for CsI at high pressures, the insulator to metal transition in CsI is expected to occur at about 70 GPa from the pressure versus absorption edge curves. The availability of CsI as one of the pressure standard up to 50 GPa region is also discussed.     

Effect of neutron irradiation on the IR absorption spectra of cupric oxide single crystals

A strong increase of the absorption coefficient with photon energy increasing from 0.1 to 1.0 eV is observed in the spectra of CuO single crystals irradiated with neutrons to a fluence of 5×10¹⁸ cm⁻². The difference of the absorption coefficients before and after irradiation depends on the wavelength as λ⁻². The effect of neutron irradiation on CuO is qualitatively similar to that of neutrons on other semiconductors (for example, GaAs) and differs from that obtained by irradiating CuO with charged particles. Zh. Tekh. Fiz. 69, 98–99 (December 1999)     

Photonic absorption bands in the spectra of nanoporous metallic films

The light absorption spectra of multilayer nanoporous metallic films containing spherical dielectric inclusions are calculated in the framework of the self-consistent electrodynamic approach (the Korringa-Kohn-Rostoker method). It is demonstrated that the coupling between Mie plasmons in different layers of nanopores leads to the formation of strong light absorption bands over a wide range of frequencies.