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Article
Raman Scattering Study of Natural and Synthetic Compounds Containing Polyene Chains
The dependence of Raman spectra of the molecules containing polyene chains on the conjugation length, structure of side and end groups, and isomer type is analyzed theoretically.
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Article
Raman structural study of random copolymers of propylene with 1-pentene
Nascent form of random propylene/1-pentene copolymers was studied for the first time by Raman spectroscopy. For the purpose of detailed interpretation of the copolymer spectra, we investigated Raman spectra of...
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Article
Raman structural study of random copolymers of ethylene with 1-hexene
Ethylene/1-hexene copolymers, which differ significantly in 1-hexene content (from 1.9 to 37.0 mol %), are studied by Raman spectroscopy. The copolymer spectra are compared with the Raman spectra of polyethyle...
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Article
Raman spectra of various polymorphs of isotactic polypropylene
The Raman spectra of the α, γ, and smectic modifications of isotactic polypropylene (PP) are studied. The most significant spectral differences are observed in the frequency range around 2960 cm−1 for the spectra...
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Article
Polarized Raman study of random copolymers of propylene with olefins
The polarized Raman spectroscopy is employed in the study of structural modifications in the films of isotactic polypropylene (PP) whose chain contains ethylene, 1-butene, 1-hexene, 1-octene, and 4-metyl-pente...
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Article
Raman study of polyethylene-polypropylene blends
The Raman spectra of the blends that result from the melt mixing of polyethylene (PE) and isotactic polypropylene (PP) are studied. The contents of the blend components can be determined using the ratio of the...
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Article
The treatment of the hyper-Raman scattering by 2LO phonons in semiconductors with equal effective masses of electrons and holes
The theoretical investigation of the hyper-Raman scattering by 2LO phonons is carried when the doubled energy of incident photons lies near the band gap of a semiconductor. The scattering process is considered...
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Article
Quantitative characterization of the orientation of macromolecules in intercalated nanocomposites of polyolefins/layered silicates by Raman spectroscopy
Raman spectroscopy is used to study variations in the orientational order of macromolecules in the uniaxially drawn intercalated nanocomposites based on two polymer matrices (polyethylene (PE) and isotactic po...
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Article
Raman study of ethylene-propylene copolymers and polyethylene-polypropylene reactor blends
The Raman spectra of the ethylene-propylene copolymers (EPC) synthesized using new metallocene catalytic systems and the polypropylene/polyethylene/diblockcopolymer of propylene and ethylene (PP/PE/DBC) blends...
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Article
Theoretical treatment of the second-order Raman scattering
The theoretical analysis for the Raman scattering by 2LO phonons is carried out. The scattering process is considered, taking into account the Wannier excitons and the free electron-hole pairs as intermediate ...
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Article
Multilayer x-ray mirrors based on W/B 4 C with ultrashort (d = 0.7–1.5 nm) periods
A method using resonance diffuse x-ray scattering has been developed to investigate the properties of multilayer structures composed of ultrathin films. Multilayer structures W/B 4 ...
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Article
Analysis of cross-correlation of interface roughness in multilayer structures with ultrashort periods
The diffusion scattering method is used for studying a series of W/B4C multilayer structures with ultrashort periods (d = 0.8–1.5 nm). A simple theoretical model is described; the model takes into account both th...
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Article
Theoretical investigation of the resonant hyper-Raman scattering by optical phonons
A theoretical model for the resonant hyper-Raman scattering in semiconductor crystals is presented. The Wannier excitons are considered as intermediate states. The expressions for the resonant hyper-Raman scat...
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Article
Multilayer optics for XUV spectral region: technology fabrication and applications
We present research investigations in the field of multilayer optics in X-ray and extreme ultra-violet ranges (XUV), aimed at the development of optical elements for applications in experiments in physics and ...
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Article
Interface Sensitive Investigation of 57Fe/Cr Superstructure by Means of Nuclear Resonance Standing Waves in Time Scale
With synchrotron pulsed radiation we have measured the time spectra of reflectivity for several grazing angles in vicinity of the Bragg peak for a microcrystalline periodical (Fe/Cr)26 multilayer. In such a way a...
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Article
Raman scattering of light by 2LO-phonons
A theory of resonance Raman scattering of light by 2LO-phonons in semiconductor crystals is presented. Wannier excitons are considered as intermediate states. Analytic expressions are obtained that take into acco...
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Article
Mössbauer reflectometry of multilayer structure Zr(10 nm)/[Cr(1.7 nm)/57Fe(1.6 nm)]26/Cr(50 nm) — comparative measurements in energy and time domains
It is shown that the nuclear resonance interaction strongly enhances the standing wave pattern formed in a multilayer structure at Bragg reflection. It is surprising that the amplitude of modulations increases...
