Spectroscopic Diagnostic of the Peripheral Plasma in the Globus-M2 Tokamak with the Injection of Neutral Helium

JETP Letters - The diagnostic of the peripheral plasma parameters in terms of the relation of lines of neutral helium is included in the diagnostic complex of the tokamak Globus-M2. The first...     

Second-harmonic interferometric spectroscopy of buried interfaces of column IV semiconductors

The technique of combined optical second-harmonic (SH) intensity and phase spectroscopy, which is the spectroscopic modification of SH phase measurements, is proposed to study the nonlinear optical response of semiconductor interfaces with spectrally close resonant contributions. The spectral dependences of SH intensity and phase from oxidised Si (111) and Ge (111) surfaces are studied in the range of 3.5- to 5-eV SH photon energy. The resonant behaviour of combined SH spectra is associated with a superposition of contributions from direct interband transitions at several critical points of Si and Ge band structures. Received: 16 October 2001 / Revised version: 16 April 2002 / Published online: 6 June 2002     

Anisotropic photonic crystals and microcavities based on mesoporous silicon

A technique to prepare one-dimensional anisotropic photonic crystals and microcavities based on anisotropic porous silicon exhibiting optical birefringence has been developed. Reflectance spectra demonstrate the existence of a photonic band gap and of an allowed microcavity mode at the photonic band gap center. The spectral position of these bands changes under rotation of the sample about its normal and/or under rotation of the plane of polarization of the incident radiation. The dependence of the shift of the spectral position of the photonic band gap edges and of the microcavity mode on the orientation of the polarization vector of incident electromagnetic wave with respect to the optical axis of the photonic crystals and microcavities was studied.     

Metallocenic thioketones as two-electron ligands.: IV. E–Z isomerization of cymantrene derivatives with an arylcymantrenyl phenyl thioketone ligand

The ¹H NMR spectra of binuclear complexes of transition metals with cymantrenyl aryl thioketones have been studied. Temperature-dependence of the ¹H NMR spectra of these complexes indicates that the rotation about the C bond is restricted. The energetic parameters for this process have been determined.     

Mesoporous PET-Based Materials with Closed Porosity and Gas-Separating Properties

Russian Journal of General Chemistry - An approach to prepare highly porous polymeric material with continuous-solid surface layer (closed porosity) has been elaborated. The materials exhibiting...     

Strain-induced fibrillation of glassy polymers

Literature data on structural rearrangements taking place in amorphous glassy polymers upon their plastic deformation are analyzed. This deformation is shown to be primarily accompanied by polymer self-dispersion into fibrillar aggregates composed of oriented macromolecules with a diameter of 1—10 nm. The above structural rearrangements proceed independently of the deformation mode of polymers (cold drawing, crazing, or shear banding of polymers under the conditions of uniaxial drawing or uniaxial compression). Principal characteristics of the formed fibrils and the conditions providing their development are considered. Information on the properties of the fibrillated glassy polymers is presented, and the pathways of their possible practical application are highlighted.     

Structure and Complexing Properties of Butyl [(N-Benzyl-N,N-dibutylammonio)methyl] Phosphonate

Russian Journal of General Chemistry - Complexes of phosphorylated betaine, butyl [(N-benzyl-N,N-dibutylammonio)methyl] phosphonate, were studied by IR spectrometry, which, according to X-ray...     

First 97Ru complex with pyridine-2,6-dicarboxamide conjugate for potential use as radiopharmaceutical

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Localized-to-propagating surface plasmon transitions in gold nanoslit gratings

Plasmon polaritons in thin gold nanoslit gratings with a fixed period and a variable filling factor are studied using microspectroscopy measurements and finite-difference time-domain simulations. The regimes of surface plasmon polaritons, localized plasmons, and the mixed mode are identified.     

The role of the scale factor in the structure-related mechanical behavior of glassy polymers

Literature data on the effect of the scale factor on the structure and properties of polymers have been analyzed. Two modes of the scale factor have been revealed. The first mode is related to the sizes of a polymer phase. This factor manifests itself when the polymer phase sizes become comparable with the sizes of a macromolecular coil. The second mode is directly associated with the sizes of a polymer sample and becomes detectable when investigating bulky polymer samples. The scale factor has been shown to substantially affect the structure-related mechanical behavior of loaded polymers, in particular, the stress–strain curves characterizing glassy polymers.