Parameters of a microrelief of poly(ethyleneterephthalate) (PET) 0.7 mm thick and poly(methylmethacrylate) (PMMA) 1.0 min thick films with a hard platinum covering are studied. The technology of manufacturing the PET substrates with the microrelief is optimized. The birefringence and transmission of the substrates in dependence on their elongation are measured. The possibility of their use as diffraction gratings, scattering and other optical elements for displays is discussed.
The process of multilayer assembly via layer-by-layer deposition of linear polyions and lysozyme have been studied. The films were fabricated on glass slides by alternate electrostatic adsorption of anionic poly(styrenesulfonate) (PSS), cationic poly(allylamine) (PAA) polyions and hen egg-white lysozyme. The multilayer build-up was monitored by the small-angle X-ray diffraction method. X-ray reflectivity curves from the films measured at different steps of the assembly reveal Kiessig fringes. From their periodicity the film thickness was calculated. The growth step for a PSS/PAA bilayer equals 37 Å. The thickness of the lysozyme layer equals 45 Å, which is close to dimensions of the lysozyme molecule determined by X-ray crystallography. An analysis of surface charges of the lysozyme molecule shows some preferentially positive charged regions, which are the most probable sites of interactions with negatively charged PSS.
We study a possible explanation of the tensor currents in the weak radiative pi- --> e--nu(e)gamma-BAR decay which was suggested recently by Bolotovet al. [Phys. Lett. B 243 (1990) 308] and Poblaguev [Phys. Lett. B 238 (1990) 108]. It can be shown that the supersymmetric particles can produce a tensor coupling at order (10(-4)-10(-5)) G(F) which is 2-3 orders of magnitude smaller than the estimates extracted from the experimental data. A reliable calculation of the hadronic matrix element [pi\u-sigma(mu-nu)dBAR\gamma] is done. The importance of a precision measurement of the tensor coupling in this decay is discussed as well as the possible relevance of the technicolour models.
