Masa-aki Sato

Electrochemical preparation of highly conducting polythiophene films

Electrochemical polymerization of thiophene, 3-methylthiophene, and 3-ethylthiophene in propylene carbonate gave tough films, having conductivities of 190, 510, and 270 S cm–1, respectively.

ESR studies on the dimer formation between copper ions in the poly(vinylimidazole) · copper(II) complex

SummaryESR studies were made on the poly (vinylimidazole)· copper(II) complex in a lower magnetic field near 1600 gauss. The absorption in this region was observed for the poly(vinylimidazole) · copper (II) complex system while no absorption was present for the imidazole· copper (II) complex. The result was interpreted in terms of the dipolar interaction between copper (II) ions in the polymeric complex system, where the copper (II) ions were put together on the polymeric ligand in a highly condensed state.

Functional Monomers and Polymers. LX. Effects of Counterions on the Structure of Cu(II)-Polyvinylimidazole and Cu(II)lmidazole Complexes in Aqueous Solution

Abstract The effect of counterion types on the structure of Cu(II) complexes of imidazole and poly-4(5)-vinylimidazole in aqueous solution was studied by spectroscopic and electron spin resonance (ESR) techniques. Visible and ESR spectra of both complexes in aqueous solution containing NaClO4, KNO3, KC1, and KBr showed only a slight change from each other in the presence of different counterions. On the other hand, the frequency of the center of absorption band in the visible region (λmax) and ESR parameters of the complex in aqueous solution did not correspond to those reported for its crystalline state, and in addition, those of the polymeric Cu(II) complex were different from those of the low molecular weight Cu(II) complex. It was proposed that in aqueous solution, water molecules are coordinated to the axial position of the complex where counterion molecules are present in the crystalline state, and that the structure of the polymeric Cu(II) complex is different from that of the low molecular weight ...

Meson mass spectra in the quark-string model

Abstract Old and new meson spectra are studied from a unified view point based on the quark-string lagrangian which has been derived from a continuum limit of the lattice gauge theory. Calculated values for c c states agree with observed values within a few percent error. The ψ → η c γ process is discussed.

Variational methods in the master field formulation for (3+1)-dimensional quantum chromodynamics

Master fields are formulated for finite-N (3+1)-dimensional QCD. They satisfy classical Yang-Mills equations with an infinite number of internal indices and an infinite number of constraints. Master fields and constraints on them in the large-N limit (N..-->..infinity with fixed g/sup 2/N) are derived from the finite-N master fields and constraints using vacuum dominance among color-singlet states. Explicit solutions for the large-N constraints are given and used as trial functions in a Hartree-Fock variational calculation. This Hartree-Fock method can include essential features of gluon condensation effects in the QCD/sub 3//sub +/1 vacuum which is expected to cause confinement. Inclusion of quark fields and Hartree-Fock equations for the meson energy spectrum are also discussed.

A Semiclassical Approach to the Boson-Fermion System

A full semiclassical approximation (WKB) method for the boson-fermion system is formulated in terms of local effective actions with auxiliary fields. The method is usdul for spectrum analysis of the system in which ferrnions (anti-commuting coordinates) are strongly coupled with bosons (commuting coordinates). The Gross- Neveu model is studied by this method.