Investigations in the acridine series

Condensation of 9-chloroacridines with substituted phenols has given a series of strongly bactericidal 9-phenoxyacridines, which have not previously been described in the literature.     

Microwave EPR spectroscopy of cobalt-doped germanium cuprate

Resonance magnetoabsorption spectra of CuGeO₃ single crystals containing 2% Co impurity have been studied in the frequency range 60–360 GHz in magnetic fields of up to 16 T and in the temperature interval 2–60 K with the magnetic field B aligned parallel to the a crystallographic axis. In addition to the Cu²⁺ chain resonance, a new absorption line (unobserved previously in doped CuGeO₃ and deriving apparently from the Co²⁺ ions) was detected in EPR spectra. Quantitative analysis of the spectra suggests that the spin-Peierls transition occurs in about 10% Cu²⁺ chains, while the spin-Peierls state in the remaining 90% chains is completely destroyed by cobalt doping. The results obtained reveal considerable deviations from the universally accepted scenario of CuGeO₃ doping and are discussed within alternative theoretical models, namely, the quantum critical behavior (based on the EPR theory for quasi-one-dimensional systems) and a three-dimensional antiferromagnet with the Néel temperature lowered by disorder.     

Anomalous hall effect in HoB12

Within a wide temperature range of 1.8–300 K, the Hall effect in holmium dodecaboride is investigated. The measurements of the angular dependences of the Hall resistance ρ_H(φ, T, H) for HoB₁₂ performed in a high magnetic field up to 80 kOe at helium and intermediate temperatures made it possible to separate the normal and anomalous contributions to the Hall effect. Analysis of the anomalous component behavior in the paramagnetic and Néel phases suggests the appearance of the 5d-state magnetic polarization (the spin polaron effect) and makes it possible to compare the revealed features of the Hall coefficient R _H(T, H) with the H-T magnetic phase diagram of HoB₁₂. Original Russian Text ? N.E. Sluchanko, D.N. Sluchanko, V.V. Glushkov, S.V. Demishev, N.A. Samarin, N.Yu. Shitsevalova, 2007, published in Pis’ma v Zhurnal éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 86, No. 9, pp. 691–694.     

A self-consistent shell model of atomic nuclei and two-nucleus systems

A shell model with the potential energy of nucleons depending nonlinearly on the nucleon concentration is proposed. The iterative scheme for solving the problem converges and ensures the similarity of theoretical and experimental root-mean-square radii of atomic nuclei.     

Optoacoustical studies in the spectral range 9–11μm of the absorption coefficients of aerosols originating from soils

A laser optoacoustic resonance spectrometer is described, and the results are given from a study of the radiation absorption coefficients for a number of aerosol samples in the suspended state.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 6–10, April, 1982.     

Nucleon states of strongly deformed nuclei and dinuclear systems in the nonoscillator two-center model

A new method for numerically solving the Schrö dinger equation for an arbitrary axisymmetric field with allowance for spin-orbit interaction is used to study neutron and proton states in strongly deformed nuclei and dinuclear systems produced at the first step of the fusion of nuclei. A quadrupole-octupole parametrization is proposed for the shape of a dinuclear system and for the potential energy of nucleons in this system. The experimentally observed deformations of the ^26,27,28Mg nuclei and the difference in the cross sections for the fusion of nuclei in the ¹⁸O + ⁵⁸Ni and ¹⁶O + ⁶⁰Ni systems are explained qualitatively.     

Study of ground states of <Superscript>3,4,6</Superscript>He nuclides by Feynman’s continual integrals method

The energy and the square modulus of the wave function for the ground states of helium nuclides ^3,4,6He has been calculated by Feynman’s continual integrals method. A new parameterization of the shell model for light nuclei is proposed.