[en] It is supposed that the regeneration of the hydrated electrons is due to the optical excited of two-electron bound dimers with the next decay its on two hydrated electrons. In the framework of continual approximation of the adiabatic and strong coupling limit a scheme was developed for calculation of the ground state and the optical excitation spectrum of the bound state of two-electron dimer. The process leading to decay may consist of different steps and takes a number of alternative courses. It is shown that more probability are the next transitions:¹Σ_g(ls²)→¹Σ(ls2p_z) (wave length λ = 905 nm) and ¹Σ_g(ls²)→¹Π(ls2p_x±iy) (λ =877 nm). (author)

[en] There is a simple relationship between the radioprotective effectiveness of sulfurcontaining preparations and chemical structure of the compounds. It is established that the administration of the protector to the organism is just as effective as introduction of certain portion of information which should exceed some threshold for the effective radioprotectors

[en] It has been experimentally established that on photoexcitation of hydrogen-saturated alkali solution by light in the UV region of the spectrum, hydrated electrons were formed. As one would expect, disappearance of hydrated electrons occurred according to a second-order law. We supposed that the regeneration of the hydrated electrons is due to the optical excited of two-electron bound dimers with the next decay its on two hydrated electrons. One of the objectives of the present investigation was calculation of the electron excited states of the two-electron dimers. In the framework of continual approximation of the adiabatic and strong coupling limit a scheme was developed for calculations of the ground state and the optical excitation spectrum of the bound state of two-electron dimer. The process leading to decay may consist of different steps and takes a number of alternative courses. It is shown that probability are next transitions: sigma singlet state to sigma singlet state (wave length 905 nm) and sigma singlet state to pi singlet state (wave length 877 nm). In the first case the decay is going from intermediate triplet term. In the second case pi term is repulsive in all inter electron distances. We have studied both the ways that are considered to lead to the disruption of dimers. Both possibility supplement each other. This mechanism is real the conversion of two-electron dimers into two hydrated electrons. The experimental data agree with these theoretical results. (author)

[en] Within the framework of an informational approach and the statistical method of comparison of qualitative parameters a systematic factor is proposed, that is, the difference between entropy functions of hydrogen and carbon in the molecular structure that permits to reliably distinguish highly radioprotective agents among a series of drugs. A limiting factor (hydrophobicity) that restricts the manifestation of radioprotective properties of potential radioprptectors is considered. A relationship between toxic properties of the protective agents and their structure is discussed

[en] Molecular mechanisms of radioprotective action of some substituted indolylalkylamines are discussed in terms of the statistical correlation analysis. It was established that electron and steric properties of the substitutents are the factors influencing the radioprotective efficiency of these compounds. It was shown that the correlation obtained, relating the structure of the compounds to the radioprotective effect, may be applied in studies of the mechanism of action of the preparations and for the purposeful synthesis of new compounds

[en] Based on the Kramers-Henneberger operator transformation, the vibrational states of a singlet two-electron bound state are analyzed in the field of high-power nonresonance radiation. In the dipole approximation, the effect of an external field is shown to result in a monotonous decrease of the two-electron particle dissociation energy and reduction of the number of vibrational states. A critical value of the field is found when the vibrational spectrum disappears, and the dimer dissociates. (author)

[en] The possibility of spontaneous clustering of self-trapped electrons in an excited electronic state is discussed. The pair interaction potential corresponds to the excited terms ¹Σ_g(1s2s) in the single spin state and ³Σ_u(1s2s) in the triplet spin state. The energy interval corresponding to a pair of excited quasi-particles is calculated. Quantitative calculations are presented for electrons solvated in ammonia. 9 refs., 4 figs

[en] Numerous S-containing substances were used to study the radioprotective efficiency of the preparations depending on their microscopic characteristics. The method of statistical comparison of the qualitative parameters was used to show that the energy parameters were the most informative electron characteristics of the moleciles. Each of these parameters correlated with the physicochemical processes induced in a biological system by ionizing radiation. Quantitative estimates were made associatino. the protective efficiency of the substances under study with variations in the electron parameters

[en] The states of an autolocalized (solvated) electron in the field of an arbitrarily intense electromagnetic wave are analyzed. By using the Kramers-Henneberger unitary transformation, the rapidly oscillating perturbation is transported to the argument of a potential function. It is shown that the depth of the potential-energy well in which the electron is localized decreases monotonically with an increase in the strength of the external field. The analytic technique of a shifted 1/N expansion was used to express the position of the ground energy level as function of the external-source intensity. The critical value of a parameter characterizing the external source is found for which the ground bound quasi-discrete electron energy level vanishes. The localized-to-delocalized-state transition is identified as a diffuse nonmetal-metal phase transition. 9 refs., 2 figs

[en] Using the Bogolyubov-Tyablikov adiabatic approach, equations are derived describing the internal motion of electrons in a bipolaron and the relative motion of bipolarons with translational degeneracy taken into account. An analysis is given for the dependence of the binding energy and the bipolaron effective mass on the interpolaron separation and dielectric properties of a medium. The effects of interelectron correlation on the binding energy and the bipolaron effective mass are discussed. The limits are established for the ratio ε_s/ε_∞ within which the singlet bipolaron is stable. In deriving the form of an interpolaron potential, account is taken for the invariance of the system with respect to translations and rotations, reflections in space, and permutations of the electrons. The singlet-state bipolaron is shown to be an axisymmetric dimer, whereas in the electronically excited triplet state it is a quasiatomic central-symmetric compound. 28 refs., 6 figs