
Serg PozdneevP.N.Lebedev Physical Inst., Russian Academy of Sciences · Quntum Radiophysics Department, Laboratory of Photochemical Processes
Serg Pozdneev
Doctor of Engineering
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48
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Introduction
Skills and Expertise
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January 1984 - June 2015
P.N.Lebedev Physical Inst., Russian Academy of Sciences
Position
- Group Leader
Publications
Publications (48)
Several parameters (cross section, reaction rate, etc.) of various processes in laser, atomic, and chemical physics are calculated using quantum scattering theory for a system of a few particles. Results of the study of electronic and atomic collisions with diatomic molecules and collisions of diatomic molecules in excited rovibrational states are...
We describe the main features of the resonant scattering of electrons by molecules and calculate the parameters of the resonances within the framework of two different approaches: (1) the theory of collisions in a two-body system (where it is applicable); (2) the quantum theory of scattering in a fewbody system based on the Faddeev–Yakubovsky equat...
We describe the main features of resonances in scattering, determining the resonances in view of the theory of collisions in a two-body system, as well as the resonances emerging as a result of collisions in a few-body system. We analyze regularities in the emergence of such resonances and their characteristics. We discuss the results of calculatio...
A theoretical method to investigate cross sections of electron scattering for certain excited rovibrational states of diatomic
molecules by electron impact is proposed. This method is based on the treatment of the collision as a few-body process, using
quantum theory of scattering in few particles system. Comparison of the results of calculation of...
An analysis is made of the feasibility of increasing the spectral emission range of chemical lasers
utilizing electronic transitions. The chemical excitation processes are classified, the main kinetic
schemes of donor–acceptor lasers are discussed, and the laser efficiency is estimated. A new class
of reactions is proposed as a potential source of...
A new class of chemical lasers utilizing electronic transitions in atoms, radicals, or molecules
excited as a result of oxidation chain reactions in the presence of a catalyst is proposed and
analyzed. The possibilities for using these processes to achieve four lasing schemes are
discussed: directly due to transitions in excited intermediate produc...
A theoretical method is proposed for the investigation of the initial rovibrational exitation of Li2 molecule on the cross sections dissociative electron attachment. This method is based on the treatment of the collision as a three body processes, using quantum theory of scattering in few particle system. The results of the calculation of the cross...
A quantum theory of few-body scattering based on the Faddeev-Yakubovsky equations is applied to the calculation of cross sections of electron and atom scattering by diatomic molecules in specified excited rovibrational states. The results of the calculations are compared with the available experimental data and other calculations.
The main features of resonance scattering of electrons by molecules are described and resonances are determined on the basis
of the theory of collisions in a two-body system, as well as resonances emerging as a result of collisions in a few-body system.
Regularities in the emergence of such resonances and their characteristics are analyzed. The res...
Using the three‐body approximation with the well‐known interatomic potential, the Efimov states in molecular systems are calculated.
A mechanism of appearance and dissappearance of the Efimov states in the helium trimer in the three‐body approximation is
considered when the interatomic‐interaction force is varied. Geometrical structure of these unu...
Three-body eikonal approximation is applied to calculate charge-transfer and ionization processes. The results of calculation
are compared with available experimental data and the calculation based on the quasiclassical (adiabatic) approximation, as
well as with the rigorous three-body, quantum-mechanical calculation.
Results are presented of calculations of cross sections for scattering of electrons by diatomic molecules in specific excited
vibrational-rotational states. The calculations were made using an approximation based on a quantum theory of scattering in
a system of several bodies which can be applied to calculations of direct reactions and reactions in...
A method based on the quantum-mechanical theory of collisions in a three-body system is used to calculate the cross sections
of the dissociative attachment of electrons to sodium molecules that are in the rovibrational-excited states. The results
of calculations are compared to the available experimental data and the published results of other calc...
A rigorous formalism appropriate for the description of three-body scattering processes with charged particles is described. It is based on the three-body modified Faddeev equation in configuration space with boundary conditions. A numerical method for solving these equations is described. It is applied to proton-deuteron elastic scattering and bre...
A method is proposed for calculating the cross sections of the collision processes of elastic scattering, vibrational excitation, dissociation and dissociative attachment in electron scattering with an initially vibrationally excited nitrogen molecule. The method is based on the treatment of the collision as a three-body process, using Faddeev equa...
The dissociative attachment is treated as a three-body rearrangement process. The interaction of the electron with the molecule is replaced approximately by the interaction with each of the atoms as if they are simple field centres. Faddeev (1960) equations are used to calculate the cross section. The interaction of the electron with the atom is re...
The quantum theory of few-body scattering based on Faddeev-Yakubovsky integral and differential equations is applied to calculations of various processes (elastic, inelastic, atom exchange, and dissociative) in nuclear, atomic, and molecular physics. Analytical solutions of these equations are presented for various limiting cases. The methods used...
The classical model proposed by Ostrovsky [j. Phys., B28, 3901 (1995)] is applied to the calculation of charge-transfer cross sections for H+(D+)+HCl→H(D)+HCl+ and O++Xe→O+Xe+ reactions. The results of calculation are compared with available experimental data and classical trajectory Monte Carlo
calculation.
The differential angular cross section for single ionization of He in collisions with H+, D+, and T+ has been calculated within the framework of the three-body approximation. The results of the calculations of the angular
distribution of H+, D+, and T+ are compared with the available experimental and calculational data.
Methods are suggested for calculating interatomic potentials of ground and electronically excited states of the diatomic systems. The calculations of potential energy curves of the hydrogen, helium, rare gases and their ions are presented.
A new class of chemical lasers based on electronic transitions of atoms, radicals, or molecules excited via oxidation chain reactions in the presence of catalysts is proposed and discussed. The possibility is considered of using these processes to realize four lasing schemes: directly via transitions of excited intermediate products, in an exchange...
Stimulated coherent scattering of an electromagnetic wave by a relativistic electron beam is investigated in the framework of the three-wave approximation for the case of noncollinear geometry, when both the incident and scattered waves can propagate at an arbitrary angle to the beam direction. A dispersion equation is derived with which the collec...
Comparative characteristics and possible applications of widespread types of dialogue monitors functioning in operating systems of ES computers are studied (RRV, DUVZ, RIM, KDO, OKO, FOKUS, PRIMUS, TERM, VEKTOR, JACK, REGUL-M, DED, JESSY). A dialogue adjustment subsystem (PDO) is described which operates under the control of a system of virtual mac...
The quantum theory of many-body scattering based on the Faddeev-Yakubovsky equations is applied to the calcuation of the simplest chemical reactions (collisions of electrons with ro-vibrational diatomic molecules (H2, HD, D2, Cl2, Br2, I2, HCl, HBr, N2), atoms with two- and three-atom molecules (H+H2, H+H, O+CS, S+O2, O+O2, O+N2, O+CS2, O+OCS), and...
Cluster approximation from the quantum scattering theory in a system of three bodies is used to calculate the cross sections of chemical reactions - dissociative adherence of an electron to hydrogen molecules and their isotropic analogs and the exchange chemical reaction of O plus CF//3I yields IO plus CF//3. The results of the calculations are com...
A phase shifts analysis for neutron-deuteron and proton-deuteron scattering is made at three-body threshold using the Faddeev equation in configuration space.
The cross sections for the dissociative attachment of electrons to hydrogen halide molecules are calculated in the multiple-scattering approximation in a three-body system. The calculations are carried out using modified Faddeev equations for three charged particles. The results are compared with experimental data.
By using the picture of multiple scattering in a three-body system, the dissociation of Nâ into N and Nâ» is discussed.(AIP)
The Faddeev equations have been used to calculate the total and differential cross sections for the dissociative attachment of an electron to H/sub 2/, HD, and D/sub 2/ molecules (e+AB..-->..A/sup -/+B). The adiabatic approximation (at electron energies above the threshold for the dissociation of the molecule to the free atoms A+B) and the approxim...
The total and differential cross sections of dissociative attachment of an electron (e + AB yields A- + B) to H2, HD, and D2 molecules are calculated by using the Faddeev (1960) equation. This equation was solved in an adiabatic approximation, where the electron energy was higher than the threshold of dissociation of the molecule into free atoms, a...
The Efimov effect in scattering of three particles is investigated for scattering of a neutron by a deutron. The Faddeev differential equation is used, and the potential is taken in the form of a sum of two exponentials. It is shown that there is a nonmonotonic dependence of the elastic doublet S-wave scattering phase shift on the neutron energy, t...
A method is proposed for numerically solving the three-body problem in the boundary condition model. The binding energies and scattering phases are calculated for three identical particles; the scattering characteristics are calculated for the first time in the boundary condition model. The results obtained are in good agreement with the experiment...
The binding energies and the scattering states of three particles are calculated in the case when the pair interactions between the particles includes the Coulomb interaction in addition to the short-range potential.
Chemical excitation processes are classified, basic kinetic schemes of donor-acceptor lasers are discussed, and laser efficiency is estimated. A new class of reactions which are a potential source of electron-excited nitrogen molecules for short-wave chemical lasers is presented. Various types of chemical processes beginning with the generation of...