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S A Yakovleva – One of the best experts on this subject based on the ideXlab platform.

  • estimating inelastic heavy Particle hydrogen collision data ii simplified model for ionic collisions and application to barium hydrogen ionic collisions
    Astronomy and Astrophysics, 2017
    Co-Authors: A K Belyaev, S A Yakovleva

    Abstract:

    Aims. A simplified model is derived for estimating rate coefficients for inelastic processes in low-energy collisions of heavy Particles with hydrogen, in particular, the rate coefficients with high and moderate values. Such processes are important for non-local thermodynamic equilibrium modeling of cool stellar atmospheres. Methods. The derived method is based on the asymptotic approach for electronic structure calculations and the Landau-Zener model for nonadiabatic transition probability determination. Results. It is found that the rate coefficients are expressed via statistical probabilities and reduced rate coefficients. It is shown that the reduced rate coefficients for neutralization and ion-pair formation processes depend on single electronic bound energies of an Atomic Particle, while the reduced rate coefficients for excitation and de-excitation processes depend on two electronic bound energies. The reduced rate coefficients are calculated and tabulated as functions of electronic bound energies. The derived model is applied to barium-hydrogen ionic collisions. For the first time, rate coefficients are evaluated for inelastic processes in Ba + + H and Ba 2+ + H − collisions for all transitions between the states from the ground and up to and including the ionic state.

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A K Belyaev – One of the best experts on this subject based on the ideXlab platform.

  • estimating inelastic heavy Particle hydrogen collision data ii simplified model for ionic collisions and application to barium hydrogen ionic collisions
    Astronomy and Astrophysics, 2017
    Co-Authors: A K Belyaev, S A Yakovleva

    Abstract:

    Aims. A simplified model is derived for estimating rate coefficients for inelastic processes in low-energy collisions of heavy Particles with hydrogen, in particular, the rate coefficients with high and moderate values. Such processes are important for non-local thermodynamic equilibrium modeling of cool stellar atmospheres. Methods. The derived method is based on the asymptotic approach for electronic structure calculations and the Landau-Zener model for nonadiabatic transition probability determination. Results. It is found that the rate coefficients are expressed via statistical probabilities and reduced rate coefficients. It is shown that the reduced rate coefficients for neutralization and ion-pair formation processes depend on single electronic bound energies of an Atomic Particle, while the reduced rate coefficients for excitation and de-excitation processes depend on two electronic bound energies. The reduced rate coefficients are calculated and tabulated as functions of electronic bound energies. The derived model is applied to barium-hydrogen ionic collisions. For the first time, rate coefficients are evaluated for inelastic processes in Ba + + H and Ba 2+ + H − collisions for all transitions between the states from the ground and up to and including the ionic state.

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E. K. Gol – One of the best experts on this subject based on the ideXlab platform.

  • Quasihard-Sphere Model in Simulation of the Processes of Particle Scattering
    , 2000
    Co-Authors: V. A. Vol, E. K. Gol

    Abstract:

    A model of interAtomic potentials of interaction is suggested for static simulation of the processes of elastic scattering of Atomic Particles by atoms of gas, plasma, and solid. In the developed model, the Atomic Particle radii, whose magnitude depends on the energy of their relative motion, are internal parameters. The sug- gested quasihard-sphere model enables one to simulate elastic processes of scattering of Atomic Particles, using different interAtomic potentials of interaction with relatively high rates of statistical simulation characteristic of simulation within the hard-sphere model. The Born-Mayer potential is selected as the interAtomic potential of interaction and modified for a wide class of partners in Atomic collisions. It is demonstrated that the suggested mathematical model of quasihard spheres describes fairly correctly the processes of elastic scattering of atoms in a gas medium and of displaced atoms in a solid with an almost constant rate of static simulation. © 2000 MAIK “Nauka/Interperiodica”.

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