The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
S.a. Uryupin - One of the best experts on this subject based on the ideXlab platform.
-
High-frequency waves in plasma formed as a result of tunnel ionization of atoms by circularly Polarized Radiation
Physics Letters A, 2017Co-Authors: K. Yu. Vagin, T. V. Mamontova, S.a. UryupinAbstract:Abstract New dependencies of frequency and damping decrement of high-frequency longitudinal waves on the wave vector in photoionized plasma formed by tunnel ionization of atoms in the field of circularly Polarized Radiation are found. Weakly damped longitudinal waves with a frequency much higher than the electron Langmuir frequency are predicted.
-
Electron modes of plasma generated at tunnel ionization of atoms by a circularly Polarized Radiation
Physics of Plasmas, 2017Co-Authors: K. Yu. Vagin, S.a. UryupinAbstract:The collective modes of photoionized plasmas are studied using the model description of electron velocity distribution formed at tunnel ionization of atoms by circularly Polarized Radiation. The dispersion laws of transverse and approximately longitudinal high-frequency waves propagating at an arbitrary angle to the anisotropy axis of photoelectron distribution are obtained. The dispersion law of potential surface waves is derived. It is shown that the frequency of these waves may be greater than plasma frequency. The aperiodic instability of photoionized plasmas is described.
Juri Poutanen - One of the best experts on this subject based on the ideXlab platform.
-
Relativistic kinetic equation for Compton scattering of Polarized Radiation in a strong magnetic field
Physical Review D, 2012Co-Authors: Alexander A. Mushtukov, Dmitrij I. Nagirner, Juri PoutanenAbstract:We derive the relativistic kinetic equation for Compton scattering of Polarized Radiation in strong magnetic field using the Bogolyubov method. The induced scattering and the Pauli exclusion principle are taken into account. The electron polarization is also considered in the general form of the kinetic equation. The special forms of the equation for the cases of the non-Polarized electrons, the rarefied electron gas and the two polarization mode description of Radiation are found. The derived equations are valid for any photon and electron energies and the magnetic field strength below about 10^{16} G. These equations provide the basis for formulation of the equation for Polarized Radiation transport in atmospheres and magnetospheres of strongly magnetized neutron stars.
-
Relativistic kinetic equation for induced Compton scattering of Polarized Radiation
Astronomy & Astrophysics, 2001Co-Authors: Dmitrij I. Nagirner, Juri PoutanenAbstract:The relativistic kinetic equations describing time evolution and space dependence of the density matrices of Polarized photons and electrons interacting via Compton scattering are deduced from the quantum Liouville equation. The induced scattering and exclusion principle are taken into account. The Bogoliubov method is used in the frame of quantum electrodynamics. The equation for Polarized Radiation scattered by unPolarized electrons is considered as a particular case and is reformulated in terms of the Stokes parameters. The expressions for the scattering amplitudes and cross-sections are derived simultaneously.
K. Yu. Vagin - One of the best experts on this subject based on the ideXlab platform.
-
High-frequency waves in plasma formed as a result of tunnel ionization of atoms by circularly Polarized Radiation
Physics Letters A, 2017Co-Authors: K. Yu. Vagin, T. V. Mamontova, S.a. UryupinAbstract:Abstract New dependencies of frequency and damping decrement of high-frequency longitudinal waves on the wave vector in photoionized plasma formed by tunnel ionization of atoms in the field of circularly Polarized Radiation are found. Weakly damped longitudinal waves with a frequency much higher than the electron Langmuir frequency are predicted.
-
Electron modes of plasma generated at tunnel ionization of atoms by a circularly Polarized Radiation
Physics of Plasmas, 2017Co-Authors: K. Yu. Vagin, S.a. UryupinAbstract:The collective modes of photoionized plasmas are studied using the model description of electron velocity distribution formed at tunnel ionization of atoms by circularly Polarized Radiation. The dispersion laws of transverse and approximately longitudinal high-frequency waves propagating at an arbitrary angle to the anisotropy axis of photoelectron distribution are obtained. The dispersion law of potential surface waves is derived. It is shown that the frequency of these waves may be greater than plasma frequency. The aperiodic instability of photoionized plasmas is described.
J. Freimanis - One of the best experts on this subject based on the ideXlab platform.
-
On Green's function for cylindrically symmetric fields of Polarized Radiation
Journal of Quantitative Spectroscopy & Radiative Transfer, 2009Co-Authors: J. FreimanisAbstract:Analytic expressions for Green's function describing the process of transfer of Polarized Radiation in homogeneous isotropic infinite medium in case of cylindrical symmetry and nonconservative scattering are obtained. The solution is based on the set of systems of Abel integral equations of the first kind obtained using the principle of superposition, and the known expression of Green's function for Radiation fields with plane-parallel symmetry. Eigenvalue decompositions for the corresponding matrices of generalized spherical functions are found. Using this result the systems of Abel integral equations are diagonalized, and the final solution is obtained.
-
On Green's function for spherically symmetric problems of transfer of Polarized Radiation
Journal of Quantitative Spectroscopy & Radiative Transfer, 2005Co-Authors: J. FreimanisAbstract:Analytic expressions for Green's function describing the process of transfer of Polarized Radiation in homogeneous isotropic infinite medium in case of spherical symmetry and nonconservative scattering are obtained. Spherical eigenfunctions of the homogeneous transfer equation are not used, due to their strong divergence; instead, direct transformation from plane-parallel to spherical symmetry is carried out, leading to convergent solutions. The possible existence of generalized eigenfunctions of homogeneous transfer equation is accounted for.
Dmitrij I. Nagirner - One of the best experts on this subject based on the ideXlab platform.
-
Relativistic kinetic equation for Compton scattering of Polarized Radiation in a strong magnetic field
Physical Review D, 2012Co-Authors: Alexander A. Mushtukov, Dmitrij I. Nagirner, Juri PoutanenAbstract:We derive the relativistic kinetic equation for Compton scattering of Polarized Radiation in strong magnetic field using the Bogolyubov method. The induced scattering and the Pauli exclusion principle are taken into account. The electron polarization is also considered in the general form of the kinetic equation. The special forms of the equation for the cases of the non-Polarized electrons, the rarefied electron gas and the two polarization mode description of Radiation are found. The derived equations are valid for any photon and electron energies and the magnetic field strength below about 10^{16} G. These equations provide the basis for formulation of the equation for Polarized Radiation transport in atmospheres and magnetospheres of strongly magnetized neutron stars.
-
Relativistic kinetic equation for induced Compton scattering of Polarized Radiation
Astronomy & Astrophysics, 2001Co-Authors: Dmitrij I. Nagirner, Juri PoutanenAbstract:The relativistic kinetic equations describing time evolution and space dependence of the density matrices of Polarized photons and electrons interacting via Compton scattering are deduced from the quantum Liouville equation. The induced scattering and exclusion principle are taken into account. The Bogoliubov method is used in the frame of quantum electrodynamics. The equation for Polarized Radiation scattered by unPolarized electrons is considered as a particular case and is reformulated in terms of the Stokes parameters. The expressions for the scattering amplitudes and cross-sections are derived simultaneously.