Amplification of an electromagnetic field at the scattering of the nonrelativistic electron by an ion in the external field of medium intensity for an arbitrary angle of the initial electron

Laser Physics ◽  
2014 ◽  
Vol 24 (8) ◽  
pp. 086004
Author(s):  
V A Tsybul’nik ◽  
S P Roshchupkin
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Arbitrary Angle ◽  
Nonrelativistic Electron ◽  
Initial Electron ◽  
Medium Intensity

scholarly journals Derivative expansion for the one-loop effective Lagrangian in QED

1996 ◽  
Vol 74 (5-6) ◽  
pp. 282-289 ◽  
Author(s):  
V. P. Gusynin ◽  
I. A. Shovkovy
Keyword(s):  
Electromagnetic Field ◽  
Field Strength ◽  
External Field ◽  
Explicit Expression ◽  
Derivative Expansion ◽  
Effective Lagrangian ◽  
Constant Electromagnetic Field ◽  
The One ◽  
Derivatives Of

The derivative expansion of the one-loop effective Lagrangian in QED4 is considered. The first term in such an expansion is the famous Schwinger result for a constant electromagnetic field. In this paper we give an explicit expression for the next term containing two derivatives of the field strength Fμν. The results are presented for both fermion and scalar electrodynamics. Some possible applications of an inhomogeneous external field are pointed out.

Resonant production of electron-positron pairs by a hard gamma-ray on a nucleus in an external electromagnetic field

2020 ◽  
Vol 35 (03) ◽  
pp. 2040025 ◽  
Author(s):  
Nikita R. Larin ◽  
Victor V. Dubov ◽  
Sergei P. Roshchupkin
Keyword(s):  
Electromagnetic Field ◽  
Differential Cross Section ◽  
External Field ◽  
Cross Section ◽  
Differential Cross ◽  
Gamma Ray ◽  
Structure Constant ◽  
External Electromagnetic Field ◽  
Electron Positron ◽  
Resonant Production

The resonant production of electron-positron pairs by a hard gamma-ray on nucleus in an external electromagnetic field is studied theoretically. The main property of this process is that the initial process of the second order in the fine structure constant in an external field effectively splits into two successive processes of the first order due to the fact that in resonant conditions intermediate virtual electron (positron) becomes a real particle. One of these processes is a single-photoproduction of electron-positron pair in a laser field (laser-stimulated Breit-Wheeler process) another is a laser-assisted scattering of electron (positron) on nucleus (laser-assisted Mott scattering). It is shown that the resonances are possible only for the energies of the initial hard gamma-ray more than the characteristic threshold energy. Resonant differential cross section of this process is obtained. It is shown that the resonant differential cross section can significantly exceed the corresponding cross section without an external field. The obtained results may be experimentally verified using the facilities of pulsed laser radiation (SLAC, FAIR, XFEL, ELI, XCELS).

Local electric fields and molecular properties in heterogeneous environments through polarizable embedding

2016 ◽  
Vol 18 (15) ◽  
pp. 10070-10080 ◽  
Author(s):  
Nanna Holmgaard List ◽  
Hans Jørgen Aagaard Jensen ◽  
Jacob Kongsted
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Electric Fields ◽  
Molecular Properties ◽  
Heterogeneous Environments ◽  
Field Effects ◽  
Polarizable Embedding

Effective external field effects in spectroscopies of molecules in heterogeneous environments, i.e., the implications of the additional environment polarization induced by the probing electromagnetic field, can be significant and depart remarkably from the simple Onsager picture.

scholarly journals Penetration of non-uniform electromagnetic field into conducting body

2021 ◽  
pp. 43-53
Author(s):  
Yu. M. Vasetsky
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Small Parameter ◽  
Penetration Depth ◽  
Half Space ◽  
Skin Effect ◽  
Asymptotic Series ◽  
Uniform Field ◽  
Impedance Boundary ◽  
Uniform Electromagnetic Field

The study is based on the exact analytical solution for the general conjugation problem of three-dimensional quasi-stationary field at a flat interface between dielectric and conducting media. It is determined that non-uniform electromagnetic field always decreases in depth faster than uniform field. The theoretical conclusion is confirmed by comparing the results of analytical and numerical calculations. The concept of strong skin effect is extended to the case when penetration depth is small not only compare to the characteristic body size, but also when the ratio of the penetration depth to the distance from the surface of body to the sources of the external field is small parameter. For strong skin effect in its extended interpretation, the influence of external field non-uniformity to electromagnetic field formation both at the interface between dielectric and conducting media and to the law of decrease field in conducting half-space is analyzed. It is shown, at the interface the expressions for the electric and magnetic intensities in the form of asymptotic series in addition to local field values of external sources contain their derivatives with respect to the coordinate perpendicular to the interface. The found expressions made it possible to generalize the approximate Leontovich impedance boundary condition for diffusion of non-uniform field into conducting half-space. The difference between the penetration law for the non-uniform field and the uniform one takes place in the terms of the asymptotic series proportional to the small parameter to the second power and to the second derivative with respect to the vertical coordinate from the external magnetic field intensity at the interface.

scholarly journals Penetration of an external field change with arbitrary angle into a saturated superconducting filament

2002 ◽  
Vol 372-376 ◽  
pp. 1356-1359 ◽  
Author(s):  
M Haverkamp ◽  
B ten Haken ◽  
L Bottura ◽  
H.H.J ten Kate
Keyword(s):  
External Field ◽  
Field Change ◽  
Arbitrary Angle

Electrodynamics and Propagation of a Spin 3/2 Field

1974 ◽  
Vol 52 (10) ◽  
pp. 919-920 ◽  
Author(s):  
A. Z. Capri ◽  
A. Shamaly
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Special Relativity ◽  
External Electromagnetic Field

We show that if a charged Rarita–Schwinger spin 3/2 field is coupled both to an internal as well as external electromagnetic field, acausal propagation will always occur regardless of the external field. Thus the electrodynamics of a Rarita–Schwinger spin 3/2 field is not consistent with special relativity.

scholarly journals Large N external-field quantum electrodynamics

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Felix Karbstein
Keyword(s):  
Electromagnetic Field ◽  
External Field ◽  
Effective Action ◽  
Quantum Electrodynamics ◽  
Strong Field ◽  
Loop Order ◽  
Field Limit ◽  
Effective Lagrangian ◽  
Large N ◽  
The One

Abstract We advocate the study of external-field quantum electrodynamics with N charged particle flavors. Our main focus is on the Heisenberg-Euler effective action for this theory in the large N limit which receives contributions from all loop orders. The contributions beyond one loop stem from one-particle reducible diagrams. We show that specifically in constant electromagnetic fields the latter are generated by the one-loop Heisenberg-Euler effective Lagrangian. Hence, in this case the large N Heisenberg-Euler effective action can be determined explicitly at any desired loop order. We demonstrate that further analytical insights are possible for electric-and magnetic-like field configurations characterized by the vanishing of one of the secular invariants of the electromagnetic field and work out the all-orders strong field limit of the theory.

scholarly journals On Induction Heating - Conductor Excited by External Field

2013 ◽  
Vol 64 (4) ◽  
pp. 261-264
Author(s):  
Jaroslav Franek
Keyword(s):  
Electromagnetic Field ◽  
Wave Equation ◽  
External Field ◽  
Poynting Vector ◽  
Induced Current ◽  
Strip Conductor ◽  
Inhomogeneous Wave ◽  
Inhomogeneous Wave Equation ◽  
Symmetrical Configuration ◽  
Energy Flux Density

Electromagnetic field in a banded strip conductor excited by external AC voltage driven coil is analyzed. Inhomogeneous wave equation describing this axis-symmetrical configuration is deduced and solved to find the induced current density and the directional energy flux density (Poynting vector) in the conductor.

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