Angular and polarization effects in relativistic potential scattering of electrons in a powerful laser field

1999 ◽  
Vol 77 (8) ◽  
pp. 591-602 ◽  
Author(s):  
P Panek ◽  
J Z Kamiñski ◽  
F Ehlotzky
Keyword(s):  
Laser Field ◽  
Potential Scattering ◽  
Dipole Approximation ◽  
Powerful Laser ◽  
Scattered Electron ◽  
Electromagnetic Plane Wave ◽  
Polarization Effects ◽  
Nonrelativistic Case ◽  
First Order ◽  
Spin Effects

In view of recent advances in the development of powerful laser sources renewed interest has been devoted to the investigation of electron-scattering processes in very strong laser fields. Here, were consider the scattering of electrons by a potential in a strong electromagnetic plane wave. Since to a first order of approximation spin effects can be neglected, we describe the scattered electron by a laser-dressed Klein-Gordon particle. It is shown in a first-order Born approximation that at nearly relativistic scattering conditions, in which the space-dependence of the laser field cannot be ignored, characteristic angular and polarization effects can be encountered for specific scattering configurations that will not show up in the nonrelativistic case where the radiation field is treated in the dipole approximation. We also demonstrate that even for laser-field intensities at which nonrelativistic calculations should apply one can observe discrepancies between relativistic and nonrelativistic results.PACS Nos.: 34.50.Rk, 34.80.Qb, 32.80.Wr

Electron-atom potential scattering assisted by a bichromatic elliptically polarized laser field

2017 ◽  
Vol 71 (10) ◽  
Author(s):  
Arman Korajac ◽  
Dino Habibović ◽  
Aner Čerkić ◽  
Mustafa Busuladžić ◽  
Dejan B. Milošević
Keyword(s):  
Laser Field ◽  
Potential Scattering ◽  
Electron Atom ◽  
Elliptically Polarized ◽  
Atom Potential

scholarly journals Excitation of Atomic Hydrogen by Proton Impact in the Presence of a Resonant Laser Field Using the First Order Magnus Approximation

1992 ◽  
Vol 45 (1) ◽  
pp. 47 ◽  
Author(s):  
Bhupat Sharma ◽  
Man Mohan
Keyword(s):  
Laser Beam ◽  
Computer Time ◽  
Dipole Approximation ◽  
Collision Dynamics ◽  
Hydrogen Atoms ◽  
Close Coupling ◽  
First Order ◽  
Resonant Laser ◽  
Atom Interaction ◽  
Transverse Polarisation

We consider proton collisions from hydrogen atoms in the presence of a laser beam (taken in the electric dipole approximation) that resonantly (or nearly resonantly) excites the hydrogen atoms from the Is to the 2p state. The laser beam is linearly polarised with polarisation either parallel (longitudinal) or perpendicular (transverse) to the direction of incidence of the proton. A non-perturbative quasi-energy approach is used to describe the laser-atom interaction, while the first-order Magnus approximation is used to describe the collision dynamics in the presence of the nearly resonant laser beam. We have calculated the integrated cross section o-(2s} for the excitation of the 2s state. It is found that 0-(2s} is small for longitudinal polarisation, as compared with transverse polarisation. We have also compared our field-free results obtained by using the first-order Magnus approximation to that obtained by the close-coupling approximation. Although both methods give excellent results, the former method is quite demanding in terms of computer time.

RELATIVISTIC ENERGY, OSCILLATOR STRENGTHS AND TRANSITION RATES OF THE 1s2 2 ln l 1S(m)(n =2–6, m1–5) STATES FOR Be-LIKE SYSTEM

2005 ◽  
Vol 16 (06) ◽  
pp. 951-968 ◽  
Author(s):  
MENG ZHANG ◽  
BING-CONG GOU
Keyword(s):  
Experimental Data ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Relativistic Energy ◽  
Transition Rates ◽  
Isoelectronic Sequence ◽  
Polarization Effects ◽  
First Order ◽  
Variational Calculations ◽  
First Order Perturbation

Variational calculations are carried out with a multiconfiguration-interaction wave function to obtain the relativistic energies of the 1s2 2 ln l 1 S (m)(n =2–6, m1–5) states for the beryllium isoelectronic sequence (Z =4–10). Relativistic corrections and the mass polarization effects are evaluated with the first-order perturbation theory. The identifications of the energy levels for 1s2 2 ln l 1 S (m)(n =2–6, m1–5) states in the Be-like ions are reported. The oscillator strengths, transition rates and wavelengths are also calculated. The calculated results are compared with other theoretical and experimental data in the literature.

Laser-induced Compton scattering from a bound electron

1992 ◽  
Vol 70 (1) ◽  
pp. 72-77 ◽  
Author(s):  
F. Ehlotzky
Keyword(s):  
Angular Distribution ◽  
Compton Scattering ◽  
Harmonic Generation ◽  
Cross Sections ◽  
Laser Field ◽  
Multiphoton Ionization ◽  
Ionization Threshold ◽  
Powerful Laser ◽  
Bound Electrons ◽  
Bound Electron

We investigate nonrelativistically Compton scattering by an electron bound in hydrogen in a powerful laser field. The corresponding nonlinear rates and cross sections are evaluated in a Keldysh-type of approximation and compared with the rates and cross sections of multiphoton ionization and harmonic generation. We find that multiphoton ionization overshadows Compton scattering by many orders of magnitude, however, Compton scattering may well compete with harmonic generation above the ionization threshold, since, in particular, both processes have the same angular distribution and only odd harmonics can be created by bound electrons, while in bound-free Compton scattering all harmonics will be generated.

The potential model treatment of the scattering of electrons by atoms and the existence of negative ions

1961 ◽  
Vol 16 (5) ◽  
pp. 492-500
Author(s):  
F. B. Malik ◽  
E. Trefftz
Keyword(s):  
Bound States ◽  
Negative Ions ◽  
Potential Scattering ◽  
Point Of View ◽  
Neutral Atoms ◽  
Many Body ◽  
Scattered Electron ◽  
Scattered Particle ◽  
Potential Term ◽  
The Many

The low energy scattering of electrons by different neutral atoms has been treated by assuming that the atomic wave functions remain unchanged even at the presence of the scattered particle and by neglecting the exchange between the scattered electron and the bound electrons. The potential term in the differential equation of the scattered particle is exactly the atomic potential of the neutral atom and is approximated by analytical expressions, yielding the potential scattering equation. The variational treatments of Hulthén, Kohn and a related one suggested by Malik, are applied to solve this equation for a Hartree atom with l=0. The scattering by He, C and N is treated explicitly and the results of He indicate that in this way one may get some good result without going into the great complexity of the many body problem. It is further pointed out that the study of scattering by neutral atoms near zero energy under this model may serve as a possible mean to investigate the existence of different negative ions and their number of bound states. It seems from this point of view that He-, C- and N- for this model may exist and have one bound s-state.

scholarly journals QUANTUM LARMOR RADIATION FROM A MOVING CHARGE IN AN ELECTROMAGNETIC PLANE WAVE BACKGROUND

2012 ◽  
Vol 27 (24) ◽  
pp. 1250142 ◽  
Author(s):  
GEN NAKAMURA ◽  
KAZUHIRO YAMAMOTO
Keyword(s):  
Plane Wave ◽  
Quantum Effect ◽  
Radiation Energy ◽  
Theoretical Formula ◽  
Total Radiation ◽  
Electromagnetic Plane Wave ◽  
First Order ◽  
Total Radiation Energy ◽  
Plane Wave Background ◽  
Electromagnetic Plane

We extend our previous work [Phys. Rev. D83, 045030 (2011)], which investigated the first-order quantum effect in the Larmor radiation from a moving charge in a spatially homogeneous time-dependent electric field. Specifically, we investigate the quantum Larmor radiation from a moving charge in a monochromatic electromagnetic plane wave background based on the scalar quantum electrodynamics at the lowest order of the perturbation theory. Using the in–in formalism, we derive the theoretical formula of the total radiation energy from a charged particle in the initial states being at rest and being in a relativistic motion. Expanding the theoretical formula in terms of the Planck constant ℏ, we obtain the first-order quantum effect on the Larmor radiation. The quantum effect generally suppresses the total radiation energy compared with the prediction of the classical Larmor formula, which is a contrast to the previous work. The reason is explained by the fact that the radiation from a moving charge in a monochromatic electromagnetic plane wave is expressed in terms of the inelastic collisions between an electron and photons of the background electromagnetic waves.

scholarly journals Polarization effects in above-threshold ionization of Mg with a mid-infrared strong laser field

2017 ◽  
Vol 875 ◽  
pp. 022023
Author(s):  
Huipeng Kang ◽  
SongPo Xu ◽  
YanLan Wang ◽  
XuanYang Lai ◽  
Thomas Pfeifer ◽  
...  
Keyword(s):  
Laser Field ◽  
Strong Laser Field ◽  
Mid Infrared ◽  
Threshold Ionization ◽  
Polarization Effects ◽  
Strong Laser ◽  
Above Threshold Ionization
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