Elastic scattering of intermediate-energy positrons and electrons by alkali atoms

1982 ◽  
Vol 60 (4) ◽  
pp. 601-604 ◽  
Author(s):  
J. M. Wadehra
Keyword(s):  
Wave Function ◽  
Elastic Scattering ◽  
Cross Section ◽  
Born Approximation ◽  
Intermediate Energy ◽  
Target Atom ◽  
Slater Type ◽  
Hartree Fock ◽  
Static Interaction ◽  
Alkali Atoms

In this paper we present the total elastic scattering cross section for collisions of intermediate energy (500–1000 eV) positrons and electrons by alkali atoms (Li, Na, K, Rb). Calculations are done by using the first Born approximation with polarization plus static interaction. The static interaction is obtained by using a Hartree–Fock–Slater type wave function for the target atom and the polarization interaction is modeled by using a pseudopotential.

scholarly journals GENETIC PROGRAMMING APPROACH FOR ELECTRON-ALKALI-METAL ATOM COLLISIONS

2006 ◽  
Vol 20 (32) ◽  
pp. 5463-5471 ◽  
Author(s):  
SALAH YASEEN EL-BAKRY ◽  
AMR RADI
Keyword(s):  
Experimental Data ◽  
Genetic Programming ◽  
Cross Sections ◽  
Alkali Metal Atom ◽  
Intermediate Energy ◽  
Target Atom ◽  
Programming Approach ◽  
Dipole Polarizability ◽  
Total Cross Sections ◽  
Alkali Atoms

New technique is presented for modeling the total cross sections of electron scattering by Na, K, Rb and Cs atoms in the low and intermediate energy regions. The calculations have been performed in the framework of genetic programming (GP) technique. The GP has been running based on the experimental data of the total collisional cross sections to produce the total cross sections for each target atom. The incident energy and atomic number as well as the static dipole polarizability have been used as input variables to find the functions that describe the total collisional cross sections of the scattering of electrons by alkali atoms. The experimental, calculated and predicted total collisional cross sections are compared. The discovered functions show a good match to the experimental data.

scholarly journals Electron scattering cross-sections for particle transport modeling in a weakly ionized air plasma

2021 ◽  
Vol 51 ◽  
pp. 96-111
Author(s):  
Vasily Sergeevich Zakharov ◽  
Mikhail Evgenievich Zhukovskiy ◽  
Sergey Vasilievich Zakharov ◽  
Mikhail Borisovich Markov
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Electron Scattering ◽  
Cross Sections ◽  
Electron Interaction ◽  
Inelastic Electron ◽  
Neutral Atoms ◽  
Hartree Fock ◽  
Wide Range ◽  
The Cross

Data on processes of electron scattering on ions and neutral atoms are required in fundamental studies and in applied research in such fields as astro- and laser physics, low density plasma simulations, kinetic modeling etc. Experimental and computational data on elastic and inelastic electron scattering in a wide range of electron energies is available mostly for the electron interaction with neutral atoms, but are very limited for the scattering on ions, notably for elastic processes. In present work the calculational approaches for the cross-section computation of electron elastic and inelastic scattering on neutral atoms and ions are considered. The atomic and ion properties obtained in quantum-statistical Hartree-Fock-Slater model are used in the direct computation of electron elastic scattering and ionization cross-sections by a partial waves method, semiclassical and distorted-wave approximations. Calculated cross-sections for elastic scattering on nitrogen and oxygen atoms and ions, and electron ionisation cross-sections are compared with the available experimental data and widely used approximations and propose consistent results. Considering applicability of Hartree-Fock-Slater model in wide scope of temperatures and densities, such approach to the cross-section calculation can be used in a broad range of energies and ion charges.

MATTER-DENSITY DISTRIBUTION IN THREE-NUCLEON NUCLEI AND THEIR DIFFRACTIVE INTERACTION WITH HEAVY NUCLEI

2009 ◽  
Vol 18 (03) ◽  
pp. 665-674
Author(s):  
YU. A. BEREZHNOY ◽  
V. YU. KORDA ◽  
A. G. GAKH
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Elastic Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Form Factors ◽  
Matter Density ◽  
Wave Functions ◽  
Heavy Nuclei ◽  
Nucleus Scattering

The nonrelativistic wave functions of 3 H and 3 He nuclei have been obtained on the basis of the experimentally measured charge form factors. The differential cross section of the elastic 3 He -nucleus scattering has been calculated with the help of the wave function derived. This cross section agrees with the experimental data on the elastic scattering of 3 He by 90 Zr , 120 Sn , and 208 Pb nuclei at 130 and 217 MeV. The integrated cross sections of various processes of 3 H and 3 He interaction with heavy nuclei have also been calculated.

scholarly journals Laser-Assisted (e, 2e) Collisions in the Symmetric/Asymmetric Coplanar Geometry

Atoms ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 40
Author(s):  
Abdelkader Makhoute ◽  
Driss Khalil ◽  
Imane Ajana
Keyword(s):  
Cross Section ◽  
Born Approximation ◽  
Laser Field ◽  
Target Atom ◽  
Wave Functions ◽  
Final States ◽  
Triple Differential Cross Section ◽  
Comprehensive Survey ◽  
Direction Of Polarization ◽  
Target Wave

In this review, we present a comprehensive survey of laser-assisted (e, 2e) reactions. The influence of a laser field on the dynamics of (e, 2e) collisions in atomic hydrogen is analyzed in the symmetric and asymmetric coplanar geometries. Particular attention is devoted to the construction of the dressed (laser-modified) target wave functions, in both the initial and final states. The calculation is performed in the framework of Coulomb-Volkov-Born approximation, where the initial and final electrons are described by Volkov wave functions, while the interaction of the incident electron with the target atom is treated in the first and the second Born approximation. The state of the ejected electron is described by a Volkov/Coulomb-Volkov wave function. A detailed account is also given of the techniques we have used to evaluate the scattering amplitudes. The influence of the laser parameters (frequency, intensity, and direction of polarization) on the angular distribution of the ejected electron is discussed, and a number of illustrative examples are given. The structure of the triple differential cross section in the vicinity of resonances is also analyzed.

scholarly journals Laser Assisted Electron - Alkali Atom Collisions

1996 ◽  
Vol 49 (6) ◽  
pp. 1109 ◽  
Author(s):  
Vinod Prasad ◽  
Rinku Sharma ◽  
Man Mohan
Keyword(s):  
Cross Section ◽  
Born Approximation ◽  
Laser Intensity ◽  
Alkali Atom ◽  
Incident Electron Energy ◽  
Excitation Process ◽  
Alkali Atoms ◽  
Atom Interaction ◽  
Electron Photon ◽  
Atomic States

Lasar assisted inelastic scattering of electrons by alkali atoms is studied theoretically. The non-perturbative quasi-energy method, which is generalised for many atomic states, is used to describe the laser–atom interaction, and the electron–atom interaction is treated within the first Born approximation. We have calculated the total cross section for the excitation of sodium atoms due to simultaneous electron–photon collisions. We show the effect of laser and collision parameters, e.g. laser intensity, polarisation and incident electron energy, on the excitation process.

Elastic Scattering in Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 252-253
Author(s):  
J. Langmore ◽  
M. Isaacson ◽  
J. Wall ◽  
A. V. Crewe
Keyword(s):  
Electron Microscopy ◽  
Elastic Scattering ◽  
Cross Section ◽  
Quantum Noise ◽  
Dark Field ◽  
Elastic Cross Section ◽  
Biological Molecules ◽  
Dark Field Microscopy ◽  
Field Systems ◽  
Effects Of Radiation

High resolution dark field microscopy is becoming an important tool for the investigation of unstained and specifically stained biological molecules. Of primary consideration to the microscopist is the interpretation of image Intensities and the effects of radiation damage to the specimen. Ignoring inelastic scattering, the image intensity is directly related to the collected elastic scattering cross section, σɳ, which is the product of the total elastic cross section, σ and the eficiency of the microscope system at imaging these electrons, η. The number of potentially bond damaging events resulting from the beam exposure required to reduce the effect of quantum noise in the image to a given level is proportional to 1/η. We wish to compare η in three dark field systems.

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