scholarly journals Вероятность процессов захвата электронов у атомов аргона ионами -=SUP=-3-=/SUP=-Не-=SUP=-2+-=/SUP=- при различных параметрах удара

2019 ◽  
Vol 89 (3) ◽  
pp. 342
Author(s):  
А.А. Басалаев ◽  
М.Н. Панов
Keyword(s):  
Cross Sections ◽  
Particle Interaction ◽  
Target Atom ◽  
Interaction Potentials ◽  
Atomic Particle ◽  
Total Cross Sections ◽  
Singly Charged ◽  
Scattering Cross Sections ◽  
The Impact ◽  
Argon Ion

AbstractWe have measured the absolute values of total cross sections of capture of one and two electrons by He^2+ ions from argon atoms. The differential scattering cross sections have been determined for fast atoms and singly charged helium ions formed in each of these processes (without and with additional ionization of the formed slow argon ion). Measurements have been taken for He^2+ ions with kinetic energy of 6 keV in scattering angle range 0–2.5°. Based on the measured differential cross sections using different model atomic particle interaction potentials, we have calculated the cross sections of these processes as functions of the impact parameter. The probabilities of realization of these processes with electron density distribution in different shells in the target atom have been compared. The applicability of the expressions for the screened Coulomb interaction potentials in the description of scattering of particles that have captured electrons has been demonstrated.

scholarly journals Interaction potentials and ultracold scattering cross sections for the Li+7–Li7 ion-atom system

2020 ◽  
Vol 101 (5) ◽  
Author(s):  
A. Pandey ◽  
M. Niranjan ◽  
N. Joshi ◽  
S. A. Rangwala ◽  
R. Vexiau ◽  
...  
Keyword(s):  
Cross Sections ◽  
Interaction Potentials ◽  
Scattering Cross ◽  
Scattering Cross Sections ◽  
Atom System

Photoelectric cross sections derived from the total absorption cross sections in the energy range 5–130 keV

1979 ◽  
Vol 57 (1) ◽  
pp. 92-98 ◽  
Author(s):  
K. S. Puttaswamy ◽  
Ramakrishna Gowda ◽  
B. Sanjeevaiah
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Proportional Counter ◽  
Atomic Data ◽  
Total Absorption ◽  
Absorption Cross ◽  
Total Cross Sections ◽  
Scattering Cross ◽  
Data Tables ◽  
Scattering Cross Sections

Total absorption cross sections in the elements C, Al, S, Cu, Zr, Ag, Sn, Ta, Au, and Pb for photons of energies 5.0, 5.9, 6.4, 8.1, 10.6, 14.4, 24.7, 32.9, 36.9, 66.6, and 129 keV are measured using a krypton-filled proportional counter in the energy range 5 to 25 keV and a thin NaI(Tl) detector in the energy range 30 to 130 keV. The measured total absorption cross sections are compared with those of Miller and Greening and McCrary, Plassman, Paekett, Conner, and Zimmermann. The scattering cross sections obtained by interpolation using the Atomic Data Tables are subtracted from the total cross sections to obtain the photoelectric cross sections and these are further compared with the recent theoretical values of Scofield.

scholarly journals Total Electron Scattering Cross Sections of He, Ne, Ar, Kr and Xe in the Energy Range 100 eV to 10 000 eV

2009 ◽  
Vol 64 (9-10) ◽  
pp. 665-670
Author(s):  
Xiao-Ming Tan ◽  
Chuan-Lu Yang ◽  
Mei-Shan Wang ◽  
Zhi-Hong Zhang
Keyword(s):  
Energy Range ◽  
Electron Scattering ◽  
Cross Sections ◽  
Model Potential ◽  
Total Electron ◽  
Total Cross Sections ◽  
Optical Model Potential ◽  
Scattering Cross Sections ◽  
Experimental And Theoretical Studies ◽  
Theoretical Results

The total cross sections for electron scattering from He, Ne, Ar, Kr and Xe in the energy range from 100 eV to 10 000 eV have been calculated based on the optical-model potential. Our theoretical results are compared with the available experimental data. The consistency between them is also discussed. At higher energies (over 2000 eV for He, over 5000 eV for Ne, Ar, Kr and Xe), the total cross sections of electron scattering from these atoms are scarce, so our calculations will give a reference for further experimental and theoretical studies.

scholarly journals Semi-classical bounds on scattering cross sections in two dimensional magnetic fields

1997 ◽  
Vol 147 ◽  
pp. 25-61
Author(s):  
Hideo Tamura
Keyword(s):  
Magnetic Fields ◽  
Energy Range ◽  
Cross Sections ◽  
Classical Limit ◽  
Uniform Boundedness ◽  
Classical Dynamics ◽  
Two Dimensional ◽  
Total Cross Sections ◽  
Scattering Cross ◽  
Scattering Cross Sections

AbstractWe prove the uniform boundedness of averaged total cross sections or of quantities related to scattering into cones in the semi-classical limit for scattering by two dimensional magnetic fields. We do not necessarily assume that the energy under consideration is in a non-trapping energy range in the sense of classical dynamics.

Gaseous and surface reactions involving helium metastable atoms and resonance photons

1957 ◽  
Vol 241 (1225) ◽  
pp. 270-282 ◽  
Keyword(s):  
Cross Sections ◽  
Gold Surface ◽  
Target Atom ◽  
Photon Flux ◽  
Total Cross Sections ◽  
Metastable Helium ◽  
Helium Atoms ◽  
Atom Flux ◽  
Collision Chamber ◽  
Argon Ions

The absolute electron yield ( γ M ) for He (2 3 S ) metastable atoms incident on a gold surface has been measured. The method requires passage of a metastable atom flux through a collision chamber containing argon and thence to the gold surface. From observations on the current of argon ions arising from collisions of the type He (2 3 S ) + A → He + A + + e , together with measurements of the electron emission from the gold surface, γ M may be determined. The total cross-sections for collisions between metastable helium atoms and He, Ne, A and K have been measured and in the asymmetrical cases are observed to rise linearly with increasing atomic number of the target atom. Some collisions involving helium resonance radiation have also been studied. In particular, the photo-electric yield from the gold surface has been determined together with the attenuation of the photon flux in passage through certain noble gases.

SEMI-CLASSICAL ANALYSIS FOR TOTAL CROSS-SECTIONS OF MAGNETIC SCHRÖDINGER OPERATORS IN TWO DIMENSIONS

1995 ◽  
Vol 07 (03) ◽  
pp. 443-480 ◽  
Author(s):  
HIDEO TAMURA
Keyword(s):  
Cross Sections ◽  
Classical Limit ◽  
Schrödinger Operators ◽  
Two Dimensions ◽  
Schrodinger Operators ◽  
Classical Analysis ◽  
Total Cross Sections ◽  
Total Scattering ◽  
Scattering Cross ◽  
Scattering Cross Sections

We define total scattering cross-sections for magnetic Schrödinger operators in two dimensions and prove the shadow scattering (the quantum total cross-sections double the classical ones in the semi-classical limit) under some assumptions.

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 Some Recent Results on High-Energy Proton Interactions

Particles ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 57-69 ◽  
Author(s):  
I. M. Dremin
Keyword(s):  
Cross Sections ◽  
Scattering Amplitude ◽  
High Energy ◽  
Unitarity Condition ◽  
Total Cross Sections ◽  
Energy Proton ◽  
Elastic Scattering Amplitude ◽  
Energy Behavior ◽  
Impact Parameter Space ◽  
The Impact

Recent experimental results about the energy behavior of the total cross sections, the share of elastic and inelastic contributions to them, the peculiar shape of the differential cross section and our guesses about the behavior of real and imaginary parts of the elastic scattering amplitude are discussed. The unitarity condition relates elastic and inelastic processes. Therefore it is used in the impact-parameter space to get some information about the shape of the interaction region of colliding protons by exploiting new experimental data. The obtained results are described.

scholarly journals Positron interactions with nitrogen and oxygen molecules: elastic, inelastic and total cross sections

2019 ◽  
Vol 73 (12) ◽  
Author(s):  
Lilian Ellis-Gibbings ◽  
Francisco Blanco ◽  
Gustavo García
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Impact Energy ◽  
Optical Theorem ◽  
Calculation Methods ◽  
Positron Scattering ◽  
Total Cross Sections ◽  
Scattering Cross ◽  
Simple Molecules ◽  
Scattering Cross Sections

Abstract Positron scattering cross sections, used for modelling particle transport in various media, are difficult to gather experimentally. As such, various cross section calculation methods have been developed to varying accuracy. The IAM-SCAR+I method has been improved upon recently to fulfil the optical theorem and the results for two important simple molecules, N2 and O2, are presented here. These results are compared to literature and our findings are comparable in most impact energy ranges. Graphical abstract

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