Computer calculations of slow electrons scattering by sodium atoms

1977 ◽  
Vol 55 (7-8) ◽  
pp. 742-746 ◽  
Author(s):  
T. D. Bui
Keyword(s):  
Cross Sections ◽  
Sodium Atom ◽  
Incident Electron ◽  
Not Given ◽  
Atom Scattering ◽  
Sodium Atoms ◽  
Variational Calculations ◽  
Computer Calculations ◽  
Explicit Formulae ◽  
Slow Electrons

This is an addendum to a previous paper (Bui and Stauffer, to be referred to as I). The explicit formulae which are not given in I for the case of electron–sodium atom scattering are given in this addendum. Tables of all appreciable partial waves with L ≤ 10 are presented for various values of the energy of the incident electron up to 4 eV. Results for the total elastic cross sections are compared with the most recent variational calculations of Sinfailam and Nesbet.

The Scattering Equations for Charged Particles Colliding with Many Body Systems

1975 ◽  
Vol 53 (17) ◽  
pp. 1615-1623 ◽  
Author(s):  
T. D. Bui ◽  
A. D. Stauffer
Keyword(s):  
Cross Sections ◽  
Adiabatic Approximation ◽  
Perturbation Technique ◽  
Sodium Atom ◽  
Orbital Method ◽  
Many Body ◽  
First Order ◽  
Atom Scattering ◽  
Alkali Atoms ◽  
Many Body Systems

We have derived the total wave function of a many body system scattering by a charged particle by using a first order perturbation technique (the polarized orbital method). The derivation is based on an adiabatic approximation for the incoming particle. Particular cases of electrons colliding with the alkali atoms are shown. S, P, and D wave phase shifts and the total elastic cross sections for electron–sodium atom scattering are calculated using this method for the energy range 0 to 4 eV.

Bremsstrahlung Cross Sections for Al and Au for Incident-Electron Energies of 0.05 and 0.20 MeV

1970 ◽  
Vol 2 (6) ◽  
pp. 2190-2196 ◽  
Author(s):  
D. H. Rester ◽  
N. Edmonson ◽  
Q. Peasley
Keyword(s):  
Cross Sections ◽  
Incident Electron

Some comments on positron–atom scattering at intermediate energy

1982 ◽  
Vol 60 (4) ◽  
pp. 558-564 ◽  
Author(s):  
F. W. Byron Jr.
Keyword(s):  
Finite Number ◽  
Cross Sections ◽  
Infinite Number ◽  
Intermediate Energy ◽  
Total Cross Sections ◽  
Type Approximation ◽  
Atom Scattering ◽  
Target States

A brief survey of available theoretical techniques is given for positron–atom scattering. The distinction between methods involving a finite number of target states and those with an infinite number of target states is emphasized. The situation regarding total cross sections is summarized, and a new, non-perturbative, eikonal-type approximation, based on the work of Wallace, is introduced.

scholarly journals The Cross Section for the J = 0 → 2 Rotational Excitation of Hydrogen by Slow Electrons

1969 ◽  
Vol 22 (6) ◽  
pp. 715 ◽  
Author(s):  
RW Crompton ◽  
DK Gibson ◽  
AI McIntosh
Keyword(s):  
Momentum Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
The Cross ◽  
Excitation Processes ◽  
Slow Electrons ◽  
And Diffusion ◽  
Momentum Transfer Cross Section ◽  
Section Analysis

The results of electron drift and diffusion measurements in parahydrogen have been analysed to determine the cross sections for momentum transfer and for rotational and vibrational excitation. The limited number of possible excitation processes in parahydrogen and the wide separation of the thresholds for these processes make it possible to determine uniquely the J = 0 → 2 rotational cross section from threshold to 0.3 eV. In addition, the momentum transfer cross section has been determined for energies less than 2 eV and it is shown that, near threshold, a vibrational cross section compatible with the data must lie within relatively narrow limits. The problems of uniqueness and accuracy inherent in the swarm method of cross section analysis are discussed. The present results are compared with other recent theoretical and experimental determinations; the agreement with the most recent calculations of Henry and Lane is excellent.

Pseudopotential calculations of elastic scattering of electrons by helium atoms in the range 0–20 eV

1990 ◽  
Vol 68 (1) ◽  
pp. 104-110 ◽  
Author(s):  
B. Plenkiewicz ◽  
P. Plenkiewicz ◽  
J.-P. Jay-Gerin
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Momentum Transfer ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Incident Electron ◽  
Elastic Electron ◽  
Scattering System ◽  
Helium Atoms ◽  
Pseudopotential Calculations

Our earlier pseudopotential calculations on electrons colliding with argon and krypton are extended to consider the elastic electron–helium scattering system. In this paper, we present detailed results for phase shifts, differential, total, and momentum-transfer cross sections for this system for incident electron energies in the range from 0 to 20 eV. These agree very well with existing experimental data and with other theoretical calculations.

scholarly journals The inelastic scattering of slow electrons in gases.—IV

1933 ◽  
Vol 142 (847) ◽  
pp. 647-658 ◽  
Keyword(s):  
Angular Distribution ◽  
Inelastic Scattering ◽  
Incident Electron ◽  
Angular Distributions ◽  
Mercury Vapour ◽  
Preliminary Results ◽  
Excitation Potential ◽  
Discrete Amount ◽  
Slow Electrons ◽  
Diffraction Effects

Recent investigations have shown that the inelastic scattering of electrons in gases exhibits some very interesting phenomena. In previous papas we have described the angular distribution of the scattering of electrons which have lost a discrete amount of energy. Papers I and II described preliminary results which established the existence of diffraction effects at large angles in a number of gases. In Paper III the measurements were carried out over a range of velocities lower than those previously studied, results being obtained for incident electron energies down to within a few volts of the excitation potential. angular distributions were obtained for the inelastic scattering of electrons in hydrogen, helium, and argon between the angles 10° and 155°. The present paper describes the extension of the measurements to methane, nitrogen, neon and mercury vapour.

On the Cross Sections ofCl2andN2for Slow Electrons

1937 ◽  
Vol 51 (1) ◽  
pp. 25-28 ◽  
Author(s):  
J. B. Fisk
Keyword(s):  
Cross Sections ◽  
The Cross ◽  
Slow Electrons

Über das Dissoziationsgleichgewicht realer Gase

1966 ◽  
Vol 21 (3) ◽  
pp. 252-255
Author(s):  
H. Koppe ◽  
G. Spies
Keyword(s):  
Cross Sections ◽  
Bound States ◽  
Exact Expression ◽  
Mass Action ◽  
Quantum Mechanical ◽  
Law Of Mass Action ◽  
Vibrational States ◽  
Degree Of Dissociation ◽  
Atom Scattering ◽  
Collision Approximation

The quantum mechanical cluster expansion, when applied to the partition function of a gas consisting of atoms whose bound states are the rotational and vibrational states of diatomic molecules, provides an exact expression for the degree of dissociation. The approximation containing only the second cluster integral is shown to be identical with the law of mass action involving the binary collision approximation for the activity coefficient of the dissociated constituent. This coefficient can be calculated from the phase shifts and thus from the cross sections of the elastic atom-atom-scattering.

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