A critique of finite Hilbert basis set calculations for the angular distribution of ionized electrons produced in p+H impact at 20keV

Reading, J. F.; Fu, Jun; Fitzpatrick, Mathew J.

doi:10.1016/j.nimb.2005.07.006

Cited by 2 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The excellent agreement using CTMC acts as a decisive test to calculate other differential cross sections, such as angular distributions of ionized electrons, or electron energy distributions. [17]; quantum calculations, black curves [17,18]; red full curve, CTMC calculations [17]…”

Section: Scattering Angular Distributionsmentioning

confidence: 99%

“…3.13 are plotted experimental differential cross sections (full squares) dσ I /d e , with d e = 2π sinθ e dθ e , where θ e is the detection angle of the emitted target electron after ionization, for a projectile energy of 20 keV [17]. They are compared to a large variety of theoretical calculations, including quantum models (black curves) [17,18] and CTMC model (red curve). No quantum theory is able to reproduce the experimental data, especially at large detection angles.…”

Section: Angular Distributions Of Ionized Electronsmentioning

confidence: 99%

“…3.13 Differential cross section dσ I /d e following ionization in 20 keV H + + H collisions. Experiment, full squares[17]; quantum calculations, black curves[17,18]; red full curve, CTMC calculations[17]…”

mentioning

confidence: 99%

See 2 more Smart Citations

Classical Treatment of Aq+ + H Collisions

Frémont

2021

Springer Series on Atomic, Optical, and Plasma Physics

View full text Add to dashboard Cite

One-electron collisions systems A q+ + H collisions are studied within CTMC model and compared with available experiments and quantum calculations. A large part of the chapter is devoted to H + + H collisions, which is a decisive test to validate classical calculations. Total cross sections, as well as partial and differential cross sections, are discussed. Then, A q+ + H collisions are examined. Interest and MotivationInelastic collisional processes involving atom or ion projectiles and atomic hydrogen H are of considerable interest, experimentally and theoretically. Since H atom constitute 95% of our universe and are present in many structures and experiments on earth, the understanding of processes and the determination of probabilities and total, partial, and differential cross sections is necessary. On a practical point of view, such reactions are relevant in tokamak fusion reactors, interstellar medium or solar wind.Since absolute total cross sections are very difficult to obtain experimentally with uncertainties smaller than 10%, typically, theories have to be included and improved to compare with experimental results, and to predict detailed quantities such as partial or multi-differential cross sections.Many theoretical approaches were developed using quantum mechanics and resolution of the Schrödinger equation. A q+ + H collisions are of great interest because there is only one active target electron, so that electron correlation in target wave functions, that may obscure details of the collision dynamics, has not to be taken into account.One problem is not the determination of the total cross sections. Measured total cross sections can be reproduced by theories with a high or satisfactory degree of accuracy for a broad range of kinematic conditions. Even if the Distorted-Wave Born approximation (DWBA) yields good agreement with experiment, even if models like the Continuum-Distorted-Wave Eikonal-Initial State (CDW-EIS) or Three-Body-Distorted Wave (3DW) approaches give a better agreement, it was recognized that total cross sections are not ideally suited to test theory? Indeed, in the integration of

show abstract

Section: Scattering Angular Distributionsmentioning

confidence: 99%

Section: Angular Distributions Of Ionized Electronsmentioning

confidence: 99%

See 1 more Smart Citation

Classical Treatment of Aq+ + H Collisions

Frémont

2021

Springer Series on Atomic, Optical, and Plasma Physics

View full text Add to dashboard Cite

show abstract

“…Despite these problems, at 20 keV proton energy, it has been established that a two center FHBS expansion is necessary to describe the electron ejected from a hydrogen target (Reading et al, 2004). The usual FHBS approach treats electrons transferred to the projectile as distinguishable from electrons left near the target; the two distinctly centered bases have vanishing overlap as the two protons separate.…”

Section: Differential Cross Sectionsmentioning

confidence: 99%

“…But these methods do not clearly treat quantal interference effects which are perhaps important in the 20 keV proton energy range (Reading et al, 2004).…”

Section: Introductionmentioning

confidence: 99%