Journal ArticleDOI
P-wave resonances in positron-hydrogen scattering
TLDR
In this article, complex coordinate rotation was used to investigate the P-wave resonances in positron-hydrogen scattering by using an Elaborate Hylleraas-type wavefunctions with up to N=1120 terms.Abstract:
P-wave resonances in positron-hydrogen scattering are investigated by using the method of complex-coordinate rotation. Elaborate Hylleraas-type wavefunctions with up to N=1120 terms are used in the present investigation. A resonance below the hydrogen N=2 threshold is found at E=-0.254 112 Ryd with a half width of 1/2 Gamma =8.1*10-6 Ryd. Three resonances below the positronium N=2 threshold are also located. The lowest member is determined to lie at E=-0.148 181 Ryd, with a half width of 1/2 Gamma =0.000 297 Ryd. Error estimates for the resonance parameters are also given.read more
Citations
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Journal ArticleDOI
¿The positron-hydrogen system at low energies¿
Jim Mitroy,Kuru Ratnavelu +1 more
TL;DR: In this paper, the positron-hydrogen and positronium-proton scattering using the close coupling method are reported at energies below the ionization threshold, which gives integrated cross sections accurate to 10%.
Journal ArticleDOI
Resonances in positron-atom scattering
TL;DR: Theoretical studies of atomic resonances involving positrons are discussed in this paper, where resonances in positron-hydrogen scattering below various hydrogen and positronium thresholds are reviewed.
Journal ArticleDOI
High partial wave resonances in positron hydrogen scattering
Yew Kam Ho,Zong-Chao Yan +1 more
TL;DR: In this article, the authors present results for high angularmomentum resonances in positron-hydrogen scattering obtained by using the method of complex-coordinate rotations.
Journal ArticleDOI
The positron-hydrogen system in a six state model
Jim Mitroy,Andris T. Stelbovics +1 more
TL;DR: Close coupling calculations of positron-hydrogen scattering using a six state model are completed for incident energies from zero to 4.0 Rydberg, and all cross sections and phaseshifts for the e+-H(1s) entrance channels have been computed as discussed by the authors.
Journal ArticleDOI
Sequences of threshold resonances in - H scattering
TL;DR: In this paper, the positions of the resonances were found to shift slightly away from the threshold and their widths to broaden slightly, compared with those previously determined with smaller schemes, and the energy ratios and width ratios of the successive resonances of a sequence still reasonably satisfy the predicted scaling law.
References
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Journal ArticleDOI
The method of complex coordinate rotation and its applications to atomic collision processes
TL;DR: In this article, the theoretical and computational aspects of complex coordinate rotation are discussed, with emphasis on atomic resonance calculations, and applications to other areas such as molecular resonances, Stark effect in atoms, photoionization cross section calculations, etc., are also discussed.
Journal ArticleDOI
The Influence of Close Coupling on the Threshold Behaviour of Cross Sections of Electron-Hydrogen Scattering
M Gailitis,R Damburg +1 more
TL;DR: In this paper, the authors investigated the threshold behavior for electron-hydrogen scattering where an essential influence is being exerted by close coupling, which leads to long-range forces and found that the inelastic cross sections in the neighbourhood of the threshold oscillate.
Journal ArticleDOI
Electron-Hydrogen Scattering Calculation
TL;DR: In this paper, the Kohn variational principle was used to calculate the elastic electron-hydrogen scattering phase shifts for the L = 1$ with up to 84 "Hylleraas-type" trial functions.
Journal ArticleDOI
Generalized Hylleraas calculation of positron-hydrogen scattering
TL;DR: Positron-hydrogen scattering below positronium pickup threshold by Hylleraas bound technique, discussing phase shifts and linear parameters as discussed by the authors, discussed phase shift and linear parameter.
Journal ArticleDOI
Separation of Angles in the Two-Electron Problem
TL;DR: In this article, it was shown that well-known relations between angular momentum operators make it possible to determine the dependence of the wave function on three Euler angles, thus reducing the problem from six to three dimensions.
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