Influence of the anisotropy of the positron wave function on the calculation of the momentum density of positron annihilation pairs

1991 ◽  
Vol 43 (11) ◽  
pp. 8841-8849 ◽  
Author(s):  
H. Sormann
Keyword(s):  
Wave Function ◽  
Positron Annihilation ◽  
Momentum Density ◽  
Positron Wave Function

Study of Single Crystals of Magnesium and Zinc by Positron Annihilation

1972 ◽  
Vol 50 (20) ◽  
pp. 2520-2522 ◽  
Author(s):  
E. H. Becker ◽  
E. M. D. Senicki ◽  
A. G. Gould ◽  
B. G. Hogg
Keyword(s):  
Wave Function ◽  
Single Crystals ◽  
Positron Annihilation ◽  
Enhancement Factor ◽  
Wave Functions ◽  
Theoretical Predictions ◽  
Positron Wave Function ◽  
Electronic Wave Functions ◽  
Simple Picture ◽  
Theory And Experiment

A point geometry positron annihilation angular correlation apparatus has been used to study oriented single crystals of magnesium and zinc. The results are compared with the theoretical predictions obtained from a simple picture of the electronic wave functions combined with two models for the positron wave function. The agreement between theory and experiment is considerably improved in the case of magnesium by the use of an enhancement factor.

MOMENTUM DISTRIBUTIONS OF TWO PHOTON ANNIHILATING POSITRON–ELECTRON PAIRS IN HEXANE AND DECANE

1967 ◽  
Vol 45 (12) ◽  
pp. 3895-3900 ◽  
Author(s):  
S. Y. Chuang ◽  
B. G. Hogg
Keyword(s):  
Wave Function ◽  
Positron Annihilation ◽  
Angular Correlation ◽  
High Precision ◽  
Atomic Carbon ◽  
Electron Pairs ◽  
Two Photon ◽  
Momentum Distributions ◽  
Positron Wave Function

Momentum distributions are calculated for electrons in the C–C and C–H bonds in hydrocarbons, using analytic SCF functions for atomic carbon orbitals and Heitler–London-type functions for the two paired electrons in the C–C and C–H bonds. The positron wave function is assumed to be a constant. The computed momentum distributions are then compared with high-precision experimental distributions obtained from positron-annihilation angular correlation experiments.

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