The effect of positronium formation in positron—alkali-atom scattering

1994 ◽  
Vol 227 (4-5) ◽  
pp. 429-435 ◽  
Author(s):  
H. Ray ◽  
Sadhan K. Adhikari ◽  
A.S. Ghosh
Keyword(s):  
Alkali Atom ◽  
Positronium Formation ◽  
Atom Scattering

scholarly journals Close Coupling Theory of Positron Scattering from Alkali Atoms

1994 ◽  
Vol 47 (6) ◽  
pp. 721 ◽  
Author(s):  
Jim Mitroy ◽  
Kurunathan Ratnavelu
Keyword(s):  
Cross Sections ◽  
Alkali Atom ◽  
Coupling Theory ◽  
Positron Scattering ◽  
Close Coupling ◽  
Total Cross Sections ◽  
Hartree Fock ◽  
Atom Scattering ◽  
Alkali Atoms ◽  
Rearrangement Process

The close coupling equatious for positron-alkali atom scattering are written as a set of coupled momentum-space Lippmann-Schwinger equations. The alkali atom is represented by a frozen-core model based upon the Hartree-Fock approximation. The interaction between the positronium and the residual ion is modified by the inclusion of a core potential. Similarly, a core term is present in the interaction describing the rearrangement process. Close coupling calculations of positron scattering from sodium are performed in a model containing multiple sodium (3s, 3p, 4s, 3d, 4p) and positronium (Is, 2s, 2p) states. Cross sections are reported for an energy range from threshold to 50�eV; the total cross sections are in agreement with experimental data.

Electron-Alkali-Atom Scattering—A Nonadiabatic Approach

1966 ◽  
Vol 147 (1) ◽  
pp. 69-72 ◽  
Author(s):  
M. H. Mittleman
Keyword(s):  
Alkali Atom ◽  
Atom Scattering

Positronium–alkali atom scattering at medium energies

2004 ◽  
Vol 37 (8) ◽  
pp. 1709-1723
Author(s):  
Ajoy Chakraborty ◽  
Arindam Basu ◽  
Nirmal K Sarkar ◽  
Prabal K Sinha
Keyword(s):  
Alkali Atom ◽  
Atom Scattering

Measurements of positronium formation cross sections for positron–potassium atom scattering

1994 ◽  
Author(s):  
L. Jiang ◽  
W. E. Kauppila ◽  
C. K. Kwan ◽  
S. P. Parikh ◽  
T. S. Stein ◽  
...  
Keyword(s):  
Cross Sections ◽  
Potassium Atom ◽  
Positronium Formation ◽  
Atom Scattering

Ultracold Atomic Interactions and Bose–Einstein Condensation

1997 ◽  
Vol 11 (28) ◽  
pp. 3297-3304 ◽  
Author(s):  
D. J. Heinzen
Keyword(s):  
Molecular Spectroscopy ◽  
Scattering Length ◽  
Alkali Atom ◽  
Einstein Condensation ◽  
S Wave ◽  
Self Energy ◽  
Atom Scattering ◽  
Atomic Interactions ◽  
Scattering Lengths ◽  
The Stability

Atomic interactions play a crucial role in Bose-condensed alkali gases. The condensate self-energy, proportional to the two-body s-wave scattering length, strongly affects the stability and other properties of a condensate. Alkali atom scattering lengths have been determined only during the past few years by a combination of conventional molecular spectroscopy, photoassociation spectroscopy, and ultracold atomic collision studies. In this article, we present a brief review of alkali atom interactions and scattering length determinations.

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