Destructive and constructive interferences of the second Born amplitudes for positronium formation

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.R1159· OSTI ID:7034791

Igarashi, A ^[1]; Toshima, N ^[2]

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1. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)
2. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan) Institute of Physical and Chemical Research (RIKEN), Wako 351-01 (Japan)

Differential cross sections for positronium formation into 1{ital s}, 2{ital s}, and 2{ital p} states are calculated exactly by the second Born approximation. Destructive interference of the two second-order amplitudes related to the Thomas double scattering is identified as the vanishing of the imaginary part of the second-order amplitudes. When the collision velocity is high, two sharp dips appear at 26{degree} and 39{degree}. These dips are produced by the mutual cancellation of the first- and the second-order terms rather than the destructive interference of the two second-order terms.

• OSTI ID: 7034791
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664500* -- Special Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BORN APPROXIMATION
CAPTURE
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HYDROGEN
NONMETALS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRONIUM