Importance of Thomas single-electron transfer in fast p-He collisions

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.012714· OSTI ID:21388739

Fischer, D ^[1]; Gudmundsson, M; Berenyi, Z; Haag, N; Johansson, H A. B.; Misra, D; Reinhed, P; Cederquist, H ^[1]; Kaellberg, A; Simonsson, A; Schmidt, H T ^[2]; Stoechkel, K ^[3]

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1. Department of Physics, Stockholm University, S-10691 Stockholm (Sweden)
2. Manne Siegbahn Laboratory, Stockholm University, S-11418 Stockholm (Sweden)
3. Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C (Denmark)

We report experimental angular differential cross sections for nonradiative single-electron capture in p-He collisions (p+ He -> H + He{sup +}) with a separate peak at the 0.47 mrad Thomas scattering angle for energies in the 1.3-12.5 MeV range. We find that the intensity of this peak scales with the projectile velocity as v{sub P}{sup -11}. This constitutes the first experimental test of the prediction from 1927 by L. H. Thomas [Proc. R. Soc. 114, 561 (1927)]. At our highest energy, the peak at the Thomas angle contributes with 13.5% to the total integrated nonradiative single-electron capture cross section.

• OSTI ID: 21388739
• Journal Information: Physical Review. A, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevA.81.012714; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON CAPTURE
ELECTRON TRANSFER
HELIUM IONS
MEV RANGE
PEAKS
SCATTERING
VELOCITY
CAPTURE
CHARGED PARTICLES
CROSS SECTIONS
ENERGY RANGE
IONS