Importance of Thomas Single-Electron Transfer in Fast p-He Collisions
We report experimental angular differential cross sections for nonradiative single-electron capture in p-He collisions (p+ He → H + He+) 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 vP-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.
D. Fischer and M. Gudmundsson and Z. Berenyi and N. Haag and H. A. Johansson and D. S. Misra and P. Reinhed and A. Kallberg and A. Simonsson and K. Stochkel and H. Cederquist and H. T. Schmidt, "Importance of Thomas Single-Electron Transfer in Fast p-He Collisions," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 81, no. 1, pp. 012714-1-012714-4, American Physical Society (APS), Jan 2010.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.81.012714
Keywords and Phrases
Differential Cross Section; Experimental Test; Non-radiative; Projectile Velocity; Scattering Angles; Single Electron Capture; Single Electron Transfer; Electron Transport Properties
International Standard Serial Number (ISSN)
Article - Journal
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