Importance of Thomas single-electron transfer in fast<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:math>-He collisions
D. FischerDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenMagnús T. GuðmundssonDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenZ. BerényiDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenN. HaagDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenHenrik JohanssonDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenDeepankar MisraDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenP. ReinhedDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenA. KällbergManne Siegbahn Laboratory, Stockholm University, S-11418 Stockholm, SwedenA. SimonssonManne Siegbahn Laboratory, Stockholm University, S-11418 Stockholm, SwedenKristian StøchkelInstitute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, DenmarkH. CederquistDepartment of Physics, Stockholm University, S-10691 Stockholm, SwedenH. T. SchmidtManne Siegbahn Laboratory, Stockholm University, S-11418 Stockholm, Sweden
2010lv
ABI
Abstract
We report experimental angular differential cross sections for nonradiative single-electron capture in $p$-He collisions ($p+$ He $\ensuremath{\rightarrow}$ 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 ${v}_{\mathrm{P}}^{\ensuremath{-}11}$. 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.
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