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Phys. Rev. A 70, 042705 (2004) [9 pages]

Absolute differential and total cross sections for direct and charge-transfer scattering of keV protons by O2

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R. Cabrera-Trujillo, Y. Öhrn, E. Deumens, and J. R. Sabin
Quantum Theory Project, Departments of Physics and Chemistry, University of Florida, P.O. Box 118435, Gainesville, Florida 32611-8435, USA

B. G. Lindsay
Department of Physics and Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005-1892, USA

Received 12 April 2004; revised 8 June 2004; published 12 October 2004

Calculated and experimental differential direct, charge-transfer, and total scattering cross sections are presented for collisions of H+ with O2 . Experimental cross sections are obtained for projectile energies of 0.5, 1.5, and 5.0  keV , and scattering angles of 0.15° to 5° while the theoretical results extend from 0.5  to  25  keV and encompass scattering angles from 0.01° to 180°. We find good agreement between the calculated and measured differential and total cross sections. Also, a diffraction slit effect, which is target orientation dependent, is found in the differential scattering cross section. A theoretical explanation of the effect is presented.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.70.042705
DOI: 10.1103/PhysRevA.70.042705
PACS: 34.50.−s, 34.70.+e

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