Double ionization of helium in collision with 20–500-keV/amu C^q+ and O^q+ (q=1–3) ions

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X. R. Zou,¹ J. X. Shao,¹ X. M. Chen,¹ Y. Cui,¹ Z. M. Gao,¹ Y. Z. Yin,¹ B. W. Ding,¹ Z. Li,¹ and D. Y. Yu²
¹School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
²Institute of Modern Physics, The Chinese Academy of Science, Lanzhou 730000, China

Received 21 July 2009; revised 20 September 2009; published 4 November 2009

Targetionization and projectile charge changing were investigated for 20–500 keV/uC^q+, O^q++He (q=1–3) collisions. Double- to single-ionization ratios R₂₁ ofhelium associated with no projectile charge change (direct ionization), single-electroncapture, and single-electron loss were measured. The cross-section ratio R₂₁depends strongly on the collision velocity v, the projectile chargestate q, and the outgoing reaction channel. Meanwhile, a modelextended from our previous work [J. X. Shao, X. M.Chen, and B. W. Ding, Phys. Rev. A 75, 012701(2007)] is presented to interpret the above-mentioned dependences. Good agreementis found between the model and the experimental data.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.80.052701
DOI:	10.1103/PhysRevA.80.052701
PACS:	34.50.Fa; 34.80.Dp; 34.70.+e 34.50.Fa Electronic excitation and ionization of atoms 34.80.Dp Atomic excitation and ionization by electron/positron impact 34.70.+e Charge transfer (atoms and molecules) YEAR: 2009
KEYWORDS:	atom-ion collisions, carbon, electron capture, helium neutral atoms, ionisation, oxygen, positive ions

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