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S. Figueira da Silva, Hp. Winter, F. Aumayr:
"Single- and double-electron capture cross sections for slow He²+ impact on O₂, H₂, and D₂";
Physical Review A, 75 (2007), 0427061 - 0427067.

Single- and double-electron capture cross sections have been measured for He2+ impact on O2, H2, and D2
at impact energies smaller than 2 keV/amu. The method applied combines the collection of slow product ions
and electrons with primary ion-beam attenuation and stopping in a differentially pumped target gas chamber.
Comparison with previous experimental and theoretical results is made. For He2+ collisions with H2 we find
that double-electron capture is more important than single-electron capture below 0.2 keV/amu. This result is
also confirmed by cross-section measurements for He2+ on D2.
DOI: 10.1103/PhysRevA.75.042706 PACS number s : 34.50. s, 34.70. e, 39.90. d