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Absolute differential and total cross sections for charge
transfer of O+ with H2
D. R. Sieglaff, B. G. Lindsay, K. A. Smith, and R. F. Stebbings
Phys. Rev. A 59, 3538-3543 (1999)
Absolute differential cross sections (DCSs) are reported for
charge transfer scattering of 0.5-, 0.85-, 1.5-, 2.8-, and 5.0-keV
O+ ions by H2 molecules at angles between
0.04° and 5.4° in the laboratory frame. Cross sections
for O+(4S) ground state and O+(2D,
2P) metastable ions are presented. The ground state
differential cross section is much less forward peaked than is
the metastable differential cross section. Over most of the range
of impact energies studied, the O+(4S)
total cross section is found to be approximately six times smaller
than that for O+(2D, 2P). Based
on the DCS data reported here, a possible explanation for the
large discrepancies in the published ground state total cross
sections is given. The present data confirm the existence of
a minimum in the ground state total cross section at about 2
keV which has been observed by some other workers.
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