Charge transfer of 0.5, 1.5, and 5keV protons with atomic oxygen: Absolute differential and integral cross sections

B. G. Lindsay, D. R. Sieglaff, D. A. Schafer, C. L. Hakes, K. A. Smith and R. F. Stebbings

Phys. Rev. A 53, 212 (1996)

We report measurements of the absolute differential cross sections for charge-transfer scattering of 0.5-, 1.5-, and 5-keV protons by atomic oxygen at scattering angles between 0.01° and 2.6° in the laboratory frame. Absolute integral cross sections are also reported and compared with previously published total cross sections. The measurements were made using a flowing gas target, which consisted of a mixture of atomic and molecu-lar oxygen produced by passage of O₂ through a microwave discharge. The cross sections for atomic oxygen were obtained by appropriate subtraction of the signal due to molecular oxygen from that due to the mixture of O and O₂.